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<title cf:type="text"><![CDATA[Editorial department of the Journal of National University of Defense Technology -->Optical Engineering]]></title>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Coherent Coupling of Optics with Mechanics]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/199804021]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[After describing the principle of coherent Raman phonon occuration, the photo-produced stress distribution in detectors is estimated in some special conditions. A strong shock stress whth duratoin 10ns, amplitude 40.2 Kg/cm<sub>2</sub> may be produced on the surface of detectors, using two commercial YAG dye pulse lasers supplied only with 10KW source. The latent effects of some practical nonideal reasons on the photo-produced stress are analysed and discussed. The realizatoin is also reached that the energy expending of the damage effect resulting from the coherent Raman phonons is less than that of the same effect resulting from thermal effects.]]></description>
<pubDate>2014/1/3 16:01:27</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[Lu Qisheng,Jiang Zhiping and Liu Zejing]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>Lu Qisheng,Jiang Zhiping and Liu Zejing</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/199804021]]></guid><cfi:id>93</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Spectrum of Combustion-driven DF Chemical Lasers]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/199903008]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The output spectrum of the combustion-driven CW DF chemical lasers with different gas flow parameter is measured by the grating scanning method. Compared with the result of numerical calculation, the experimental result is analyzed.]]></description>
<pubDate>2013/11/18 15:33:03</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[Chen Jinbao,Zhao Yijun,Liu Zejin and Shu Bohong]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>Chen Jinbao,Zhao Yijun,Liu Zejin and Shu Bohong</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/199903008]]></guid><cfi:id>92</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Influence of Laser on Abundant-BaCO<sub>3</sub>-YBCO Superconductor]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200003016]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Abundant-BaCO<sub>3</sub>-YBCO superconductor is illuminated by laser(CW-CO<sub>2</sub> laser, CW-YAG and plused-YAG laser). The influence of laser on supconducting critical electric current density Jc is studied.]]></description>
<pubDate>2013/11/18 15:30:59</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[CHENG Xiangai,YU Banmei,CHEN Jingbao,SHU Bohong,AI Jie,DENG Qinghua,HU xin and ZHONG Huihuang]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>CHENG Xiangai,YU Banmei,CHEN Jingbao,SHU Bohong,AI Jie,DENG Qinghua,HU xin and ZHONG Huihuang</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200003016]]></guid><cfi:id>91</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Influence of Abundant BaCO<sub>3</sub> on Properties of YBCO Superconductor]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200003017]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In this paper，we try to change the material composition and renovate preparation technigues in order to improve critical electric current density（Jc）of high temperature superconductor. Based on 10g 123 phase normal proportion，BaCO<sub>3</sub> from 5mg to 10mg are added respectively. AII sampIes are prepared by solid state reaction method. From the superconductor transit temperature（Tc），transit width ΔT，critical electric current density Jc，SEM and XRD chart，we can draw the conclusion that Tc of abundant 123 phase samples is above 90K（ΔT=1～3K）；20mg BaCO<sub>3</sub> is propitious to growth of 123 phase；some abundant BaCO<sub>3</sub> help to improve Jc.]]></description>
<pubDate>2013/11/18 15:30:58</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[CHENG Xiangai,YU Banmei,DENG Qinghua,AI Jie,ZHONG Huihuang and HU xin]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>CHENG Xiangai,YU Banmei,DENG Qinghua,AI Jie,ZHONG Huihuang and HU xin</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200003017]]></guid><cfi:id>90</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Study on a New Type of Strong Pulsed IR Source]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200003018]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[A new approach producing strong pulsed IR is studied theoretically and experimentally. Cylindrically imploding shock waves have been generated by use of strong impulse current making thin copper wires explode. Cylindrically imploding shock waves can make Argon ionized produce plasma and excite strong pulsed IR. The study indicates that strong pulsed IR of MW power and 10μs FWHM can be gained by using this approach.]]></description>
<pubDate>2013/11/18 0:00:00</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[ZHANG Xiaoping,ZHOU Jinjuan,LI Xiangsheng,ZHANG Jiande and LI Chuanlu]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>ZHANG Xiaoping,ZHOU Jinjuan,LI Xiangsheng,ZHANG Jiande and LI Chuanlu</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200003018]]></guid><cfi:id>89</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[The Influence of High Power Microwave on the Critical Current Density J<sub>c</sub> of High T<sub>c</sub> YBCO Superconductor]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200001024]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Three kinds of samples YBCO(123 phase)have been prepared by solid state reaction method. The samples were radiated by high power microwave, then the critical current density J<sub>C</sub> was measured. The experimental results show that proper microwave radiation can improve the critical current density J<sub>C</sub> of samples, samples radiated once in comparison with non-radiated samples, the value of J<sub>C</sub>  increases one order.]]></description>
<pubDate>2013/11/18 0:00:00</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[YU Banmei,CHENG Xiangai,HU Xin,XUE Xiaodong and ZHONG Huihuang]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>YU Banmei,CHENG Xiangai,HU Xin,XUE Xiaodong and ZHONG Huihuang</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200001024]]></guid><cfi:id>88</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[3D Structure from the Aerial Sequential Image Based onFactorization and Bundle Adjustment]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200404010]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[3D structure from aerial image sequence is acquiring much attention in aerial photogrammetry. A novel method based on factorization and bundle adjustment，as well as its principle and implementation is presented. Being the bridge between factorization and bundle adjustment, the notion “R-T”mode based collinearity equation is clarified as well as its linearization equations. Synthetic and real image test show the new method gives an accurate and robust result, and it can be applied to aerial surveying and mapping, virtual reality and military reconnaissance, etc.]]></description>
<pubDate>2013/4/27 3:07:23</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[QIU Zhiqiang,LU Hongwei,ZHANG Xiaohu and YU Qifeng]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>QIU Zhiqiang,LU Hongwei,ZHANG Xiaohu and YU Qifeng</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200404010]]></guid><cfi:id>87</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[The Design of the Vacuum Interface of Spark-05]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200505025]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Spark-05 was built for conducting researches on medium/high impedance high power microwave sources. The interface between oil and vacuum was one of the keys to the system design. For reasons of compactness and simplicity, a disk type vacuum insulator was adapted. Electrostatic field along the insulator surface was calculated. By adjusting the position of the shielding rings, electric fields were well distributed, and the field around the triple junction was controlled. The insulator worked well in 1MV experiments afterwards.]]></description>
<pubDate>2013/4/8 11:10:35</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[YANG Hanwu,WANG Yong,ZHANG Jiande and ZHAO Yansong]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>YANG Hanwu,WANG Yong,ZHANG Jiande and ZHAO Yansong</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200505025]]></guid><cfi:id>86</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[The Reflective Characteristics of the Coaxial Plate-insertedMode Converter]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200505026]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The coaxial plate-inserted mode converter is a novel high-power microwave TEM-TE<sub>11</sub>mode converter. The mode conversion processes of the mode converter were reviewed, and the reflective characteristics were studied by analyzing the waveguide discontinuousness. It is revealed that, the reflection modes of the mode converter are TEM mode and TE<sub>11</sub>mode, the reflection TE<sub>11</sub> mode can be canceled by choosing the right radii of the coaxial waveguide, and the reflection TEM mode can be diminished by setting matching poles and properly designing the cone at the end of inner conductor.]]></description>
<pubDate>2013/4/8 11:10:35</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[YUAN Chengwei<sup>1</sup>,LIU Qingxiang<sup>2</sup> and ZHONG Huihuang<sup>1</sup>]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>YUAN Chengwei<sup>1</sup>,LIU Qingxiang<sup>2</sup> and ZHONG Huihuang<sup>1</sup></atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200505026]]></guid><cfi:id>85</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[All Polarization Maintaining Fiber Magnetic Field SensingSystem with TbDyFe Transducer]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200503007]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[TbDyFe transducer with polarization maintaining fiber (PMF) is produced. An all polarization maintaining fiber M-Z interferometer  is set up. Magnetic field sensing is realized with optical fiber by means of work point controlling method. This system has many advantages such as simple construction and anti-jamming. Especially it has solved the polarization instability. Responses of the system with the change of the DC signal and AC signal amplitude are measured. The smallest AC magnetic field 3×10<sup>-10</sup>T is obtained in  this system.]]></description>
<pubDate>2013/4/8 11:09:48</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[ZHANG Xueliang,NI Ming,MENG Zhou and HU Yongming]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>ZHANG Xueliang,NI Ming,MENG Zhou and HU Yongming</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200503007]]></guid><cfi:id>84</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[On the Theory of Optical Gyro Rotating Inertial Navigation System]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200606016]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Auto-compensating the drift in optical gyros by IMU rotating mechanism is an important way to enhance the navigation precision. The theory of auto-compensating can be clarified in the navigation error propagating functions. Because the attributes of optical gyro determines that rotation of gyro will inevitably bring extra error, the rotaion of the whole IMU is the only mechanism, An eight-180-degree rotating mechanism of IMU was proposed and illustrated in detail. Analyses and simulation show that errors from long term drift can be highly restrained, thus navigation accuracy of both position and attitude can be greatly enhanced.]]></description>
<pubDate>2013/3/14 10:39:54</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[YUAN Baolun and RAO Guyin]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>YUAN Baolun and RAO Guyin</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200606016]]></guid><cfi:id>83</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[A New Method for Moving Target Positioning under theCondition of  Monocular Camera]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200605023]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Accurate estimation of moving target's postion is a very important research area of optical measurement since it has to be performed in many applications. Under the condition that there are no range information of target and known points on the target, such an assumption is made that the target obeys a movement rule is made which adds extra information for target positioning. For moving target positioning under the condition of monocular camera, a new method, collinear equation method, is proposed. The correctness and feasibility of the method are proven by simulation data.]]></description>
<pubDate>2013/3/14 10:39:12</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[ZHANG Xiaohu,DI Hui,ZHOU Jian,SHANG Yang,LI Lichun and YU Qifeng]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>ZHANG Xiaohu,DI Hui,ZHOU Jian,SHANG Yang,LI Lichun and YU Qifeng</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200605023]]></guid><cfi:id>82</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Autocorrelation Based Identification the Blur Extent ofUniform Motion Blurred Images]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200605025]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[For uniform linear motion and uniform rotation blurred images, settling the blur function is the key point in image restoration. The motion direction and blur extent are the important parameters determining the blur function. For the pixels in blurred images have high correlation with the neighbors, the blur extent can be estimated by derivation and correlation methods. The simulation results demonstrate that the algorithm is right, effective and efficient.]]></description>
<pubDate>2013/3/14 10:39:12</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[DI Hui and YU Qifeng]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>DI Hui and YU Qifeng</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200605025]]></guid><cfi:id>81</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Camera Calibration Based on Affine Approximation]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200601025]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Considering the fact that the camera calibration method based on perspective projection model yield intricate and unstable result, a new calibration algorithm based on affine approximation was presented. The affine projection matrix was led out and then some parameters were decomposed. Under the presumption of taking image center as principal point, other parameters were solved. At last, all the parameters' precision was improved on the basis of the cost function of re-projection error. Simulation and real image experiments show that the new method can produce more stable result than the usual one.]]></description>
<pubDate>2013/3/25 4:43:53</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[TANG Litie,QIU Zhiqiang and LU Qisheng]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>TANG Litie,QIU Zhiqiang and LU Qisheng</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200601025]]></guid><cfi:id>80</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Two Dimensional Phase Unwrapping Algorithm Based onPhase Retrieval]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200706007]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[A novel two-dimensional phase unwrapping method is proposed. In this idea, the phase wrapped is propagated through an optical diffraction calculation as an input optical field and transformed into the intensity distribution. Then the phase retrieval algorithm is engaged in order to find the best fitting Zernike polynomials for the unwrapped phase based on the diffraction intensity. Because of the maturity of phase retrieval theory, the uniqueness and accuracy of phase unwrapping can be guaranteed. As a result, the phase noise can be remarkably reduced by intensity filtering. The validity of this algorithm is verified by experiment.]]></description>
<pubDate>2013/2/28 5:09:21</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[HU Xiaojun,ZHENG Ziwen,DAI Yifan and LI Shengyi]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>HU Xiaojun,ZHENG Ziwen,DAI Yifan and LI Shengyi</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200706007]]></guid><cfi:id>79</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Theoretical Comparison of Constant-area Mixing Model and Constant-pressure Mixing Model]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200706008]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The one-dimension mixing model is established from steady state theory, thus the recovery pressures of constant-area mixing model and constant-pressure mixing model are attained. The result implies that the performance of constant-pressure mixing is not always better than that of constant-area mixing, so a criterion is established to estimate the better one of the two mixing models. The consistent conclusion is attained by altering some of the initial parameters in reference.]]></description>
