大气与环境光学学报, 2014, 9 (4): 280, 网络出版: 2014-07-30
气溶胶偏振探测仪偏振特性分析
Polarization Performance Analysis of Aerosol Polarimeter
偏振特性分析 偏振度误差 Mueller矩阵 透镜组起偏度 角度误差 polarization performance analysis polarization degree error Mueller matrix polarization degree of lens angle error
摘要
为了确定非理想透镜组偏振效应和偏振片的透过轴角度误差对气溶胶偏振探测仪偏振测量 精度的影响,首先,利用Jones矩阵描述透镜组的偏振效应,结合入射光相干矩阵推导了气溶胶 偏振探测仪前置光学透镜组的起偏度;其次,利用Mueller矩阵方法推导了综合考虑入射光 偏振态、透镜组起偏效应和偏振片透过轴方位角误差影响下的气溶胶偏振探测仪的偏振 测量误差;最后,通过计算得到透镜组的起偏度和仪器的绝对偏振度测量误差。根据 计算, 0.67 μm通道透镜组最大起偏度和仪器最大绝对偏振测量误差分别是0.3143和0.2838; 1.64 μm通道透镜组最大起偏度和仪器最大绝对偏振测量误差分别是0.3249和0.2937。结果显 示,仪器的主要误差源是非理想透镜组的偏振效应,未经标定的气溶胶偏振测量仪存在严重的测量误差。
Abstract
To understand the effect of polarization effect of the imperfect lens components and angle error of linear polarizers on polarimetric precision of the aerosol polarimeter, firstly, the polarization degree of lens component is deducted by combining the Jones matrix of lens component with the coherent matrix of incident beam. Secondly, the polarimetric error of the instrument is estimated by using Mueller matrix, considering all effects of the polarization states of incident beam, polarization effect of lens component and the azimuth errors of polarizers. Finally, the polarization degree of lens components and the polarimetric error of the instrument are specifically computed, respectively. At the channel of 0.67 μm, the maximum of polarization degree of the lens component and absolute polarimetric error of the instrument are 0.3143 and 0.2838, respectively. At the channel of 1.64 μm, the maximum of polarization degree of the lens component and absolute polarimetric error of the instrument are 0.3249 and 0.2937 respectively. It is indicated that the major error of the polarimeter arise from polarization effect of the imperfect lens components and a great error exists if the instrument is not calibrated.
代虎, 颜昌翔, 张新洁. 气溶胶偏振探测仪偏振特性分析[J]. 大气与环境光学学报, 2014, 9(4): 280. DAI Hu, YAN Chang-xiang, ZHANG Xin-jie. Polarization Performance Analysis of Aerosol Polarimeter[J]. Journal of Atmospheric and Environmental Optics, 2014, 9(4): 280.