多通道型偏振成像仪的偏振定标  

Polarimetric calibration of multi-channel polarimetric imager

作　　者：杨斌[1,2] 颜昌翔[1] 张军强[1] 鞠学平 

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：《光学精密工程》2017年第5期1126-1134,共9页Optics and Precision Engineering

基　　金：国家863高技术研究发展计划资助项目(No.2011AA12A103);国家自然科学基金青年基金资助项目(No.61505199)

摘　　要：为了解决多通道型偏振成像仪的偏振定标问题,提出了一种基于积分球无偏光源的偏振定标方法。通过研究偏振光束与光学器件的相互作用,推导出多通道型偏振成像仪的矢量辐射传输模型,确定了需要标定的参数。运用无偏光源标定系统的偏振效应,基于矢量辐射传输模型对中心视场绝对辐射定标系数、光学镜头起偏度和系统低频相对透过率等关键参数进行了标定,通过分析标定结果求解了系统全视场的穆勒矩阵。最后,使用可调偏振度光源验证了仪器典型视场的偏振定标精度。研究结果表明,基于无偏光源的偏振定标方法可以有效提高多通道型偏振成像仪的偏振定标效率;经偏振定标后仪器在目标偏振度低于20%时的偏振测量误差小于1%,满足大气气溶胶测量精度的要求。A polarimetric calibration method based on non-polarized light source was proposed to solve the problem of polarimetric calibration of the multi-channel polarimetric imager. Through the study of the interaction between polarized beam and optics, the vector radiative transfer model of multi-channel polarimetric imager was deduced and the calibrated parameters were determined. The key parameters such as absolute radiometric calibration coefficients of center viewing field, polarization degree of optical lenses and relative transmittance with system low frequency were calibrated based on the vector radiative transfer model by application of polarimetric effects of the system with non-polarized light source. By analyzing the calibration result, the Mueller matrix of full field of view was solved. Furthermore, the accuracy of polarimetric calibration on typical field of view was verified with a light source with variable polarization degrees. The results show that the polarimetric calibration method based on non-polarized light source can effectively improve the polarization calibration efficiency of muhi-channel polarimetric imager with the measured error of polarization less than 1% and the target degree of polarization less than 20%, thus meeting the requirements of measurement accuracy of atmospheric aerosol.

关 键 词：偏振定标 偏振成像仪 多通道 穆勒矩阵 偏振效应 

分 类 号：P415.34[天文地球—大气科学及气象学] TP706[自动化与计算机技术—检测技术与自动化装置]