<pubDate>2013/2/28 5:09:21</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[YAN Baozhu,YUAN Shengfu and LU Qisheng]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>YAN Baozhu,YUAN Shengfu and LU Qisheng</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200706008]]></guid><cfi:id>78</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Comparison of Solutions to the Taylor and Agrawal Coupling Modelsfor the Line-plane Transmission-lines]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200705023]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Based on the transmission line approximation, three different equivalent formulations have been proposed for evaluating the interaction between an external electromagnetic field and a transmission line. Moreover, for the line-plane transmission-line, employing the three formulations, C. A. Nucci and F. Rachidi discussed the voltages induced on an overhead line by a nearby lightning strike and, by numerical example, showed that the total induced voltages predicted by these three formulations are identical. This paper, by using an analytic method to discuss the load voltage and current response with the line-plane transmission-line Taylor and Agrawal coupling models, obtained their analytic solutions of the load response for a plane-wave excitation. In the end, it proves that the analytic solutions are equal indeed. In other words, the two coupling formulations are different expressions of the same equations.]]></description>
<pubDate>2013/2/28 5:09:09</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[NI Guyan<sup>1</sup>,LUO Jianshu<sup>1</sup> and LI Chuanlu<sup>2</sup>]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>NI Guyan<sup>1</sup>,LUO Jianshu<sup>1</sup> and LI Chuanlu<sup>2</sup></atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200705023]]></guid><cfi:id>77</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Analysis and Improvement of Timing Control System of MagneticFlux Compression Generator]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200701009]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Timing control system is the important element for Magnetic Flux Compression Generator (MFCG)'s operation. This paper introduced the operating principle of classical timing control system using flat switch along with an analysis of its merits and drawbacks. Then it improved the classical timing control system by means of theoretic and experimental study, and designed a kind of timing control system, which used primacord and solidified coaxial switch. Furthermore, the explosive velocity of primacord and opening time of solidified switch were measured. Finally, the system in the experiment of MFCG was verified.]]></description>
<pubDate>2013/2/28 5:08:14</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[LIU Jianping,MENG Zhipeng,CAO Shengguang and LI Da]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>LIU Jianping,MENG Zhipeng,CAO Shengguang and LI Da</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200701009]]></guid><cfi:id>76</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Numerical Investigation of Fluorine-atom RecombinationModel in CW DF/HF Chemical Laser Nozzle]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200806010]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[As one of the most important components participating in the pumping reaction of CW DF/HF chemical laser, the distribution of fluorine-atom has direct influence on pumping and lasing especially for the cold-reaction operation. Because of free-stream recombination and wall-catalytic recombination, some of the fluorine atoms will be recombined with molecules before entering into the reaction region. It's very important to investigate fluorine-atom' distribution for the analysis and optimization of lasers. Some experimental methods have been developed and theoretical model has been established. The model and general computational fluid dynamics (CFD) tool were combined to compute the fluorine atom distribution. Its validity was tested, and cases under different converge contour were numerically studied.]]></description>
<pubDate>2012/12/7 2:58:05</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[LI Lan,HUA Weihong,YUAN Shengfu and JIANG Zongfu]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>LI Lan,HUA Weihong,YUAN Shengfu and JIANG Zongfu</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200806010]]></guid><cfi:id>75</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[A Research on the Fluid-induced Intense Sound Generator]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200803009]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[For the need of modern intense acoustics technology research, the performance parameters of a hydrodynamic intense sound generator are investigated experimentally. The rules of the influences of the operating pressure, the distance between the reed and nozzle, and the angle of the reed on the SPL(sound pressure level) in the acoustic radiation field are explored and obtained. The results show that, under the optimal circumstance, the SPL in the outlet of the generator can be larger than 140dB.]]></description>
<pubDate>2012/12/7 2:57:23</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[GONG Changchao,ZENG Xinwu,ZHAO Yun and XU Wei]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>GONG Changchao,ZENG Xinwu,ZHAO Yun and XU Wei</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200803009]]></guid><cfi:id>74</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Investigation of Outgassing Characteristic for a High-currentVacuum Diode]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200905027]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Vacuum diodes are among the most important parts of high electron beam accelerators. In order to make vacuum sealing good, outgassing properties of materials for a ceramic insulated diode is investigated. A pumping model including the influence of flow conductance was set up to simulate the material outgassing rate and pump down time. Finally, the outgassing characteristics of materials between normal temperature and heated state are compared in experiment. Results show that heating can efficiently accelerate the outgassing rate and raise the vacuum sealing time.]]></description>
<pubDate>2012/11/8 3:52:03</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[XUN Tao,YANG Hanwu,ZHANG Jiande and WANG Yong]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>XUN Tao,YANG Hanwu,ZHANG Jiande and WANG Yong</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200905027]]></guid><cfi:id>73</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Analysis and Simulation on Phase Closure of Fourier Telescopy]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200901008]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Fourier telescopy is a kind of active imaging technique which has won great attention for these years. In that technique, fringe patterns is used to extract Fourier components of target object, and random phase shift can be eliminated by phase closure, so that high resolution image of the target at geosynchronous ranges can be reconstructed. This paper deduced the basic theory of Fourier telescopy and gave a simulative study on this imaging technique. It showed the validity and feasibility of Fourier telescopy by reconstructing the image of two simulative targets.]]></description>
<pubDate>2012/11/8 3:52:58</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[WANG Xiaowei,LI Quan,WANG Yangui,CHEN Wei and HU Xiaojing]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>WANG Xiaowei,LI Quan,WANG Yangui,CHEN Wei and HU Xiaojing</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200901008]]></guid><cfi:id>72</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[High Power Low Inductance Dummy Load Made of MetalFilm Resistors]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200901009]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[This paper presents a high power low inductance dummy load made of metal film resistors, of which the resistance is 90Ω,and the inductance is ～55nH, nearly without stray capacitance. Cooperated with a capacitive divider, the dummy load has been utilized to measure high voltage pulse with a rise time of several ns for testing a 10-stage wave erection Marx generator. Experimental results verify the high performance of this load, compared with a water resistor load of the same resistance. This high performance is determined by two virtues in the design: one is for using non-capacitance of the metal film resistors and the other is for adopting a structure of impedance tapering line. Power tolerance of the load is evaluated theoretically. In addition, the response ability fed by a square voltage wave is simulated by PSpice software. The dummy load has been tested on the wave erection Marx generator, producing a high voltage pulse with an amplitude of ～210kV, a pulse width of ～40ns and a rise  time of ～5ns, and long term operations show its high reliability and stability.]]></description>
<pubDate>2012/11/8 3:52:58</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[GAO Jingming,LIU Yonggui,YANG Jianhua,ZHOU Xiang and LONG Xiafeng]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>GAO Jingming,LIU Yonggui,YANG Jianhua,ZHOU Xiang and LONG Xiafeng</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/200901009]]></guid><cfi:id>71</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Analysis and Comparative Study of Employing HYLTE and TRIPNozzles in High Power DF Laser]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201006018]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Developing status of combustion driving high power continuous wave Deuterium Fluoride(DF) chemical laser has been briefly presented. Structure parameters of HYLTE (Hypersonic, Low Temperature) nozzle and TRIP nozzle have been comparatively analyzed. Performance difference between the two kinds of nozzles has been summarized. Based on some correlational reported test data, output transverse modes of confocal unstable resonator corresponding to typical gain coefficient distribution along the flow field have been simulated by using numerical method. Considering technical maturity and reliability, we conclude that employing HYLTE nozzle is more appropriate than TRIP nozzle in research and development of high power DF laser concerning the two hard problems: uniformity of beam spot and load of mirrors.]]></description>
<pubDate>2012/8/28 16:33:33</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[YUAN Shengfu,LIU Wenguang,HUA Weihong,YAN Baozhu and LIU Zejin]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>YUAN Shengfu,LIU Wenguang,HUA Weihong,YAN Baozhu and LIU Zejin</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201006018]]></guid><cfi:id>70</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Research and Implementation of Volume Bragg Gratingsfor Beam Combination]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201002029]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The paper proposes a new approach of beam combination, in which the feasibility of volume Bragg gratings as the laser beam guiding device was analyzed. Based on Kogelnik's theory of coupled waves, the wavelength selectivity and angular selectivity of volume Bragg gratings were emphatically discussed. The experimental fabricating process was reported in detail. Two different wavelength lasers beam combination and two same wavelength lasers beam combination were performed. As a result, the feasibility of Bragg grating for beam combination was verified. In order to be used conveniently in practical operation, the special angle is taken into account. The optical path will be improved and the theoretic calculation also be simplified. The beam combination efficiency will be greatly improved.]]></description>
<pubDate>2012/9/19 9:01:24</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[LIU Li<sup>1,2</sup>,TAN Jichun<sup>3</sup>,ZHENG Guangwei<sup>1</sup>,HE Yanlan<sup>3</sup>,ZHENG Haobin<sup>3</sup>,RUAN Yi<sup>1</sup> and LIU Yixing<sup>3</sup>]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>LIU Li<sup>1,2</sup>,TAN Jichun<sup>3</sup>,ZHENG Guangwei<sup>1</sup>,HE Yanlan<sup>3</sup>,ZHENG Haobin<sup>3</sup>,RUAN Yi<sup>1</sup> and LIU Yixing<sup>3</sup></atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201002029]]></guid><cfi:id>69</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Research on Small Delay Signal Processor Method of MechanicalDithered Ring Laser Gyro]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201002030]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Dither signal removal is the important work of mechanical dithered ring laser gyro (MDRLG) signal processor. In view of the limitation of present dither signal removal method in fast tracking use, a new method combining dither stripper with FIR filter is proposed in this paper. Results show that the dither signal in gyro count can be attenuated about 75dB after dither stripper, which can be used in the situation that real time angular rate output is needed. The residual dither signal and high frequency noise can be removed by FIR low pass filter，then the performance is improved under the condition of short time delay.]]></description>
<pubDate>2012/9/19 9:01:24</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[ZHANG Qinghua,HU Shaomin and LONG Xingwu]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>ZHANG Qinghua,HU Shaomin and LONG Xingwu</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201002030]]></guid><cfi:id>68</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Studies of Chemiluminescence Spectrum in the Optical Cavity of HF Chemical Laser]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201106020]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Chemiluminescence is an important method of measuring parameter in optical cavity flow field for HF/DF chemical laser. In the process of increasing H<sub>2</sub> flow rate, the changing of the chemiluminescence in visible range in the optical cavity flow field of discharge driven HF laser was observed and recorded, and the spectrum of the chemiluminescence on the optic axis was measured. The component particle of the gas in the optical cavity was analyzed theoretically, and the high order overtone spectral line of HF molecule was computed. It was found that the spectral line of the transition from 3 order vibration excited state to ground state was in infrared region. The measured spectrum of the chemiluminescence and the spectral line of the particle was compared, discovering that the yellow-green chemiluminescence was formed by the radiation of the excited F, He, H, N, HF and other particle, which corrected the explanation in some classic literature that the yellow-green chemiluminescence was formed by the 3,4,5 order overtone radiation of HF molecule. This further explains the color forming of the chemiluminescence on the optic axis.]]></description>
<pubDate>2012/9/12 11:15:11</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[LUO Wei,YUAN Shengfu,YAN Baozhu and LU Qisheng]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>LUO Wei,YUAN Shengfu,YAN Baozhu and LU Qisheng</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201106020]]></guid><cfi:id>67</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Parallelization of MSPH Simulating the Temperature Field of Resin Composite Irradiated by Laser]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201106021]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The modified smoothed particle hydrodynamics method (MSPH) has obvious advantages on simulating the radiation effects of resin composite irradiated by laser, but the serial computation is difficult to meet the demand. In order to improve the computational efficiency of the serial MSPH program, the parallelization of the serial program was carried out by using the message passing interface (MPI) standard. The parallel computing results were compared with the serial computing results given by a personal computer, and the performances of the parallel program involving speed-up and efficiency are tested on a 5 teraflop computer cluster. Numerical calculations show that the parallel computing results are consistent with the serial computing results, thus obtaining a very good parallel performance. Therefore, the parallelization based on MPI is successful.]]></description>
