气溶胶偏振探测仪检偏器方位角优化

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.

Azimuth optimization of polarizers for the aerosol polarimeter

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 about 10% at 670 nm and 1 641 nm channels.