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光栅色散型成像光谱仪的偏振校正方法研究

Polarization Correction for Grating Dispersive Imaging Spectrometer

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摘要

光栅色散型成像光谱仪工作在可见近红外波段,主要用于海洋水色遥感。仪器采用推扫式成像,共设置15个光谱通道,穿轨方向由1024个像元组成,总视场宽度为14.2°。成像仪的各光谱通道对入射光的偏振状态敏感,为了提高大气顶入瞳辐射的测量精度,需要了解仪器的偏振响应特性,包括偏振灵敏度和相位角。发射前搭建了偏振测试系统,测量仪器的偏振灵敏度和相位角,它们是光谱通道和视场像元的函数。其中980 nm波段的偏振灵敏度最高,平均值约为4.69%,443 nm波段的偏振灵敏度最低,平均值约为1.81%。随着视场的变化,灵敏度呈现中间低,两边高的变化规律。提出成像仪偏振响应校正方法,利用偏振状态已知的入射光进行实验验证,结果表明该方法可将成像光谱仪偏振响应引入的辐射测量不确定度降低1%~6%。

Abstract

The grating dispersive imaging spectrometer is used for ocean color remote sensing. It is operated in the visible and near infrared range. A push-broom method is applied to the instrument. 15 spectral channels and 1024 cross-track pixels comprising a total field of view of 14.2° are arranged on the focal plane. The spectral channels are sensitive to the polarization of the incident light. To improve the radiation measurement precision at the top of atmosphere, it is necessary to understand the polarization response characteristics of the instrument, including the polarization sensitivity and the phase angle. A polarization testing system is established before launching. The polarization sensitivity and the phase angle data of all spectral channels, which vary with the channel No. and the cross-track pixel, are measured. The 980 nm band has the highest polarization sensitivity and its mean of the cross-track pixels is about 4.69%, while the 443 nm band has the lowest sensitivity with a mean of about 1.81%. The sensitivity of middle field of view is lower than that at the edges in the same channel. A polarization response correction method is proposed for the imaging spectrometer. Verification experiments are performed by introducing the partially polarized light with a known polarization state. The result shows that the radiometric uncertainty caused by polarization response of the instrument can be reduced by 1%-6%.

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中图分类号:P715.6;TH766

DOI:10.3788/aos201636.0812004

所属栏目:仪器,测量与计量

基金项目:国防科工局预研项目(Y5X77329N0X)

收稿日期:2016-03-16

修改稿日期:2016-04-18

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作者单位    点击查看

王宏博:中国科学院上海技术物理研究所, 上海 200083中国科学院大学, 北京 100049
胡秀清:中国气象局国家卫星气象中心, 北京 100081
张璐:中国气象局国家卫星气象中心, 北京 100081
张崇丙:中国科学院上海技术物理研究所, 上海 200083
任百川:中国科学院上海技术物理研究所, 上海 200083
黄小仙:中国科学院上海技术物理研究所, 上海 200083中国科学院大学, 北京 100049
危峻:中国科学院上海技术物理研究所, 上海 200083中国科学院大学, 北京 100049

联系人作者:王宏博(wanghongbo@mail.sitp.ac.cn)

备注:王宏博(1987—),男,博士研究生,主要从事成像光谱仪定标技术方面的研究。

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引用该论文

Wang Hongbo,Hu Xiuqing,Zhang Lu3,Zhang Chongbing,Ren Baichuan,Huang Xiaoxian,Wei Jun. Polarization Correction for Grating Dispersive Imaging Spectrometer[J]. Acta Optica Sinica, 2016, 36(8): 0812004

王宏博,胡秀清,张璐,张崇丙,任百川,黄小仙,危峻. 光栅色散型成像光谱仪的偏振校正方法研究[J]. 光学学报, 2016, 36(8): 0812004

被引情况

【1】康晴,袁银麟,李健军,杨伟锋,范慧敏,钱鸿鹄,吴浩宇,郑小兵. 大气同步校正仪的滤光片筛选方法与精度验证实验研究. 光学学报, 2017, 37(3): 312003--1

【2】李寒霜,李博,王淑荣. 空间紫外遥感光谱仪器偏振特性研究. 光学学报, 2018, 38(1): 112006--1

【3】朱丹彤,沈宏海,杨名宇,陈成,南童凌. 编码孔径成像光谱仪中编码元形变的分析校正. 激光与光电子学进展, 2018, 55(6): 61201--1

【4】吉长东,孙道中,马传宁. 基于6S模型NPP VIIRS数据快速大气校正及精度评估. 激光与光电子学进展, 2018, 55(8): 80101--1

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