<pubDate>2012/9/12 11:15:11</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[CHEN Minsun,JIANG Houman and LIU Zejin]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>CHEN Minsun,JIANG Houman and LIU Zejin</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201106021]]></guid><cfi:id>66</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Optimization Calibration of Multi-camera Relay Station in the Videometric Using Camera Network]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201105009]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Multi-camera relay station is usually used to relay pose parameters among neighboring nodes in the videometric using camera network. An optimization method based redundancy calibration is proposed to solve the problem. Firstly, the number of independent pose parameters, the maximum number of measurable pose parameters and the minimum number of restricted condition were analyzed for a normal multi-camera relay station. Then, the optimized calibrating algorithm for a typical four-camera relay station was given，and the optimized method for general relay station calibration was suggested as well. Finally, a numerical simulation of the proposed algorithm for four-camera relay station calibration was conducted. The results show that the algorithm is feasible and effective.]]></description>
<pubDate>2012/8/28 11:51:54</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[CHAO Zhichao<sup>1</sup>,JIANG Guangwen<sup>1</sup>,FU Sihua<sup>1</sup> and YU Qifeng<sup>2</sup>]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>CHAO Zhichao<sup>1</sup>,JIANG Guangwen<sup>1</sup>,FU Sihua<sup>1</sup> and YU Qifeng<sup>2</sup></atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201105009]]></guid><cfi:id>65</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Design and Preparation of Bionic Camouflage Materials by Simulating Plant Leaves]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201105010]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[A novel bionic camouflage material, which is constituted of transparent poly（vinyl chloride） surface, chlorophyll/poly(vinyl alcohol) film, high-vapor-barrier water bag and paper, was designed and prepared by simulating plant leaves. The transparent poly（vinyl chloride） surface was used to provide waterproof capability of the camouflage material; the chlorophyll was concealed into the high-oxygen-barrier poly(vinyl alcohol) film to improve its photostability; the water was sealed into the bag of high-vapor-barrier poly(vinylidene chloride) to prevent its vaporization loss; and the paper was used to simulate the spongy mesophyll of plant leaf organs. The result of spectral tests showed that the reflectance spectra of camouflage material and plant leaves, whose similarity was 0.9983, exhibited the same characteristics in visible, near infrared and short wave infrared wave bands, and the spectral characteristics of camouflage material did not change after three months’ sunlight treatment. The bionic camouflage material, which displayed a high spectral similarity with plant leaves and a good weather resistance, is an effective method to take on reconnaissance of hyperspectral imaging hopefully.]]></description>
<pubDate>2012/8/28 11:51:54</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[YANG Yujie,HU Biru and WU Wenjian]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>YANG Yujie,HU Biru and WU Wenjian</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201105010]]></guid><cfi:id>64</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Studies on the Hole Inflation and Tapering Techniques of  Photonic Crystal Fibers]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201102001]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Hole inflation and tapering techniques have been rated effective methods to change the structure parameters of the photonic crystal fibers (PCFs). Hole inflation can change the air-filling faction, that is, the hole diameter and pitch of the PCFs and tapering can change the core diameter while preserving the cross section of the original PCFs. Controllable-change of the structure parameters of the PCFs allows some special PCF devices to be made,and is of great significance to further realize the potential applications of PCFs.]]></description>
<pubDate>2012/8/28 10:30:13</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[CHEN Zilun<sup>1</sup>,XI Xiaoming<sup>1</sup>,SUN Guilin<sup>1,2</sup>,Xu Zhongnan<sup>1</sup>,HOU Jing<sup>1</sup> and JIANG Zongfu<sup>1</sup>]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>CHEN Zilun<sup>1</sup>,XI Xiaoming<sup>1</sup>,SUN Guilin<sup>1,2</sup>,Xu Zhongnan<sup>1</sup>,HOU Jing<sup>1</sup> and JIANG Zongfu<sup>1</sup></atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201102001]]></guid><cfi:id>63</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Effects of Material Dispersion on Dispersion in Bandgaps of All-Solid Photonic Bandgap Fibers]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201102002]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[All-solid photonic bandgap fibers have being used for supercontinuum generation. The spectral rang of supercontinuum is controllable with the use of bandgap. But the dispersion has significant effect on supercontinuum generation. In different bandgaps of the same photonic bandgap fiber and in the same order bandgaps of different photonic bandgap fibers, the group velocity dispersions were calculated with plane-wave methods. The results indicate that the relative position of the zero dispersion wavelength in the bandgap strongly depends on the location of the corresponding bandgap. Zero dispersion wavelength is in the proximity of the short wavelength edge of bandgap in long wavelength region.However, it is located near the long wavelength edge of bandgap in short wavelength region. From the calculated waveguide dispersion and material dispersion, it can be found that it is material dispersion that affects the relative position of zero dispersion wavelength in bandgap.]]></description>
<pubDate>2012/8/28 10:30:13</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[ZHANG Bin,HOU Jing and JIANG Zongfu]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>ZHANG Bin,HOU Jing and JIANG Zongfu</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201102002]]></guid><cfi:id>62</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[The Experimental Research of Temperature Rise of the Fore andAfter Surface of the Chip of Photovoltaic HgCdTe Detector Irradiatedby Spectral Unrelated Laser]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201102003]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[To study temperature variation of the detector chip irradiated by spectral unrelated laser, the platinum resistance thermometer is used to monitor temperature of the chip's back surface. The electron-hole pairs separative duty of the field in the junction depletion region is calibrated. The temperature of front chip surface is obtained by the experimental method of laser combination. It is found that both front and back chip surface have temperature rise, but the temperature of back chip surface is always higher than that of the front one in the irradiated process.]]></description>
<pubDate>2012/8/28 10:30:13</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[JIANG Tian<sup>1,2</sup>,CHENG Xiangai<sup>1</sup>,LI Li<sup>1</sup>,ZHENG Xin<sup>1</sup>,JIANG Houman<sup>1</sup>,LU Qisheng<sup>1</sup>,TIAN Hong<sup>3</sup> and BIAN Jing<sup>3</sup>]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>JIANG Tian<sup>1,2</sup>,CHENG Xiangai<sup>1</sup>,LI Li<sup>1</sup>,ZHENG Xin<sup>1</sup>,JIANG Houman<sup>1</sup>,LU Qisheng<sup>1</sup>,TIAN Hong<sup>3</sup> and BIAN Jing<sup>3</sup></atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201102003]]></guid><cfi:id>61</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Experimental Study of Discharge Tube Diameter Optimize forDischarge Driven HF/DF Chemical Laser]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201102004]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Reducing the diameter of the discharge tube used in the discharge driven HF/DF chemical laser is useful for integration of multi- module, and may be useful for promoting the performance of the laser as well. The glow discharge characteristics and laser operated parameters of three different discharge tubes were experimental studied, and the diameter of the discharge tubes was 28mm, 20mm and 16mm, respectively. When NF<sub>3</sub>gas was injected, the plasma necking phenomenon occurred in all three discharge tubes. For the laser which  used the 20mm diameter discharge tube, the plasma necking phenomenon was the weakest, the total consume of working gas was the least, the output power and the  electro-optic transfer efficiency were the highest, and the laser output power promotion effect by secondary He was the most outstanding. Through comparison, it is suggested that the stability and volume of the plasma are two intuitionistic parameters for judging the performance of discharge tubes.]]></description>
<pubDate>2012/8/28 10:30:13</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[LUO Wei,YUAN Shengfu,LU Qisheng and YAN Baozhu]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>LUO Wei,YUAN Shengfu,LU Qisheng and YAN Baozhu</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201102004]]></guid><cfi:id>60</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Flash Lump Pumped Q-switched Domestic Nd:YAG Ceramic Laser]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201102005]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Ceramic laser, possessing the advantage of polycrystalline inhesion, has the potential to be high-energy and high-light beam quality laser. The current study researched into the performance of domestic Nd:YAG  ceramic created by Shanghai institute of ceramics and realized the actively and passively Q-switched ceramic laser side-pumped by flash lamps. The average pulse energy could be above 100mJ and the repeat rate is up to 20Hz. The peak power reaches nearly 10 MW. The research result in the confirmation of ceramic laser in the field of high-energy laser, and a probe in the short pulse ceramic laser with high energy.]]></description>
<pubDate>2012/8/28 10:30:13</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[LI Xiao<sup>1</sup>,YANG Zining<sup>1</sup>,LIU Liang<sup>1</sup>,GUO Shaofeng<sup>1</sup>,XU Xiaojun<sup>1</sup>,ZHAO Yijun<sup>1</sup>,LIU Wenbing<sup>2</sup>,JIANG Benxue<sup>2</sup> and PAN Yubo<sup>2</sup>]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>LI Xiao<sup>1</sup>,YANG Zining<sup>1</sup>,LIU Liang<sup>1</sup>,GUO Shaofeng<sup>1</sup>,XU Xiaojun<sup>1</sup>,ZHAO Yijun<sup>1</sup>,LIU Wenbing<sup>2</sup>,JIANG Benxue<sup>2</sup> and PAN Yubo<sup>2</sup></atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201102005]]></guid><cfi:id>59</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Lasing Experiments of HF Laser in Different Background Pressure]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201102006]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In order to study the effect of background pressure on the output performance of HF laser, and to provide referenced data for the              “Base-ejecting” HF chemical laser, a series of experiments were conducted with different background pressure for a certain HF laser. From them, the output power and faculae were obtained. The results reveal that, the upper limit of background pressure for lasing is 4 kPa. In addition, the dependence of lasing with  diffusional mixing on the cavity pressure is deep, on the other hand, lasing will be generated in high background pressure with injection mixing.]]></description>
<pubDate>2012/8/28 10:30:13</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[YAN Baozhu,YUAN Shengfu,LU Qisheng,LI Lan and JIN Donghuan]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>YAN Baozhu,YUAN Shengfu,LU Qisheng,LI Lan and JIN Donghuan</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201102006]]></guid><cfi:id>58</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Influence of Tangential Airflow on Laser IrradiatingCarbon-Fiber Composite]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201102007]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The experiment of 975nm continuous wave laser irradiating carbon-fiber reinforced resin composite was studied, while the front surface of the target was provided with and without tangential airflow. Analysis indicates that the loading of tangential airflow can enhance the damage effect of laser on carbon-fiber composite. The failure mechanism of carbon-fiber composite irradiated by laser is preliminarily studied in theory. Based on the oxidation characteristics and the oxidation reaction mechanism of carbon, the oxidation rate equation of carbon-fiber was obtained. The three-dimensional temperature field model of thermally decomposing resin composite irradiated by laser was solved using modified smoothed particle hydrodynamics, the failure mechanism of carbon-fiber composite irradiated by laser was numerical simulated. Simulation results proved to be consistent with experimental results.]]></description>
<pubDate>2012/8/28 10:30:13</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[CHEN Minsun,JIANG Houman and LIU Zejin]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>CHEN Minsun,JIANG Houman and LIU Zejin</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201102007]]></guid><cfi:id>57</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Influence of Optical Path Difference on CombinationEffect in Multi-wavelength Active Coherent Beam Combination]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201102008]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In order to make a theoretical description of the multi-wavelength active coherent beam combination(CBC), and to figure out the significant factors influencing the combination effect, a mathematical model was established based upon the fundamentals of CBC. The combination effect of each frequency component and the whole combination effect are obtained on the calculation of the nine-wavelength seven-channel CBC example with various optical path differences. Only the central frequency component is coherently enhanced and the whole combination effect degenerates to non-coherent beam combination on the condition of large optical path difference. More components are coherently enhanced and the whole combination effect is improved when the optical path difference is small. The optical path difference is the key in multi-wavelength active CBC. To achieve excellent combination effect, the optical path difference should be adjusted to the same and then the phase of each channel is locked.]]></description>
<pubDate>2012/8/28 10:30:14</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[HAN Kai,XU Xiaojun,ZHOU Pu,MA Yanxing and WANG Xiaolin]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>HAN Kai,XU Xiaojun,ZHOU Pu,MA Yanxing and WANG Xiaolin</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201102008]]></guid><cfi:id>56</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Research on Calibration Method for Dither RLGs Inertial  Measurement Unit with Shock Absorbers]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201102009]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Because of the deformation of shock absorbers, the  dither RLGs inertial measurement unit (IMU) can not be calibrated using a precise turntable as attitude reference.This paper introduces a new calibration method for dither RLGs IMU,firstly, the RLGs were turned off and the IMU without absorbers was fastened on a precise turntable to calibrate the error parameters of accelerometers;then the shock absorbers were installed on IMU,paper designed a procedure for the calibration of RLGs error parameters. Further more,according to the output error equation of the RLGs, a systematic calibration algorithm of the RLGs IMU was proposed based on a 21 dimensional kalman filter using velocity errors as measurement vector.The simulation results indicate that the novel calibration method can accurately identify RLGs scale factor errors,drifts, misalignments errors and accelerometers drifts, and the accuracy of this method satisfy the requirements of high precision inertial navigation system.]]></description>
<pubDate>2012/8/28 10:30:14</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[WU Saicheng,QIN Shiqiao,WANG Xingshu and HU Chunsheng]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>WU Saicheng,QIN Shiqiao,WANG Xingshu and HU Chunsheng</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201102009]]></guid><cfi:id>55</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Numerical Study of Compositions Proportioning in Combustor of HF Chemical Laser]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201102010]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Chemical equilibrium compositions, total temperature and total pressure of HF chemical laser combustor for NF<sub>3</sub>-D<sub>2</sub>-He reaction system were calculated by combining minimum Gibbs' free energy method and mass  flux conservation principle. Mole flux of F atom as a new parameter that can be used to express yield of F atom was presented. The effect of changing fuels' mass flow rates on combustor's characteristics was analyzed with emphasis. When the compositions proportion in combustor was maintained constant, increasing of mass flow rate of F atom and total pressure of combustor was in proportion to the  increasing of total mass flow rate. Changing of total pressure had no obvious impact on adiabatic flame temperature, degree of F<sub>2</sub> dissociation, and mole fraction of F atom. The changing of mass flow rates of NF<sub>3</sub> or D<sub>2</sub> was able to adjust the oxidizer excess factor. In comparison with changing mass flow rate of D<sub>2</sub>, changing mass flow rate of NF<sub>3</sub> could acquire much higher mole fraction and mole flux of F atom, much smaller fluctuating amplitude of combustor's total pressure. Increasing mass flow rate of He decreased adiabatic flame temperature and mole fraction of F atom observably. Whereas degree of F<sub>2</sub> dissociation and mole flux of F atom maintained a high level still when primary diluent ratio was  less than 15.]]></description>
