日光诱导叶绿素荧光超光谱探测仪偏振响应抑制与测试  

Suppression and Measurement of Polarization Response of the Solar-induced Chlorophyll Fluorescence Imaging Spectrometer(SIFIS)

作　　者：崔程光 安宁[1] 于宗伟 张生杰 王伟刚[1] 徐彭梅[1] CUI Chengguang;AN Ning;YU Zongwei;ZHANG Shengjie;WANG Weigang;XU Pengmei(Beijing Institute of Space Mechanics&Electricity,Beijing 100094,China)

机构地区：[1]北京空间机电研究所,北京100094

出　　处：《航天返回与遥感》2022年第6期85-96,共12页Spacecraft Recovery & Remote Sensing

基　　金：国家重大科技专项工程。

摘　　要：为提高陆地生态系统碳监测卫星日光诱导叶绿素荧光超光谱探测仪(简称超光谱探测仪)植被荧光探测精度,需降低光学系统偏振灵敏度,即对超光谱探测仪偏振响应进行抑制。文章利用斯托克斯-穆勒体系对超光谱探测仪光学系统进行偏振特性分析,对前置光学系统引起的偏振响应进行理论分析,从而确定采用双巴比涅消偏器实现全光路消偏的方案;同时对偏振测试系统中主要误差源(即测试系统残余偏振度)的影响进行理论分析,建立了“积分球光源+扩束系统+偏振元件”的低残余偏振度的偏振测试系统,对超光谱探测仪偏振灵敏度进行了测试。测试结果表明,超光谱探测仪偏振度为0.65%,满足高精度植被荧光探测需求。In order to improve the accuracy of vegetation fluorescence detection by the Solar-Induced Chlorophyll Fluorescence Imaging Spectrometer(SIFIS), the polarization sensitivity of the optical system should be reduced. In particular, the polarization response of SIFIS should be suppressed. In this paper, the Stokes-Muller theory is used to analyze the polarization characteristics of the optical system with a double Babinet depolarizer. At the same time, the influence of the polarization residual degree of the polarization test is analyzed, which is the main error source. And the polarization test system with low polarization residual degree is established, including an integrating sphere light source, a polarization element and a beam expander system.Then the polarization sensitivity of SIFIS is tested, and the results show that the polarization degree of SIFIS is 0.65%, which can meet the requirements of high-precision vegetation fluorescence detection.

关 键 词：偏振抑制 偏振灵敏度测试 超光谱 荧光探测 星载成像仪 陆地生态系统碳监测卫星 

分 类 号：P407[天文地球—大气科学及气象学]