时分复用激光干涉测速技术研究

彭其先; 李泽仁; 王德田; 刘俊; 陈光华; 刘寿先; 邓向阳

doi:doi:10.3788/gzxb20124102.0190

光子学报, 2012, 41 (2): 190, 网络出版: 2012-03-09

时分复用激光干涉测速技术研究

Time-divided Laser Interfence Velocimetry

论文大纲

彭其先 ^*李泽仁王德田刘俊陈光华刘寿先邓向阳

作者单位

中国工程物理研究院流体物理研究所冲击波物理与爆轰物理实验室,四川绵阳 621900

干涉差频速度位移光纤 Interference Beat frequency Velocity Displacement Fiber

摘要

为了探索和发展瞬态激光干涉测量技术，本文从理论上对激光差频干涉测速度技术进行了分析，并对该技术的应用基础和发展前景进行了剖析.基于对该技术中关键技术的分析、讨论，提出了时分复用激光干涉测速技术的概念.充分利用了激光差频干涉测速技术中的延迟时间τ，在时间段0~τ和τ之后，激光干涉分别体现的是测位移技术和测速度技术，从而可较好地确定冲击与爆轰等物理过程中的第一冲击前沿的速度值(解决条纹丢失的不确定性); 同时在硬件要求不太高(降低对记录用示波器等的带宽和采样率的要求)的情况下，保证有较高的速度测量上限.结合爆轰与冲击物理过程特性的考虑，通过选择合适的干涉测试技术参量，设计并建立了光纤时分复用激光干涉测速系统，进行了时分复用激光干涉测速技术的初步应用研究，获得了较好的应用结果，从而验证了该技术的有效性.

Abstract

For the further development and exploring the instantaneous laser velocimetry, the laser beat frequency velocity interferometry is analyzed and its applications and future development are discussed. Based on the key technology of it, the concept of time-divided laser velocity interferometry is proposed. It uses the time delay τ in the laser beat frequency velocity interferometry, in which the interferometer is keyed to measure, respectively, the displacement and velocity in the time range 0~τ and above τ, to determine the velocity of the first front edge in the shock process (i.e., solve the uncertainty of fringe losing). In addition, it provides a higher upper bound of velocity measuring with lower hardware requirement (i.e., with lower requirement for the bandwidth and sampling of the oscilloscope). Combining with the consideration of the property of shocking and explosion process, the parameters are selected properly, the fiber time-divided laser velocity interferometer is designed, its primary applications are investigated, and the application results show its effectiveness.

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彭其先, 李泽仁, 王德田, 刘俊, 陈光华, 刘寿先, 邓向阳. 时分复用激光干涉测速技术研究[J]. 光子学报, 2012, 41(2): 190. PENG Qi-xian, LI Ze-ren, WANG De-tian, LIU Jun, CHEN Guang-hua, LIU Shou-xian, DENG Xiang-yang. Time-divided Laser Interfence Velocimetry[J]. ACTA PHOTONICA SINICA, 2012, 41(2): 190.

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