<pubDate>2012/8/28 10:30:14</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[JIN Donghuan,LIU Wenguang,CHEN Xing and LU Qisheng]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>JIN Donghuan,LIU Wenguang,CHEN Xing and LU Qisheng</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201102010]]></guid><cfi:id>54</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Numerical Investigation of Comparing Annular with Linear Distribution Flow Pipeline in Chemical Laser]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201101009]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Distribution flow pipeline used in cylindrical chemical laser is composed of an annular general pipeline and a limited quantity of 
branch pipelines that are connected with the inner or outer circular arc of general pipeline. Its structure and flow field characteristics differ from those of linear distribution flow pipeline used in conventional chemical laser. Flow field characteristics of above-mentioned three kinds of distribution flow pipelines were analyzed contrastively based on three-dimension computational fluid dynamics methods. The numerical simulation results demonstrate that total pressure of general pipeline in linear distribution flow pipeline is higher than that in outer-circular-arc annular pipeline, but lower than that in inner-circular-arc annular pipeline. Both distribution flows of branch pipelines and secondary flows produced in annular general pipeline can excite radial velocity on the section plane of general pipeline. These phenomena enable the gas flow of general pipeline to have remarkable three-dimension characteristics. Mass flow rates of branch pipeline outlets are higher and higher along the direction of main gas flow movement. Its trend is contrary to upward tendency of total pressure in general pipeline, but is similar to downward tendency of static pressure in general pipeline. By comparison, Mass flow rate fluctuating amplitude of branch pipeline outlets in outer-circular-arc annular distribution flow pipeline is smaller than that in linear distribution flow pipeline, and the amplitude in inner-circular-arc annular distribution flow pipeline is the biggest of the three. As a result, outer-circular-arc annular distribution flow pipeline is of advantage among the three methods in distributing uniformly gas flow, while inner-circular-arc annular pipeline is the lowest and the linear distribution flow pipeline goes between the other two.]]></description>
<pubDate>2012/8/29 10:50:39</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[JIN Donghuan,LIU Wenguang,CHEN Xing,LU Qisheng and ZHAO Yijun]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>JIN Donghuan,LIU Wenguang,CHEN Xing,LU Qisheng and ZHAO Yijun</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201101009]]></guid><cfi:id>53</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Active Disturbance Rejection Control of Remotely OperatedWeapon Station]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201101010]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The remotely-operated weapon station (ROWS) is a non-linear system with strong backlash, time-varying friction and time-varying moment of inertia. The active disturbance rejection controller (ADRC) was designed to improve the system's performance. Based on ADRC extended state observer to estimate the model uncertainty and external interference of the system, the system's ability of disturbance rejection was greatly improved. Experiment result 
shows that the system used ADRC technique has good dynamic performance. It takes only 2.62s for a 180° maneuver with no overshoot and no chattering.]]></description>
<pubDate>2012/8/29 10:50:39</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[ZHANG Wei,CHEN Yuzhong and HU Yongming]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>ZHANG Wei,CHEN Yuzhong and HU Yongming</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201101010]]></guid><cfi:id>52</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Optics based real-time tracking and measuring system for 
the underwater mining-task-machine trajectory]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201206022]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Mining-Task-Machine is the key technology of the Ocean Mining System. To finalize the design，It is the key step to test the traction and control unit of the Mining-Task-Machine by measuring kinematic parameters with high precision. Mining-Task-Machine moves in a large area in water, a binocular measurement method with wide-angle lens is used to make real-time track and measurement of the trajectory of Mining-Task-Machine. Firstly, the lens distortion is calibrated by using gridding board in lab. Secondly, according to the natural feature, the parameters of the lens distortion is modified based on the result in lab and all the camera parameters are calibrated. Finally, the binocular system tracks a cooperative feature on Mining-Task-Machine and measures the motion trajectory including position and velocity, etc. of it on real time. The residual between the result of the system and the total station is about 5 mm. The system has passed the examination and evaluation, and has been put into use.]]></description>
<pubDate>2013/1/11 4:19:31</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[ZHOU Jian<sup>1,2</sup>,HAI Yulin<sup>3</sup>,SUN Xiangyi<sup>1</sup> and ZHANG Xiaohu<sup>1</sup>]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>ZHOU Jian<sup>1,2</sup>,HAI Yulin<sup>3</sup>,SUN Xiangyi<sup>1</sup> and ZHANG Xiaohu<sup>1</sup></atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201206022]]></guid><cfi:id>51</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Dim changing target detection of outside stereo scene 
for airborne platform]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201206023]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[We present a new method to detect the dim changing target for the image sequence of outside stereo scene obtained from the airborne camera. In order to compensate for the movement of the platform, a cascading image registration mode is proposed, which firstly uses the biological vision method to register the images to be detected coarsely and fast, and which then uses least square match based on invariant coefficient to register the images accurately. In order to compensate for the gray-scale changes between the images, a new histogram similarity transformation is proposed, which is ?able to handle not only linear gray-scale changes but also nonlinear gray-scale changes. In order to reduce the stereo effect, a sub-region division method is proposed, which divides an image into several sub-regions, and then calculates the affine transformation parameters for each corresponding sub-regions independently. Using this scheme, we can make sure that different sub-regions correspond to different geometric transformation parameters. Experimental results using many real images obtained from electro-optic pods clearly demonstrate the correctness and validity of the method.]]></description>
<pubDate>2013/1/11 4:19:31</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[LIU Xiaochun<sup>1,2</sup>,YU Qifeng<sup>1,2</sup>,LEI Zhihui<sup>1,2</sup> and HOU Wang<sup>1,2</sup>]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>LIU Xiaochun<sup>1,2</sup>,YU Qifeng<sup>1,2</sup>,LEI Zhihui<sup>1,2</sup> and HOU Wang<sup>1,2</sup></atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201206023]]></guid><cfi:id>50</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Experimental study of the focusing property of underwater pulsed discharge shock wave]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201204011]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Shock wave focusing can produce higher pressure in the focal region. An underwater shock wave focusing system was set up based on the pulsed discharge in water and the focusing characteristics of ellipsoidal reflector. The focusing of shock wave was studied experimentally; the focusing process of shock wave was analyzed. The pressure-time history and the peak pressure along the axial position were presented, the distributing characteristics of the focusing shock wave were revealed. Negative pressure and cavitation phenomenon was induced by shock wave focusing, and the phenomenon was analyzed based on shock dynamic theory. The experimental results indicate that the focusing effect of the ellipsoidal reflector is remarkable.]]></description>
<pubDate>2012/9/12 9:00:49</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[ZHANG Zhenfu<sup>1</sup>,ZENG Xinwu<sup>2</sup>,WANG Yibo<sup>2</sup> and CAI Qingyu<sup>2</sup>]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>ZHANG Zhenfu<sup>1</sup>,ZENG Xinwu<sup>2</sup>,WANG Yibo<sup>2</sup> and CAI Qingyu<sup>2</sup></atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201204011]]></guid><cfi:id>49</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Effect of mismatched spacing and angle on zero-dispersion femtosecond pulse shaping system]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201202032]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In order to study the effect of mismatched spacing and angle of zero-dispersion femtosecond pulse shaping system on the temporal properties of the output femtosecond pulses, the relation between the resolution and the mismatched spacing of the system was analyzed in theory. And then the effect of mismatched spacing and angle on the system efficiency and the width of the output pulses were discussed. The experimental results indicated that lens misalignment can broaden the pulse, and the influences of the first and the second gratings are symmetrical. Moreover, the influence on system efficiency of angle misalignment was more serious than spacing misalignment. If 600 lines per millimeter grating and lens of 30 centimeter focal length were used, when the angle misalignment was smaller than 9°and spacing misalignment was shorter than 0.5 centimeters, the changing of system efficiency and pulse width were both smaller than 5%. All the results above are helpful to an in-depth study on the zero-dispersion pulse shaping system.]]></description>
<pubDate>2012/8/28 10:27:55</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[NIE Yongming,LI Xiujian,QI Junli,YANG Jiankun,LIAO Jiali,HU Wenhua and LUO Shishang]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>NIE Yongming,LI Xiujian,QI Junli,YANG Jiankun,LIAO Jiali,HU Wenhua and LUO Shishang</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201202032]]></guid><cfi:id>48</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Picosecond laser pumped high power supercontinuum source]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201201001]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[A picosecond fiber laser was applied for high power supercontinuum generation (SCG) in photonic crystal fiber (PCF), the key technical issues of fabricating high power all fiber supercontinuum sources were considered and the advantages and disadvantages of picosecond fiber lasers in several configurations for SCG in PCF were analyzed. By using a repetition rate increasing system, a high power picosecond fiber laser suitable for SCG was constructed. By enlarging the core of the PCF at the input end through post-processing method, low splicing loss was realized between the double cladding fiber and the PCF. 35.6 W supercontinuum output is realized with spectrum covering the wavelength range from 650 nm to 1700 nm.]]></description>
<pubDate>2012/8/27 9:46:17</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[CHEN Shengping,CHEN Hongwei,WANG Jianhua,CHEN Zilun,HOU Jing,XU Xiaojun,CHEN Jinbao and LIU Zejin]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>CHEN Shengping,CHEN Hongwei,WANG Jianhua,CHEN Zilun,HOU Jing,XU Xiaojun,CHEN Jinbao and LIU Zejin</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201201001]]></guid><cfi:id>47</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[A physical model and simulation of the interference fringesfor the aligment of unstable resonator]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201201002]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The physical model of multiple beams interference fringes was established for unstable resonator alignment, and the characteristics of interference fringes with different misalignment angles were calculated by a homemade software, in which augmented matrices of misaligned optical systems was applied to compute the decentration and tilt of Gaussian beams. The ABCD law was applied to calculate the multi-pass propagation of Gaussian beam q parameter. Furthermore, the interference fringe for unstable resonator alignment was calculated by adding the complex electrical field of multiple Gaussian beams. The calculated interference fringe was found to fit well with the experimental results, which shows that the physical model is correct. Therefore, this model can quantitatively explain the relation between the characteristics of interference fringes and the misalignment of the resonator, and then can be a theoretical guidance for compute-aided automatic alignment of the resonators. ]]></description>
<pubDate>2012/8/27 9:46:17</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[LIU Wenguang and QIU Weicheng]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>LIU Wenguang and QIU Weicheng</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201201002]]></guid><cfi:id>46</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Influence of nonuniform intensity on curvature adaptive optics system]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201201003]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[With Gaussian intensity distribution or normal random intensity distribution, the correction of Zernike aberrations by a 37-element curvature adaptive optics system was simulated, and compared to the correction with uniform intensity distribution. In the case of Gaussian intensity distribution, the nonuniform of intensity brings about some influence into the correction of Zernike aberrations. The influence on Zernike aberrations with non-zero curvature is more serious than that to Zernike aberrations with zero curvature. In the case of normal random intensity distribution, the influence on Zernike aberrations is small. The correction of Zernike aberrations with zero curvature is more accurate than that for the non-zero curvature aberrations. The results indicate that the 37-element curvature adaptive optics system can correct low order Zernike aberrations when the nonuniform intensity is not very serious.]]></description>
<pubDate>2012/8/27 9:46:17</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[HUANG Shengyang,XI Fengjie,NING Yu,LIU Changhai and JIANG Zongfu]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>HUANG Shengyang,XI Fengjie,NING Yu,LIU Changhai and JIANG Zongfu</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201201003]]></guid><cfi:id>45</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[In-field stray light distribution  caused by  the surfacescattering in ritchey-chretien systems]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201201004]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The analytic expressions for the scattered distributions at the focal plane of the Ritchey-Chretien reflective system (R-C system) from the primary mirror and the second mirror were derived. Aiming at the scattered distribution in a typical R-C system, the excellent agreement of the computing results according to the formula introduced in this study with the simulating results provided by the commercial optical analysis software shows that the formula derived is believable and reasonable. Compared with the diffracted distribution at the focal plane, it is more convenient to analyze the saturated effects at the focal plane of the system irradiated by intense light. The results indicate that in the typical R-C system, diffraction is the dominant factor of the saturating effect inside 2.5mm, while surface scattering saturates the detector outside this range. This result provides a theoretical basis for the further study of intense light induced saturating effects in optical system.     ]]></description>
