气溶胶偏振探测仪检偏器方位角优化  

Azimuth optimization of polarizers for the aerosol polarimeter

作　　者：代虎[1,2] 颜昌翔[1] 吴从均[1,2] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033 [2]中国科学院大学,北京100049

出　　处：《红外与激光工程》2015年第4期1243-1248,共6页Infrared and Laser Engineering

基　　金：国家高技术研究发展计划(2011AA12A103)

摘　　要：非理想透镜组的偏振效应引起偏振测量系统的测量矩阵改变,导致系统最佳配置漂移。为了最大化气溶胶偏振探测仪的信噪比,利用Jones矩阵的方法计算前置光学透镜组的起偏度,并分别以系统分析矩阵的条件数和参数Tr(BBT)为优化参数对检偏器的放置角度进行优化。经过优化,得到检偏器的最佳方位角,在670 nm通道系统分析矩阵的条件数由1.836 0降为1.689 4,在1 641 nm通道系统分析矩阵的条件数由1.977 7降为1.771 4。结果表明,两种优化方法的结果基本一致,经过优化之后两个偏振测量通道的信噪比都提升10%左右。The polarization effect of the imperfect lens components changes the analysis matrix of the polarimetry system, so the optimum configuration of the system shifts. In order to maximize SNR of the aerosol polarimeter, the polarization degree of the imperfect lens components was computed by means of Jones matrix, and the optimum azimuth angles of polarizers were found to minimize the condition number of the system analysis matrix and the parameter Tr（ BBT）, respectively. After optimizing, the optimum angles of polarizers at 670 nm channel and 1 641 nm channel were found, respectively. The condition number of the system analysis matrix reduced from 1.836 0 to 1.689 4 at 670 nm channel, while that of the system analysis matrix fall from 1.977 7 to 1.771 4 at 1 641 nm channel. It is indicated that the results of these two optimization methods are consistent, and both of the SNRs are is improved about10% at 670 nm and 1 641 nm channels.

关 键 词：偏振遥感 信噪比 条件数 奇异值分解 检偏器方位角 

分 类 号：O436.3[机械工程—光学工程] TH744[理学—光学]