| 引用本文: | 陈宇中,宋章启,张学亮.正弦波调制的光纤环本征频率测量方法.[J].国防科技大学学报,2017,39(6):193-196.[点击复制] |
| CHEN Yuzhong,SONG Zhangqi,ZHANG Xueliang.Method for fiber ring eigenfrequency by sine wave modulation[J].Journal of National University of Defense Technology,2017,39(6):193-196[点击复制] |
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| 正弦波调制的光纤环本征频率测量方法 |
| 陈宇中, 宋章启, 张学亮 |
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(国防科技大学 气象海洋学院， 湖南 长沙 410073)
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| 摘要: |
| 为了弥补传统光纤环本征频率测量方法中方波调制存在死区的缺陷，提出正弦波调制的本征频率测量方法。对正弦波调制下的光纤陀螺输出信号进行分析，得到二次谐波幅度与调制频率间的二次函数关系，通过计算抛物线顶点即可求得本征频率。依据该原理对已有的光纤陀螺进行升级改造，研制了一套本征频率测量系统。试验结果表明：该方法可达到1×10-5的测量精度，是一种成本低、精度高的光纤环本征频率测量方法。 |
| 关键词: 光纤陀螺 光纤环 本征频率 正弦波调制 二次谐波 |
| DOI：10.11887/j.cn.201706029 |
| 投稿日期：2016-07-15 |
| 基金项目:国家部委基金资助项目（51302040302） |
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| Method for fiber ring eigenfrequency by sine wave modulation |
| CHEN Yuzhong, SONG Zhangqi, ZHANG Xueliang |
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(College of Meteorology and Oceanology, National University of Defense Technology, Changsha 410073, China)
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| Abstract: |
| 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. |
| Keywords: fiber optic gyroscope fiber ring eigenfrequency sine wave modulation second harmonic |
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