<pubDate>2012/8/27 9:46:17</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[SUN Ke,JIANG Houman and CHENG Xiangai]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>SUN Ke,JIANG Houman and CHENG Xiangai</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201201004]]></guid><cfi:id>44</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Analysis of the effects of MgSO<sub>4</sub>relaxation on the propagation of underwater intensive acoustic pulse]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201201005]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Based on the spectrum analysis of the experimental intensive acoustic pulse waveform using FFT, the current research found that the dominating energy of the spectrum is below 100 kHz. It is well known that one of the chemical compositions in sea water, MgSO<sub>4</sub>, will cause excessive absorption of acoustic energy due to its chemical relaxation. Starting from a modified equation of state, with special consideration of the relaxation absorption of MgSO<sub>4</sub> in seawater, a new wave propagation equation of intensive acoustic pulse was deduced. Combined with the numerical algorithm, the propagation process of the pulse was simulated and the effects of MgSO<sub>4</sub> relaxation on waveform and spectrum were analyzed. The results indicate that relaxation process will flatten and smooth the steep pulse waveform, and reduce the acoustic energy to low frequency end. The chemical relaxation effects will cause extra loss of the pulse energy, in addition to the geometric spreading effects of pulse wavefront. ]]></description>
<pubDate>2012/8/27 9:46:17</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[ZHANG Jun,ZENG Xinwu,WANG Yibo and CHEN Dan]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>ZHANG Jun,ZENG Xinwu,WANG Yibo and CHEN Dan</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201201005]]></guid><cfi:id>43</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Mutual injection-locking of two Nd:YAG lasers]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201201006]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Coherent beam combining (CBC), used in scaling power by phase-locking multi-lasers, is an efficient approach to achieve high brightness laser. Based on this approach, the current study analyzed the mechanism of mutual injection-locking and its influence to the laser coherence. Furthermore, two independent Nd:YAG lasers were associated with each other by polarized elements, achieving the mutual-injection-locking of two lasers. Coherent laser power reached 4.4W and the peak intensity rosed up to 1.4 factor. Thus , this research made an tentative exploration of the high power coherent beam combining laser.]]></description>
<pubDate>2012/8/27 9:46:17</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[LI Xiao,CAO Jianqiu,ZHOU Pu,CHEN Zilun,XU Xiaojun and ZHAO Yijun]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>LI Xiao,CAO Jianqiu,ZHOU Pu,CHEN Zilun,XU Xiaojun and ZHAO Yijun</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201201006]]></guid><cfi:id>42</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Analysis of the relationships between system damage effect and the uplink telescope aperture in a relay mirror system]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201201007]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Model of a relay mirror system was established, and the relationships between system damage effect and the uplink telescope aperture in a 30km-altitude relay mirror system were calculated. Results show that, with the increase of the uplink telescope aperture, the system damage effect increases significantly when the uplink telescope aperture is less than 0.42m; the system damage effect decreases sharply when the uplink telescope aperture is in 0.42-0.54m; the system damage effect increases when the uplink telescope aperture is greater than 0.54m，while gradient of the increasing reduces; the system damage effect tends to be a stable value when the telescope aperture is greater than a certain size. Reasons for the steep fall in 0.42-0.54m are analyzed, and it is demonstrated that the intensity non-uniformity of the received beam causes the reduction of the new source beam quality and the steep fall of the system damage effect. The results of the study can provide reference for the relay mirror system.]]></description>
<pubDate>2012/8/27 9:46:17</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[WU Huiyun,WU Wuming,XU Xiaojun,CHEN Jinbao and ZHAO Yijun]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>WU Huiyun,WU Wuming,XU Xiaojun,CHEN Jinbao and ZHAO Yijun</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201201007]]></guid><cfi:id>41</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Investigation of coherent beam combining pulsed fiber lasers with active phase control]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201201008]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[A scalable architecture for coherent combining of pulsed lasers with active phase control using stochastic parallel gradient descent (SPGD) algorithm is proposed and demonstrated. A low-pass filter is introduced to eliminate the fluctuation of the metric function caused by pulsed lasers and extract the exact phase noise signal, and an active control is thereby built with SPGD algorithm and stable coherent beam combining can be obtained at the receiving plane. Theoretical analysis and numerical simulation were made and an experiment of coherent beam combining two-channel pulsed fiber lasers was also conducted. Experiment results shows that the power encircled in the main-lobe is 1.6 times increased and the fringe visibility of the long exposure pattern is increased from 0 to 0.43 when the system evolves from open-loop to closed-loop. This architecture can be easily scaled up to high power by increasing the number of channel for coherent combining and adding power amplifiers in each channel. ]]></description>
<pubDate>2012/8/27 9:46:17</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[WANG Xiaolin,ZHOU Pu,MA Yanxing,MA Haotong,LI Xiao,XU Xiaojun and ZHAO Yijun]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>WANG Xiaolin,ZHOU Pu,MA Yanxing,MA Haotong,LI Xiao,XU Xiaojun and ZHAO Yijun</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201201008]]></guid><cfi:id>40</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[The key technologies in coherent beam combination of high power fiber laser]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201201009]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Coherent beam combination of fiber laser/amplifiers is believed to be a promising way to acquire the high power and beam quality laser. Some key technologies are studied in this paper, including dithering phase-locking technology, laser beams combining technology and PZT phase modulator, which can provide reference for development of coherent beam combination of fiber lasers.]]></description>
<pubDate>2012/8/27 9:46:18</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[MA Yanxing,SI Lei,ZHOU Pu,WANG Xiaolin,ZHANG Kan,ZHAO Haichuan,XU Xiaojun and ZHAO Yijun]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>MA Yanxing,SI Lei,ZHOU Pu,WANG Xiaolin,ZHANG Kan,ZHAO Haichuan,XU Xiaojun and ZHAO Yijun</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201201009]]></guid><cfi:id>39</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[An adaptive window affine least squares matching method]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201304009]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Due to the affine least squares matching method is unable to select the matching window adaptively without the initial parameter, an adaptive window least squares matching method based on local shape estimation was proposed. First, LOG (Laplacian of Gaussian)detector was used to detect feature points and characteristic scale; second, the second-order moment matrix in the neighborhood of feature points according to the characteristic scale was calculated; finally, the local shape estimation was applied to the adaptive selection of the initial matching window for affine iterative least squares method. The experiment results show that, the method can accurately select effective matching area under the larger affine deformation, avoiding iterative convergence problem caused by the window content differences. ]]></description>
<pubDate>2013/8/22 16:54:28</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[ZHU Zunshang<sup>1</sup>,ZHU Zhaokun<sup>1</sup>,CHEN Shengyi<sup>1</sup>,GUO Jinhu<sup>2</sup> and ZHANG Xiaohu<sup>1</sup>]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>ZHU Zunshang<sup>1</sup>,ZHU Zhaokun<sup>1</sup>,CHEN Shengyi<sup>1</sup>,GUO Jinhu<sup>2</sup> and ZHANG Xiaohu<sup>1</sup></atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201304009]]></guid><cfi:id>38</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Temperature field analysis and structure redesign of fiber optic gyroscope]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201302031]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Based on partial differential equation of heat conduction, a temperature field model of fiber optic gyroscope (FOG) was established. The steady-state temperature field and the transient temperature field were given. A circuit to measure temperature using a platinum resistor was designed. The experiment results are compared with the simulated ones and the error is less than 3%, which validates the legitimacy of the simulation. The structure of FOG was redesigned to improve the thermal symmetry of the fiber ring. The steady-state temperature field indicates that the temperature difference of the fiber ring is reduced 73.7 percent to 0.05 degree after structure redesign. The transient temperature field in 10 min shows that the temperature difference of the fiber ring is reduced 42.1 percent to 0.11 degree after structure redesign. ]]></description>
<pubDate>2013/5/21 9:27:56</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[ZHANG Wei,CAI Yingbo and WEI Xuetong]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>ZHANG Wei,CAI Yingbo and WEI Xuetong</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201302031]]></guid><cfi:id>37</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Research on infrared target segmentation]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201302032]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Infrared target segmentation is very valuable to infrared target detection and tracking. The research proposes an effective infrared target segmentation based on background and target gray character. The method avoids gray instability in the interior of the targets caused by temperature instability. Firstly, two-dimensional MCC based on gray-salience was proposed to segment targets. Then, improved region-growing algorithm based on random reed points was presented to extract background. Finally, morphological operation improved the segmentation performance. Compared with the traditional algorithms of target segmentation, this algorithm has better anti-jamming and robust. The method can be used not only for target segmentation but also for other similar segmentation.]]></description>
<pubDate>2013/5/21 9:27:56</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[HOUWang,ZHONG Lijun,ZHANG Xiaohu,LEI Zhihui and YANG Xia]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>HOUWang,ZHONG Lijun,ZHANG Xiaohu,LEI Zhihui and YANG Xia</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201302032]]></guid><cfi:id>36</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Iterative interpolation point cloud registration algorithm 
based on fast point feature histograms]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201406003]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[To improve the registration accuracy of point cloud data generated by 3D laser scanning, a new method of iterative interpolation registration based on fast point feature histograms (FPFH) was proposed. Due to the effect of the scanner's resolution in the process of registration, partial or overall density of obtained point cloud data was smaller so that there were no same points even the measuring locations of point cloud data were fixed. Therefore, errors existed between corresponding points. In order to reduce the influence of these errors on the registration accuracy, iterative interpolation method was introduced to increase the overall density of point cloud. The FPFH features of key points were used to find the corresponding relationship; random sample consensus algorithm was used to remove the false correspondence between two point clouds; then the coarse registration rotation and translation matrix was gotten by using singular value decomposition algorithm on the corresponding covariance matrix; at last, the iterative closest point algorithm was employed for the precise registration of point clouds. The experimental results show that the improved registration algorithm is simple, stable and reliable and its computation velocity is faster. This method effectively improves the accuracy of registration results.]]></description>
<pubDate>2015/1/22 16:38:31</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[LU Jun and PENG Zhongtao]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>LU Jun and PENG Zhongtao</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201406003]]></guid><cfi:id>35</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Real-time measurement system for motion parameters of aerial target]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201406010]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[An automatic tracking measurement system was designed to achieve real-time measurement for motion parameters of long-range air targets, such as aircraft. Hardware, software and key technologies were described in this system. The prototype was made and tested, the software structure design and corresponding functional modules were analyzed. Multiple experiments are presented to testify the working performance of the system. The static verification experiment indicates that the ranging results are stable within 1mm and the azimuth measurement results are stable within 5″. And the dynamic verification experiment indicates that the ranging error of moving target is 2 mm, the ranging frequency is 5Hz, the azimuth measurement error is 0.05°, and the posture measurement error is maintained at a level less than 0.2°, the real time measurement frequency of azimuth and posture are 20Hz. From the above analysis, the system can provide a stable, reliable and high precision automatic real-time measurement when testing motion parameters of aerial target.]]></description>
<pubDate>2015/1/22 16:38:31</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[GUAN Banglei,CAO Yu,YANG Xia,ZHOU Langming and ZHANG Xiaohu]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>GUAN Banglei,CAO Yu,YANG Xia,ZHOU Langming and ZHANG Xiaohu</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201406010]]></guid><cfi:id>34</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Temperature characteristics of input axis misalignment angle of fiber optic gyro]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201403009]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The temperature variation characteristic of the input axis misalignment angle of fiber optic gyro has become one of the key problems of orthogonal calibration of the fiber optic gyro inertia system. Firstly, a kind of measurement method, which can eliminate the measurement errors effectively, was presented. Then, the input axis misalignment angles of three fiber optic gyros with elliptical-structure optical fiber rings were measured. It is found that the three samples have similar input axis misalignment angles; the input axis misalignment angles vary non-monotonously with the changing of temperature; and the varying velocity is fast relatively in high temperature region. The results may be useful for improving the manufacturing technology of the fiber ring of the fiber optic gyro and will be helpful to prompt the temperature compensation technology of the orthogonal calibration in fiber optic gyro inertia system.]]></description>
<pubDate>2014/7/17 17:22:22</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[YANG Mingye,SONG Zhangqi,ZHANG Xueliang and CHEN Yuzhong]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>YANG Mingye,SONG Zhangqi,ZHANG Xueliang and CHEN Yuzhong</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201403009]]></guid><cfi:id>33</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Multi-viewpoint image mosaicing algorithm for roughly planar scenes]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201402025]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Aiming at applications of small unmanned aerial vehicle (UAV) in earth observations, this research explores the multi-viewpoint image mosaicing problems for roughly planar scenes. When coarse camera poses are known, a method for integrating camera poses and feature correspondences is proposed, in which direct sparse Cholesky factorization algorithm is used to solve the global optimization problems of mosaicing. Global distortions do not exist in the obtained mosaics and local mosaic errors are suppressed effectively. When the camera poses are unknown, a structure-from-motion (SFM) system is used to recover the cameras poses and sparse structure of the scene firstly. Then, the sparse global adjustment is used to refine the transformations. The proposed algorithm is validated using sand table images and real aerial images.]]></description>
