| 引用本文: | 陈锴,徐德刚,李吉宁,等.临近空间飞行器等离子体鞘套的太赫兹波穿透特性.[J].国防科技大学学报,2022,44(1):55-62.[点击复制] |
| CHEN Kai,XU Degang,LI Jining,et al.Terahertz wave propagation characteristics in the plasma sheath of near space vehicle[J].Journal of National University of Defense Technology,2022,44(1):55-62[点击复制] |
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| 临近空间飞行器等离子体鞘套的太赫兹波穿透特性 |
| 陈锴1,2,徐德刚1,2,李吉宁1,2,钟凯1,2,姚建铨1,2 |
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(1. 天津大学 精密仪器与光电子工程学院, 天津 300072;2. 天津大学 光电信息技术教育部重点实验室, 天津 300072)
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| 摘要: |
| 临近空间高超声速飞行器再入过程中会产生等离子体鞘套,干扰电磁波对飞行器的探测。针对这一问题,对典型临近空间飞行器模型进行建模,模拟其再入过程中不同飞行工况下的流场分布。基于流场分布对等离子体参数分布进行建模,利用散射矩阵方法从理论上对太赫兹波在等离子体鞘套中的传输特性进行计算。计算结果表明高频太赫兹波能够有效穿透等离子体鞘套。在实验室环境下进行太赫兹主动成像实验,实验结果显示等离子体对于太赫兹主动成像结果几乎无影响。仿真和实验结果初步证明了太赫兹技术用于高超声速飞行器探测的潜力,这对于国防安全具有重要意义。 |
| 关键词: 太赫兹波 等离子体 传输特性 主动成像 |
| DOI：10.11887/j.cn.20220109 |
| 投稿日期：2021-01-07 |
| 基金项目:国家部委基金资助项目(6140415010202) |
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| Terahertz wave propagation characteristics in the plasma sheath of near space vehicle |
| CHEN Kai1,2, XU Degang1,2, LI Jining1,2, ZHONG Kai1,2, YAO Jianquan1,2 |
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(1. School of Precision Instruments and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China;2. Key Laboratory of Opto-Electronic Information Technology (Ministry of Education), Tianjin University, Tianjin 300072, China)
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| Abstract: |
| Plasma sheath formed during the reentry of near space hypersonic vehicle will interfere the electromagnetic wave detection. In order to solve this problem, the model of the typical near space vehicle was built, and the flow field distribution under different flight conditions during the reentry process was simulated. Based on the flow field distribution, the plasma parameter distribution was modeled, and the transmission characteristics of terahertz wave in the plasma sheath were theoretically calculated by using the scattering matrix method. The results show that high frequency terahertz wave can penetrate plasma sheath effectively. In addition, terahertz active imaging experiments were carried out in the laboratory environment. The experimental results show that the plasma exerts little effect on the terahertz active imaging results. The simulation and experimental results preliminarily prove the potential of terahertz technology for hypersonic vehicle detection, which is of great significance for national defense. |
| Keywords: terahertz wave plasma propagation characteristics active imaging |
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