光纤位移干涉仪测高速漫反射面速度误差分析  

Error Analysis for the Velocity Measurement by Fiber Displacement Interferometer on High Speed Diffuse Surface

作　　者：吴建荣[1] 李泽仁[1] 王德田[1] 刘寿先[1] 

机构地区：[1]中国工程物理研究院流体物理研究所

出　　处：《光电工程》2008年第8期35-40,144,共7页Opto-Electronic Engineering

基　　金：中国工程物理研究院基金资助项目(20050434)

摘　　要：首次从理论上分析基于单模光纤的位移干涉仪用于高速漫反射面速度测量的相位误差,包括来源和大小及其与系统各参量的关系。计算了光束从光纤出射,经漫反射面反射,再耦合进单模光纤的光场表达式。结果表明,相位误差的来源包括两部分:光束传输衍射效应及漫反射面表面的随机相位特性。由相位误差引起的位移和速度相对误差都在10-6量级,并且同时采用VISAR和光纤位移干涉仪来测量爆轰加载下铜飞片的速度轨迹。实验结果表明,单模光纤位移干涉仪的实际测量精度可以和VISAR相当,证明了单模光纤位移干涉仪用于高速漫反射面速度测量的可行性。The phase error for the velocity measurement was analyzed by means of displacement interferometer in high speed diffuse surface, including the error source, its range and its relationship with the system parameters. The expression for the optical field distribution for the optical signal was calculated. The result suggests that the sources of the phase error include two parts： the diffraction effect and the random phase modulation by the diffuse surface. The error range for the displacement and velocity from the phase error is 10^-6. Furthermore, we measured the velocity profile for the copper plates under explosive loading by the method. Compared with results from VISAR, experimental result indicates that the fiber displacement interferometer can accomplish the same order of precision with the VISAR.

关 键 词：激光测速 光纤位移干涉仪 相位误差 光束传播 漫反射面 

分 类 号：O436.1[机械工程—光学工程]