<pubDate>2014/5/14 17:10:49</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[XU Yuhua<sup>1,2</sup>, GONG Wenquan<sup>2</sup>, SU Ang<sup>1</sup>, ZHANG Yueqiang<sup>1</sup>, ZHANG Xiaohu<sup>1</sup>]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>XU Yuhua<sup>1,2</sup>, GONG Wenquan<sup>2</sup>, SU Ang<sup>1</sup>, ZHANG Yueqiang<sup>1</sup>, ZHANG Xiaohu<sup>1</sup></atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201402025]]></guid><cfi:id>32</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[System design and method research for optical measurement images 
real-time interpretation in test ranges]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201402028]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Some key issues of real-time interpretation for optical measurement images in test ranges to design were researched and a real-time interpretation and estimation system was realized. Automatic Target capture, tracking and high precision location for interpretation features are the questions under probe. Shape similarity analysis, online region tracking and learning, and iterative contour registration were respectively used to locate multiple interpretation points. Based on the characteristics of real-time processing, such as high efficiency requirement, strong parallelism capability, and rigorous sequence in time, the software architecture design pattern of distributed framework with business process management was adopted to achieve the centralized administration of data and process, multiple sites parallel interpretation, data-driven auto estimation method selection and friendly user interface. Take the aerial launching tests of the air ranges as an example, the feasibility and efficiency of the system was examined by the experiment. The system can be extended to various test ranges to meet the users’ need of weapon test data’s real-time gain and analysis.]]></description>
<pubDate>2014/5/14 17:10:49</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[GUO Pengyu<sup>1,2</sup>, DING Shaowen<sup>1,2</sup>, TIAN Zunhua<sup>1,2</sup>, ZHANG Hongliang<sup>1,2</sup>, ZHANG Xiaohu<sup>1,2</sup>]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>GUO Pengyu<sup>1,2</sup>, DING Shaowen<sup>1,2</sup>, TIAN Zunhua<sup>1,2</sup>, ZHANG Hongliang<sup>1,2</sup>, ZHANG Xiaohu<sup>1,2</sup></atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201402028]]></guid><cfi:id>31</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Subsurface damage rule of deep aspheric surface by grinding]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201506010]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Deep aspheric optical element can obviously improve the aerodynamic performance of the optical system, thus enhancing and optimizing the comprehensive performance of optical system. The grinding method can be used for primary machining of such elements. However, subsurface damage will be inevitably introduced by this method, and grinding parameters will be changing in real time in the processing of deep aspheric surface, so the depths of subsurface damage of the workpiece are inconsistent. In view of this situation, subsurface damage prediction model was established. Combined with  the characteristics of semi-sphere wheels grinding, a theoretical calculation was made to predict distributive regularity of the aspheric grinding subsurface damage depths aspheric characteristics. On the basis of the above work, a simulation experiment on hot-pressing polycrystalline magnesium fluoride plane was carried out. Subsurface damage depths under different conditions of grinding parameters were acquired by the method of magnetorheological finishing  spot. Results show that the depth range is between 12.79μm and 20.96μm, which increases from inside to outside along the radius of the workpiece and the results are coincide with previous forecast model.]]></description>
<pubDate>2015/12/31 10:11:11</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[ZHU Dengchao<sup>1,2</sup>, DAI Yifan<sup>1,2</sup>, GUAN Chaoliang<sup>1,2</sup> and WANG Guilin<sup>1,2</sup>]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>ZHU Dengchao<sup>1,2</sup>, DAI Yifan<sup>1,2</sup>, GUAN Chaoliang<sup>1,2</sup> and WANG Guilin<sup>1,2</sup></atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201506010]]></guid><cfi:id>30</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[An image sub-pixel registration algorithm based on combination of curved surface fitting method and gradient method]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201505028]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In order to overcome the disadvantages of the low registration accuracy and the computational complexity of traditional algorithms, a new sub-pixel registration algorithm  based on combination of curved surface fitting method and gradient method was proposed. Firstly, curved surface fitting method based on 9 correlation coefficients was used to achieve the image rough registration. Secondly, subimages were extracted from the reference images according to a predefined selection method. At last, gradient method based on the rough registration was proposed to achieve the accurate sub-pixel registration. Test results among experimental images with different translational relations show that the new algorithm has the advantages of both curved surface fitting method and gradient method, and greatly improves the accuracy of image subpixel registration．The maximum absolute error of registration accuracy is reduced from 0.17 pixel to 0.02 pixel.]]></description>
<pubDate>2015/11/9 16:21:59</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[LIU Hongliang<sup>1</sup>, CHEN Weiyi<sup>1</sup> and XU Zhongsheng<sup>2</sup>]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>LIU Hongliang<sup>1</sup>, CHEN Weiyi<sup>1</sup> and XU Zhongsheng<sup>2</sup></atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201505028]]></guid><cfi:id>29</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Damage characteristic of microwave pulse injected on
Si bipolar transistor]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201502001]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The experiment of damage effect on Si bipolar transistor-low noise amplifier injected the microwave pulse in experimental platform. In the failure analysis of Si bipolar transistor-low noise amplifier with microwave pulse, the transistor was permanently damaged when the gain of lownoise amplifier decreased more than 10 dB. The electrical characteristic of the Si bipolar transistor was measured before and after its damage and the micro-characteristic of the damaged transistor was observed by scanning electron microscope. Results show that when the Si bipolar transistor is damaged with microwave pulse, the ablative Si material in the base region causes short circuit of emitter junction and collector junction, which have the consequences of losing the PN junction characteristics and leading to failure devices.]]></description>
<pubDate>2015/5/16 9:33:23</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[ZHANG Cunbo, ZHANG Jiande, WANG Honggang and DU Guangxing]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>ZHANG Cunbo, ZHANG Jiande, WANG Honggang and DU Guangxing</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201502001]]></guid><cfi:id>28</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Overstress characteristics of metalized 
polypropylene pulse capacitor]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201502002]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[As one of the energy storing elements of explosively-driven flux compression generators, the pulsed capacitor was required to discharge only once, such as explosively-driven flux compression generators. Therefore, it provided a possibility to make the pulsed capacitor working in overstress. Compared with the overstressing capacitor, the pulsed capacitor has several advantages, such as small volume and light weight. So it could be used as a current driver to miniaturize explosively-driven flux compression generators. The overstress characteristics of metalized polypropylene pulse capacitor (MPP capacitor) were investigated at different temperatures. Experimental results show that the energy storage density is 1.8 times of the rated energy storage density at the temperature of-45~60℃, and in this condition, the oneside lower confidence limit of reliability is 0.9 if the confidence level is 0.95.]]></description>
<pubDate>2015/5/16 9:33:23</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[ZHANG Tianyang<sup>1</sup>, SONG Zuyin<sup>2</sup>, YUAN Yunhua<sup>2</sup>, QIN Shu<sup>2</sup>, CHEN Dongqun<sup>1</sup> and LIU Jinliang<sup>1</sup>]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>ZHANG Tianyang<sup>1</sup>, SONG Zuyin<sup>2</sup>, YUAN Yunhua<sup>2</sup>, QIN Shu<sup>2</sup>, CHEN Dongqun<sup>1</sup> and LIU Jinliang<sup>1</sup></atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201502002]]></guid><cfi:id>27</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Influence of stray parameters on output characteristics of 
the series magnetic pulse compressor]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201502003]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[P-Spice was used to analyze the influence of stray parameters, including self-inductance of the pulse capacitor and the inter-turn capacitance and the impedance of the winding in magnetic switch, on output characteristics of the series magnetic pulse compressor. Results show that inter-turn capacitance and the impedance in unsaturated state of the winding make minor influence on the output waveform. However, the impedance in saturated state of the winding reduces the voltage efficiency of the system, conspicuously. Moreover, the self-inductance of the pulse capacitor not only reduces the voltage efficiency but also influences the rise-time of the output voltage waveform. Based on former results, the single stage magnetic pulse compressor system was optimized and a series magnetic pulse compressor, with peak voltage of 26kV, whose pulse rise-time is compressed from 4.1s to 1.2s and whose voltage efficiency is over 92.5% was developed. ]]></description>
<pubDate>2015/5/16 9:33:24</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[LI Song, GAO Jingming, YANG Hanwu and QIAN Baoliang]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>LI Song, GAO Jingming, YANG Hanwu and QIAN Baoliang</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201502003]]></guid><cfi:id>26</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Optical diagnosis system based on Cerenkov radiation for 
the uniformity of intense electron beam diode]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201502004]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Electrons traversing a transparent medium emit Cerenkov light when the electron velocity exceeds the velocity of light in the medium. A time-and-space resolved optical diagnosis system based on Cerenkov radiation for the uniformity of intense electron beam diode has been founded. Before the operation of a series experiments, Particle-in-cell and Monte Carlo simulation codes were utilized to design the experiment structure. The emission uniformity of two kinds of velvet sample was studied. It was found that the carbon velvet cathode has much bigger central enhancement zone and the Cerenkov radiation light of the area near the edge is also brighter. The operating state of diode can be obtained by analyzing the time evolutions of Cerenkov radiation light which achieves 10ns~100ns temporal resolution.]]></description>
<pubDate>2015/5/16 9:33:24</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[CAI Dan<sup>1</sup>, LIU Lie<sup>1</sup>, JU Jinchuan<sup>1</sup> and WANG Xiao<sup>2</sup>]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>CAI Dan<sup>1</sup>, LIU Lie<sup>1</sup>, JU Jinchuan<sup>1</sup> and WANG Xiao<sup>2</sup></atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201502004]]></guid><cfi:id>25</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Simulation of a high impedance relativistic klystron 
amplifier with a cold cathode]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201502005]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[A high impedance relativistic klystron amplifier with a cold solid cathode is designed and investigated by 2.5-D particle-in-cell simulations. The model is composed of a diode with a shielding ring, five pill-box cavities and a cone collector. In order to simplify and minimize the cathode structure, a cold cathode is designed and adopted in a high-impedance relativistic klystron amplifier with rather high conversion efficiency. A shielding ring is introduced to achieve the desired high impedance and reduces the surface electric field to avoid unexpected explosive emissions and ensures the emission uniformity. In the beam-wave interaction region, with optimization of the position of the last two cavities and the magnetic field, the performance of the klystron is validated. It reveals that microwaves with a power of 81 MW are generated at a frequency of 11.424GHz when the beam voltage and current are 525kV and 328 A respectively, under a guiding magnetic field of 0.35 T. The corresponding power conversion efficiency is as high as 47%, and the gain reaches 49 dB when the net injection power is 1 kW.]]></description>
<pubDate>2015/5/16 9:33:24</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[ZHU Danni, ZHANG Jun, ZHONG Huihuang and QI Zumin]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>ZHU Danni, ZHANG Jun, ZHONG Huihuang and QI Zumin</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201502005]]></guid><cfi:id>24</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Ku-band magnetically insulated transmission line oscillator 
with a gradual transitional extractor]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201502006]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[To solve the problems of impure output modes and inefficient TEM transmission in the Ku-band MILO with the conventional uniform coaxial extractor, a gradual transitional coaxial extractor was proposed. The simulation results show that: the gradual transitional coaxial extractor achieves efficient microwave extraction and a single output TEM; the transitional coaxial structure is conductive to the design of supports and meets TEM transmission requirements. Compared with the traditional extractor, the gradual transitional coaxial extractor can strengthen the beam-wave interaction and accelerate the microwave start-up through enhancing the quality factor of the Ku-band MILO in right amount.]]></description>
<pubDate>2015/5/16 9:33:24</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[JIANG Tao, HE Juntao, ZHANG Jiande, LI Zhiqiang and LING Junpu]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>JIANG Tao, HE Juntao, ZHANG Jiande, LI Zhiqiang and LING Junpu</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201502006]]></guid><cfi:id>23</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Numerical computation of dispersion curves in the Ka-band 
overmoded slow wave structure]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201502007]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Backward wave oscillator with over-mode Ka-band high power microwave (HPM) generally outputs mixed TM0n modes, it has high energy conversion efficiency, but it can′t ensure the purity of output modes. However, it is necessary for high radiation efficiency that the microwave input to the radiation terminal is certain single and pure. So it is hard to put these HPM sources into application. In order to solve this problem, a design method for compact hybrid modes converter of purifying TM0n mixed modes was proposed. With this method, the TM01, TM02 and TM03 mixed modes can be converted into pure circular waveguide TM01 mode efficiently on the condition of high power capacity and wide wave band. This method also reduces the modes purification difficulty in the design of the HPM sources.]]></description>
<pubDate>2015/5/16 9:33:24</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[WU Dapeng, SHU Ting and ZHANG Hua]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>WU Dapeng, SHU Ting and ZHANG Hua</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201502007]]></guid><cfi:id>22</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Simulation study on  compact relativistic magnetron 
with TE<sub>10</sub> mode axial output]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201502008]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[A compact relativistic magnetron with axial output for TE<sub>10</sub> mode was investigated. This magnetron with 6 resonant cavities operates at πmode and can well transit between resonant cavities and rectangular output waveguide through the structure design of 4 cavities axial output, which realizes the microwave output of rectangular TE<sub>10</sub> mode. Compared with the magnetron with diffraction output (MDO), this design not only makes both the diameter and the axial length of the magnetron minimized so that the whole system can be more compact, but also provides a much purer output mode of a low order in the output waveguide. The operating performance of the magnetron has been analyzed and optimized by using particle-in-cell simulation software. Simulation results show that the power conversion efficiency can reach to 25.0%, corresponding to the output power of 10GW and the working frequency of 2.58GHz, under the condition of the applied voltage of 500kV and the applied magnetic field of 0.5T.]]></description>
