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傅里叶变换光谱仪的红外探测器非线性校正

A Nonlinearity Correction Method for the Response Produced by the Infrared Detectors of the Fourier Transform Spectrometers

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摘要

针对傅里叶变换光谱仪的红外探测器非线性,提出了一种适用于干涉图直流信号值缺失情况的非线性校正方法。针对需要实施校正的光谱计算基于带外虚假成分的相对校正因子,结合无需实施校正的光谱计算一致性校正因子。实验结果表明,实施本文所提非线性校正方法后,辐射定标曲线的线性拟合优度可以由校正前优于0.99提升至0.9999以上,且辐射标定后的各通道的辐亮度绝对偏差均不超过0.15 mW·m -2·cm·sr -1。相比已有的校正方法,所提方法避免了对干涉图直流信号的依赖性,但增加了对多个温度点黑体辐射定标数据的依赖性。一旦得到一致性校正因子后,在探测器稳定工作的前提下,可以实施对任一光谱图的非线性校正。

Abstract

In this study, we propose a nonlinear correction method to deal with the nonlinear response produced by the infrared detectors of the Fourier transform spectrometers when the direct current (DC) signal of the interferogram is not available. Initially, the relative correction factor is derived based on the out-of-band spectrum of the spectrum that is to be corrected, and the consistency correction factor is subsequently calculated by the spectra without correction. The experimental results show that the goodness of the linear-fit curve in case of radiometric calibration can be improved from more than 0.99 to more than 0.9999 after the implementation of the proposed nonlinear correction method; further, the absolute bias of the radiance of each channel is observed to become less than 0.15 mW·m -2·cm·sr -1 after radiometric calibration. When compared with the existing correction methods, the proposed method avoids the demand from the direct-current(DC) signal of the interferogram. However, the proposed method is considerably dependent on the blackbody spectra measured at multiple temperatures during radiometric calibration. After obtaining the consistency correction factor, nonlinear correction can be achieved for any spectrum as long as the detector operates in a stable manner.

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中图分类号:TP73

DOI:10.3788/AOS202040.0530002

所属栏目:光谱学

基金项目:上海市自然科学基金;

收稿日期:2019-10-22

修改稿日期:2019-11-26

网络出版日期:2020-03-01

作者单位    点击查看

郭玲玲:上海卫星工程研究所, 上海 201109
赵其昌:上海卫星工程研究所, 上海 201109
杨勇:上海卫星工程研究所, 上海 201109
何军:上海卫星工程研究所, 上海 201109
张扬:上海卫星工程研究所, 上海 201109

联系人作者:郭玲玲(ustcllg@foxmail.com)

备注:上海市自然科学基金;

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引用该论文

Guo Lingling,Zhao Qichang,Yang Yong,He Jun,Zhang Yang. A Nonlinearity Correction Method for the Response Produced by the Infrared Detectors of the Fourier Transform Spectrometers[J]. Acta Optica Sinica, 2020, 40(5): 0530002

郭玲玲,赵其昌,杨勇,何军,张扬. 傅里叶变换光谱仪的红外探测器非线性校正[J]. 光学学报, 2020, 40(5): 0530002

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