摘要
通过对高速气流对光束波前扰动的分析 ,指出气动光学不均匀性可分为大尺度有序扰动和小尺度随机扰动。对于大尺度扰动 ,扰动波前可以利用波前传感器测量 ,而小尺度随机扰动 ,相干系数是一个较好的评价标准。横向剪切干涉仪 (LSI)可以实现对两种扰动的同时测量。在此基础上利用LSI对自由旋气动窗口 (FADW )的流场对光场的扰动进行了测量 ,得到了扰动光场的有序扰动的一维波前分布和随机扰动的各种尺度的分布 ,分析了不均匀尺度的产生原因。
From the analysis on wavefront aberration caused by high-speed airflow, it was found that aero-optics inhomogeneity is consisted of large-scale ordered and small-scale random inhomogeneity. With wavefront sensor, the large-scale aberration can be reconstructed. For the small-scale aberration, the coherent index is a better standard for measurement. However, the Lateral Shear Interferometer (LSI) can realize the two kinds of measurements. Therefore, the inhomogeneity of Free Vortex Dynamic Window (FVDW) was investigated by LSI, the one dimension wavefront aberration in output window was reconstructed and the random inhomogeneous scale distribution was given. Also, the main cause of inhomogeneity was discussed.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2001年第9期802-808,共7页
Chinese Journal of Lasers