<pubDate>2015/5/16 9:33:24</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[SHI Difu, QIAN Baoliang, WANG Honggang and LI Wei]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>SHI Difu, QIAN Baoliang, WANG Honggang and LI Wei</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201502008]]></guid><cfi:id>21</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Design of Ku-band high powerTM<sub>0n</sub>-TM<sub>01</sub>
hybrid modes convertor]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201502009]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Backward wave oscillator with over-mode Ku-band high power microwave (HPM) generally outputs mixed TM<sub>0n</sub> modes, it has high energy conversion efficiency, but it can′t ensure the purity of output modes. However, it is necessary for high radiation efficiency that the microwave input to the radiation terminal is certain single and pure. So it is hard to put these HPM sources into application. In order to solve this problem, a design method for compact hybrid modes converter of purifying TM<sub>0n</sub> mixed modes was proposed. With this method, the TM<sub>01</sub>,TM<sub>02</sub> and TM<sub>03</sub> mixed modes can be converted into pure circular waveguide TM<sub>01</sub> mode efficiently on the condition of high power capacity and wide wave band. This method also reduces the modes purification difficulty in the design of the HPM sources.]]></description>
<pubDate>2015/5/16 9:33:24</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[PENG Shengren, YUAN Chengwei, SHU Ting, ZHANG Qiang and WU Dapeng]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>PENG Shengren, YUAN Chengwei, SHU Ting, ZHANG Qiang and WU Dapeng</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201502009]]></guid><cfi:id>20</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[TM<sub>01</sub> mode phase shifter for high power microwave]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201502010]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[A novel TM<sub>01</sub> mode high power microwave phase shifter is proposed which is composed of two crossed circularly polarized TE<sub>11</sub> mode converter. The phase of the output microwave can be adjustable in a range of 0°~360°. The electromagnetic behaviors of the circularly polarized TE<sub>11</sub> mode converter and the phase shifter are simulated by the software CST. The results show that the output microwave can be adjustable in a range of 0°~360°at the frequency of 1.75GHz with the error is not more than 1 °, the transmission efficiency in this range is larger than 97%, and the power capacity is larger than 4.3GW.]]></description>
<pubDate>2015/5/16 9:33:24</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[ZHAO Xuelong, YUAN Chengwei, LIU Lie, PENG Shengren, BAI Zhen and CAI Dan]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>ZHAO Xuelong, YUAN Chengwei, LIU Lie, PENG Shengren, BAI Zhen and CAI Dan</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201502010]]></guid><cfi:id>19</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Static angle measurement based on mechanically dithered ring laser gyro]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201603023]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The principle of static angle measurement based on mechanically dithered ring laser gyro was described. The expression of angle measurement random error with gyro′s angle random walk coefficient and measurement time was analyzed and verified by checking the indexing errors of turntable. The systematic error of static angle measurement and the indexing errors of turntable were separated by using the permutation intercomparison method. Test results and analysis show that the static angle measurement method is robust under practical environment, the standard deviation of random error is less than 0.26″ and the systematic error is less than 1″. The key techniques for further improvement in accuracy were analyzed.]]></description>
<pubDate>2016/7/7 11:14:22</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[XIE Yuanping, YU Xudong, WEI Guo, LONG Xingwu, LUO Hui, HUANG Yun and WAN Zhiyi]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>XIE Yuanping, YU Xudong, WEI Guo, LONG Xingwu, LUO Hui, HUANG Yun and WAN Zhiyi</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201603023]]></guid><cfi:id>18</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Infrared quantitative identification for thickness and material inner defects of thermal barrier coating]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201601018]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Aiming at the problems of infrared quantitative detection of thermal barrier coating structures, the LM recognition algorithm based on pulse phase was put forward. The transient thermal model of thermal barrier coating structures was established in an axisymmetric cylindrical coordinate in view of the research problem. The surface temperature field of the research model was calculated by the finite volume method. Then the phase distribution of the inspection surface was obtained through a fast Fourier transform. The impacts of parameters to be detected on the phase difference of the inspection surface were analyzed. Taking the phase as identification condition, the quantitative identification of coating thickness and material inner defects was conducted by using LM inversion algorithm. The effectiveness of LM identification method on the basis of phase detection was evidenced by the numerical experiment results.]]></description>
<pubDate>2016/3/7 9:21:22</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[CHEN Lin<sup>1,2</sup>, YANG Li<sup>1</sup>, FAN Chunli<sup>1</sup>, SHI Hongchen<sup>1</sup> and ZHAO Xiaolong<sup>1</sup>]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>CHEN Lin<sup>1,2</sup>, YANG Li<sup>1</sup>, FAN Chunli<sup>1</sup>, SHI Hongchen<sup>1</sup> and ZHAO Xiaolong<sup>1</sup></atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201601018]]></guid><cfi:id>17</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Study on the bias error compensation of ring laser gyroscope based on compound signals]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201601026]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[As a complex system combined with optics, electronics and mechanics, the RLG (ring laser gyroscope) can measure the angle rate with high accuracy. In order to meet the requirement of longer-time and higher precision in inertial navigation system, the characteristics between the RLG drift error and different signals from various sensors were studied. Based on the traditional RLG drift error compensation model, the compound signals from thermometers, photodiodes and piezoelectric ceramics attached on the dithered mechanism were introduced into the model. Moreover, by utilizing the support vector machine algorithm which has good nonlinear fitting capacity, the model was optimized by the correlation features between the mechanically dithered RLG drift error and the compound signals. The experimental results show that the precision of the mechanically dithered RLG drift error compensation model is higher than the traditional one.]]></description>
<pubDate>2016/3/7 9:21:23</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[LI Geng, ZHANG Pengfei and LONG Xingwu]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>LI Geng, ZHANG Pengfei and LONG Xingwu</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201601026]]></guid><cfi:id>16</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Method for fiber ring eigenfrequency by sine wave modulation]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201706029]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[A new measuring method for fiber ring eigenfrequency was presented.  Different from the common square wave modulating, the new method is based on the sine wave modulation, so the problem of dead zone was solved. The output signal of fiber optic gyroscope was analyzed when using sine wave modulation, quadratic relationship was obtained between second harmonic and modulation frequency, eigenfrequency can be obtained by calculating the parabolic vertex. On the basis of the new method, a test system was developed by updating fiber optic gyroscope system. Test result shows that the measuring precision of 10 ppm can be achieved, which shows that the proposed method is a method with low cost and high precision method for fiber ring eigenfrequency.]]></description>
<pubDate>2018/1/16 17:02:02</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[CHEN Yuzhong, SONG Zhangqi and ZHANG Xueliang]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>CHEN Yuzhong, SONG Zhangqi and ZHANG Xueliang</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201706029]]></guid><cfi:id>15</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Jitter detection and reconstruction method for high-resolution optical satellite images  using linear accelerometer]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201705023]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Under the condition of satellite platform′s jitter, the push-broom high-resolution optical imaging often produces distortion, which affects the accuracy of the image positioning and information extraction. According to the critical compensation issue for distorted images, a steady-state imaging model with the linear accelerometer directly measuring platform jitter was proposed to achieve reconstruction of high-resolution distorted images. The effectiveness was validated by using the distorted panchromatic image of a high-resolution satellite affected by platform jitter. The analysis results show that the linear accelerometer can effectively detect and measure the platform jitter, the designed on-ground reconstruction model of jitter image can effectively improve the distorted imaging of push-broom optical image caused by platform jitter, and the jitter image′s distortion phenomenon can be obviously eliminated.]]></description>
<pubDate>2017/11/7 15:44:04</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[FAN Chengcheng<sup>1</sup>, WANG Mi<sup>1</sup>, JIN Shuying<sup>1</sup>, PAN Jun<sup>1</sup>, WANG Yan<sup>2</sup> and ZHANG Biao<sup>2</sup>]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>FAN Chengcheng<sup>1</sup>, WANG Mi<sup>1</sup>, JIN Shuying<sup>1</sup>, PAN Jun<sup>1</sup>, WANG Yan<sup>2</sup> and ZHANG Biao<sup>2</sup></atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201705023]]></guid><cfi:id>14</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Effect of preheating primary dilution He on the output performance of a combustion-driven DF laser]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201806024]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[A theoretical and simulated calculation of the processes proceeding in a gain generator of a combustiondriven cw DF chemical laser with preheated primary dilution He was reported. Investigation results demonstrate that for DF lasers with fuel systems of (H<sub>2</sub>+NF<sub>3</sub>+He)+D<sub>2</sub> and (C<sub>2</sub>H<sub>4</sub>+NF<sub>3</sub>+He)+D<sub>2</sub>, when the primary dilution He is preheated to (1100 K,1300 K), the available specific output power is improved by (21%, 24%) and (46%, 56%) respectively; and at the same time, the fuel consumption in the combustor is reduced by (255%, 29%) and (32%, 36%) respectively. In practical application, the primary dilution He can be heated to 800℃(1100 K) successfully. Therefore, preheating the primary dilution He is a feasible and effective method to improve the laser output characteristics, which can facilitate the development of more compact chemical lasers with higher efficiency.]]></description>
<pubDate>2019/1/17 15:43:46</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[FANG Xiaoting, YUAN Shengfu and HUA Weihong]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>FANG Xiaoting, YUAN Shengfu and HUA Weihong</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201806024]]></guid><cfi:id>13</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Research progress in controlling femtosecond laser filamentation in atmosphere]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201804001]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Under the dynamic equilibrium among diffraction, dispersion, Kerr effect and multiple photons ionization, a self-guiding filament formed by femtosecond laser with long propagation distance can be constructed, which is accompanied by a narrow plasma channel. In order to control the propagation features of filamentation explicitly in air, a way to effectively regulate filamentation propagation modes and spatiotemporal distributions has become a research hotspot. On the basis of introducing the physical model of filamentation briefly, a general overview of controlling filamentation divided by two parts was presented in this review: temporal modulations and spatial modulations. In particular, the latter consists of modulations designed by phase, amplitude and special beams. Our findings suggest that unique filaments controlled by initial modulations can offer advantages and fundamentals for the realization of numerous potential applications.]]></description>
<pubDate>2018/9/17 0:00:00</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[NIE Jinsong and HU Yuze]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>NIE Jinsong and HU Yuze</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201804001]]></guid><cfi:id>12</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[ZnGeP<sub>2</sub> optical parametric oscillator 4.3 μm laser with narrow line-width]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201804002]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In order to design high-power narrow linewidth 4.3 μm laser, the narrow linewidth 4.3 μm laser was obtained by ZnGeP<sub>2</sub> OPO (optical parametric oscillation) pumped by a 2.7 μm laser. Experimental results were analyzed in detail. The pump source was a 2.7 μm KTiOPO<sub>4</sub> OPO laser pumped by a 1064 nm Nd:YAG laser, and the KTiOPO<sub>4</sub> OPO was singly resonated. Two identical KTiOPO<sub>4</sub> crystals were placed with opposite optical axis to compensate the walk off effect. The KTiOPO<sub>4</sub> crystals were cut asΦ=0°,θ=62° to generate 2.7 μm wave band laser. To utilize the large effective nonlinear coefficient, the phase matching was based on type Ⅱ(B) (o→o+e). The ZnGeP<sub>2</sub> OPO was singly resonated too. To output narrow linewidth laser, the phase matching is based on typeⅡ(B) (o→o+e).The ZnGeP<sub>2</sub> crystal was cut as Φ=0°,θ=68° to generate 4.3 μm laser. The energy of the 2.7 μm laser is 7.5 mJ with a pulse of 8.6 ns and line-width 12 nm.The pulse energy of 2.12 mJ at 4.26 μm with an optical-optical conversion efficiency of 28.3% and a slop efficiency of 32.6% is obtained, and the pulse width is 8.7 ns, the line-width is 30 nm. The beam qualities M<sup>2</sup> of horizontal and vertical directions are 6.2 and 13.5, respectively.]]></description>
<pubDate>2018/9/17 0:00:00</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[BIAN Jintian, YE Qing and SUN Xiaoquan]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>BIAN Jintian, YE Qing and SUN Xiaoquan</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201804002]]></guid><cfi:id>11</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Simulation of transient evolution characteristics of silicon ablated by femtosecond laser]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201804003]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In order to further reveal the transient evolution characteristics of silicon ablated by femtosecond laser, the theoretical model was established, and the numerical simulation was carried out. The results show that the femtosecond laser can excite a large amount of electrons with its density exceeding the damage threshold in the pulse duration. At that time, the lattice remains in a “cold” state until it reaches the melting point temperature as long as 1 ns order of magnitude. The temperature of electrons dramatically increases to 10<sup>4</sup> K level in the laser pulse irradiation moment. And then the energy is released slowly to lattice and the thermal equilibrium is reached until 10 ns order of magnitude. The electron has two rapid warming processes. The first one starts from the free-carrier absorption, and stops at the electron-lattice energy coupling; the second one starts from the single photon and two photon absorption, and ends at the end of the pulse. It is found that the higher the temperature and density of electron are,  the bigger the pulse energy is and the shorter the pulse duration is.]]></description>
