大气相干长度测量中几个关键技术指标的分析  

Several critical qualifications in measurement of atmospheric coherence length

作　　者：许文强[1,2] 宗飞[2] 强希文[2] 孙学金[1] 

机构地区：[1]解放军理工大学气象海洋学院,江苏南京211101 [2]西北核技术研究所,陕西西安710024

出　　处：《应用光学》2013年第3期469-472,共4页Journal of Applied Optics

基　　金：国防科技基础研究基金项目

摘　　要：为规范大气相干长度的测量,保证测量数据的准确性,通过对大气相干长度测量中采样频率、采样时长、曝光时间等关键问题的分析,并结合国内外相关研究成果,确定了差分像运动测量仪的采样频率应不低于100Hz、采样时长应不短于20s,单帧图像曝光时间应不长于沿测量光路的格林伍德时间常数,样本数应不少于2 000帧。In order to ensure the accuracy in measurement of atmospheric coherence length, it is necessary to specify qualifications of measurement. The qualifications of differential image mo- tion monitor are determined through analysis of several critical problems such as sampring fre- quency, spampling time and exposure time in measurement of atmospheric coherence length, and combining with the result of domestic and foreign research, it is ensured that the sampling frequency should not be lower than 100 Hz, the sampling time should not be shorter than 20 s, the exposure time of single frame image should not be longer than the Greenwood time constant along with the measuring beam path, and the number of samples should not be less than 2 000 frames.

关 键 词：大气光学 技术指标 差分像运动测量法 大气相干长度 

分 类 号：O437[机械工程—光学工程] TN246[理学—光学]