<pubDate>2018/9/17 0:00:00</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[DOU Xianan, SUN Xiaoquan and XU Haiping]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>DOU Xianan, SUN Xiaoquan and XU Haiping</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201804003]]></guid><cfi:id>10</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Design of dual-wavelength composite jamming laser with high-repetitive frequency]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201804004]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In order to solve the contradiction between high repetition rate of fundamental wave and high average power of second-harmonic wave, a new 1064 nm/532 nm dual-wavelength composite jamming laser with high-repetitive frequency was designed. The composite output characteristics of the laser were obtained by the static analysis of the pump source′s efficiency, heat and force distribution of crystal, and by the Gauss mode of laser. The influence on the dualwavelength composite output was analyzed by changing the Q-switching frequency, the length of the second harmonic generation crystal and by simulating the thermal effect of second harmonic generation crystal. It is found that the high frequency of fundamental wave should be satisfied first, and the output power of secondharmonic wave can be improved by optimizing the length of the second harmonic generation crystal and by controlling the temperature of second harmonic generation crystal under the condition of the constant pumping power and the structure of the resonator. The simulation conclusion was verified by an experiment. The experimental results show that when the length of KTiOPO<sub>4</sub> crystal is chosen as 12 mm, the transmissivity of the output mirror is fixed to 10%, and the Q-switching frequency is selected as 50 kHz, the average output power of the fundamental wave is 18.98 W, and the average power of the output of secondharmonic wave is 2.22 W. ]]></description>
<pubDate>2018/9/17 0:00:00</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[YE Qing<sup>1</sup>, FAN Yisong<sup>1,2</sup>, WANG Lei<sup>1</sup> and BIAN Jintian<sup>1</sup>]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>YE Qing<sup>1</sup>, FAN Yisong<sup>1,2</sup>, WANG Lei<sup>1</sup> and BIAN Jintian<sup>1</sup></atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201804004]]></guid><cfi:id>9</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Study on the saturation mechanism of multi-alkali photocathode]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201804005]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The study of the saturation mechanism of multialkali photocathode is of great significance for improving its electron emission performance. According to the threestep electron emission model, the electron emission process of a multi-alkali photocathode was studied by Monte-Carlo method. Simulation results were compared with the experimental data in the related literatures, which shows that when the photon energy is near the photoemission threshold of the photocathode, the obtained quantum efficiency curves and electron energy distribution curves were in good agreement with experimental data. Based on the above model, the photo-voltage effect and the space charge effect on the electron emission characteristics of multialkali photocathode were studied. Results show that the threshold laser energy density of the photocathode is about 8 μJ/cm<sup>2</sup> under the photovoltage effect, and 2.23 μJ/cm<sup>2</sup> under the space charge effect. An experimental investigation of the saturation effect of multi-alkali photocathode irradiated with 266 nm laser is conducted, and the saturation threshold laser energy density is about 2 μJ/cm<sup>2</sup>, which indicates that the space charge effect is the main factor limiting its photoelectron emission capability. ]]></description>
<pubDate>2018/9/17 0:00:00</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[XIE Yuntao, SUN Xiaoquan, WANG Xi and ZHANG Yujun]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>XIE Yuntao, SUN Xiaoquan, WANG Xi and ZHANG Yujun</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201804005]]></guid><cfi:id>8</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Transverse acceleration property of non-diffracting Airy beam]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201804006]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The transverse acceleration property of Airy beams makes it possible for beams to propagate along the curved trajectories in free space. The transverse acceleration propagation property of the new-type Airy beams was studied by utilizing the one-dimensional paraxial wave equation. The simulation results show that the transverse acceleration of Airy beam is relevant to the propagation distance and arbitrary transverse scale when the wavelength keeps constant. The transverse acceleration will become larger when the propagation distance becomes longer and the transverse scale becomes smaller. The Poynting vector was utilized to analyze the mechanism of accelerating property of Airy beams. Moreover, the twodimensional finite Airy beam was generated by utilizing the universal liquid crystal spatial light modulator, and the experimental study on the transverse acceleration property of Airy beam was also carried out. The experimental results coincide well with the simulation results.]]></description>
<pubDate>2018/9/17 0:00:00</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[WU Yunlong, SUN Xiaoquan and NIE Jinsong]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>WU Yunlong, SUN Xiaoquan and NIE Jinsong</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201804006]]></guid><cfi:id>7</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Electric field characteristics of nuclear electromagnetic pulse simulator and protection performance of  plasma array]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201804007]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Strong electromagnetic pulse may cause serious damage once it is coupled into the interior of the electronic system. As a kind of special electromagnetic medium, the plasma has the ability of shielding strong electromagnetic pulse. Therefore, electromagnetic pulse protection technology based on the plasma is of practical significance. The electric field distribution in work space of the nuclear electromagnetic pulse simulator was simulated and analyzed by the CST software. The interfering and damaging effect of the singlechip microcomputer under irradiation of the nuclear electromagnetic pulse was studied, the results showing that the interfering and damaging thresholds of the nuclear electromagnetic pulse to MF-51-1 MCU are 10 kV/m and 18 kV/m respectively. The protection performance of the onelayer plasma array to the nuclear electromagnetic pulse was experimentally studied, and the energy attenuation value can reach up to 10 dB. The research results show that the plasma has the protection ability against strong electromagnetic pulse.]]></description>
<pubDate>2018/9/17 0:00:00</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[LIU Yang, CHENG Li, WANG Jiachun, YUAN Zhongcai and SHI Jiaming]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>LIU Yang, CHENG Li, WANG Jiachun, YUAN Zhongcai and SHI Jiaming</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201804007]]></guid><cfi:id>6</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Design and analysis of loss functions of low-light level image enhancement neural networks under extreme low-light illumination]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201804011]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Under the extreme LLL （low light level） conditions (environment illumination less than 2×10<sup>-3</sup>lux), the LLL image has the characteristics of low signaltonoise ratio and low contrast, so that the target is difficult to be identified, thus seriously affecting the observation effect. In order to improve the LLL image quality, a convolutional autoencoder deep neural network for image enhancement was designed. In view of the fact that the traditional mean square error loss function cannot meet the human visual perception characteristics, several loss functions including perceptual loss were studied and a novel, differentiable loss function was proposed in combination with the existing full reference image quality evaluation index. Experimental results show that the proposed loss function can improve the detail information of the image while improving the signaltonoise ratio and contrast ratio of the lowlight level image when the network structure does not change. ]]></description>
<pubDate>2018/9/17 0:00:00</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[LIU Chao<sup>1,2</sup>, ZHANG Xiaohui<sup>1</sup> and HU Qingping<sup>1</sup>]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>LIU Chao<sup>1,2</sup>, ZHANG Xiaohui<sup>1</sup> and HU Qingping<sup>1</sup></atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201804011]]></guid><cfi:id>5</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Multi-view reconstruction measurement design based on binocular camera]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201804015]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Optical non-contact measurement of large-scale scenes has wide application in engineering. The multi-view reconstruction based on a single camera needs to arrange scale datum into the measurement area, and the image acquisition process is complex and requires a high overlap ratio between adjacent images. Therefore, a method of multi-view reconstruction using binocular cameras was presented. This method not only inherits the advantages of large measurement range in multi-view reconstruction, but also does not need to arrange scale datum, and the image acquisition process is simpler. Besides，the double camera constraint was added in the process of data optimization. Specific methods are as follows: firstly the internal parameters and solid connection of two cameras installed on the fixed rod were obtained according to camera calibration; then the binocular cameras were used to acquire the images of the area to be measured and obtain the spatial point cloud by binocular intersection. The transformation relation of the coordinate system of point cloud in adjacent time was calculated by the method of pose estimation, and the camera′s parameters and point cloud′s coordinate of each moment were transformed to the specified coordinate system. The position and pose of the camera and the coordinate of point cloud were optimized by using the bundle adjustment, and the size parameters and the deformation information were calculated from the point cloud coordinates. The test results show that in the range of 5 m, the measurement′s error is 3 mm, the average error is 1 mm. This method is suitable for the measurement of large scale object and scene and is stable and reliable.]]></description>
<pubDate>2018/9/17 0:00:00</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[DING Shaowen<sup>1,2</sup>, ZHANG Xiaohu<sup>1,2</sup>, WANG Jie<sup>1,2</sup> and SHI Zhongchen<sup>1,2</sup>]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>DING Shaowen<sup>1,2</sup>, ZHANG Xiaohu<sup>1,2</sup>, WANG Jie<sup>1,2</sup> and SHI Zhongchen<sup>1,2</sup></atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201804015]]></guid><cfi:id>4</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Test and simulation optimizing of the unimorph deformable mirror for low-order aberration correction]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201804017]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[The fiber laser beam has wave-front aberration, which restricts the performance and efficiency of optic systems. The aberrations′ character of the super-continuum fiber laser beam was analyzed with a building experiment system, and defocus was the main ingredient. According to the character, a prototype of 3-element unimorph DM (unimorph deformable mirror) was manufactured and tested. The simulation accuracy of the influence functions is more than 77% and the frequency response is 12.1 kHz. The results of closed loop correction simulation show that the 3-element unimorph deformable mirror′s correction accuracy for the actual aberration is 0.77. Meanwhile, the finite element analysis is used to optimize the fitting accuracy and displacement. At last a 9-element unimorph DM with the aperture 7.5 mm can reach the accuracy level of about 0.9. The thickness ratio of the mirror and the piezoelectric disk is optimized about  0.3, which further promotes more than 60% of the initial displacement.]]></description>
<pubDate>2018/9/17 0:00:00</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[FAN Zhanbin<sup>1,2</sup>, DAI Yifan<sup>1,2</sup>, NING Yu<sup>3</sup>, GUAN Chaoliang<sup>1,2</sup>, LIU Junfeng<sup>1,2</sup> and FU Tianyang<sup>3</sup>]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>FAN Zhanbin<sup>1,2</sup>, DAI Yifan<sup>1,2</sup>, NING Yu<sup>3</sup>, GUAN Chaoliang<sup>1,2</sup>, LIU Junfeng<sup>1,2</sup> and FU Tianyang<sup>3</sup></atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201804017]]></guid><cfi:id>3</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Infrared quantitative identification for inner boundary of fully developed turbulent pipeline]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201905026]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[Although the identification of pipelines′ inner boundary based on heat conduction has been matured, the quantitative identification of inner boundary of turbulent pipe, which is more practical, has scarcely been reported yet. The steady-state identification of the inner boundary shape of a turbulent pipe with fully developed two-dimensional axial symmetry was studied through the connection of COMSOL and MATLAB, as well as the use of finite element method and Levenberg-Marquardt method. The validity of this method was proved by numerical experiments. The results show that, in a turbulent pipeline with a defective inner boundary, the maximum temperature difference of outer wall and the absolute temperature difference caused by defect do not increase synchronously. During the identification of inverse inner boundary problem, due to the negative growth in the absolute temperature difference, the identification results do not necessarily improve with the increase of absolute temperature difference. The identification accuracy slightly deteriorates at the end of the irregular inner boundary.]]></description>
<pubDate>2019/9/30 15:58:02</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[ZHANG Lin, YANG Li and FAN Chunli]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>ZHANG Lin, YANG Li and FAN Chunli</atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201905026]]></guid><cfi:id>2</cfi:id><cfi:read>true</cfi:read></item>
<item>
<title xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="text"><![CDATA[Method for extracting texture features of  LiDAR point cloud]]></title>
<link><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201902018]]></link>
<description xmlns:cf="http://www.microsoft.com/schemas/rss/core/2005" cf:type="html"><![CDATA[In order to eliminate the ambiguity in the land cover classification of LiDAR point cloud by using the image texture, the texture feature of point cloud based on the searching structure of KD tree and the gray level co-occurrence matrix were proposed, which represents the distribution of attribute values of points and their surrounding neighborhood points. The influence of the parameters, such as search neighborhood, moving step and gray-level, on the texture features of point cloud was analyzed. Using the support vector machine classification method, it was verified that the texture feature of point cloud can effectively assist the elevation and intensity to improve the results of the land cover classification. In addition, the results demonstrated that the land cover classification under the constraint of the texture features of point cloud has higher accuracy than that under the constraint of the rasterbased image texture features, and the texture features of point cloud perform outstandingly in distinguishing tiny land objects and separating the water and land. These excellent characteristics of the texture features of point cloud can  contribute significantly to the refined classification of coastal LiDAR data, the construction of highprecision DEM in coastal zone and the extraction of coastlines.]]></description>
<pubDate>2019/4/24 14:24:49</pubDate>
<category><![CDATA[Optical Engineering]]></category>
<author><![CDATA[ZHOU Wei<sup>1,2,3</sup>, PENG Rencan<sup>2,3</sup> and DONG Jian<sup>2,3</sup>]]></author>
<atom:author xmlns:atom="http://www.w3.org/2005/Atom">
<atom:name>ZHOU Wei<sup>1,2,3</sup>, PENG Rencan<sup>2,3</sup> and DONG Jian<sup>2,3</sup></atom:name>
</atom:author>
<guid><![CDATA[http://journal.nudt.edu.cn/gfkjdxxben/article/abstract/201902018]]></guid><cfi:id>1</cfi:id><cfi:read>true</cfi:read></item>
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