间接型光谱成像仪相对光谱响应函数标定方法  

Calibration method of relative spectral response function of indirect imaging spectrometer

作　　者：李潇潇 李娟[1] 柏财勋 畅晨光 郝雄波 文镇清 王鹏冲 冯玉涛[1] Li Xiao-Xiao;Li Juan;Bai Cai-Xun;Chang Chen-Guang;Hao Xiong-Bo;Wen Zhen-Qing;Wang Peng-Chong;Feng Yu-Tao(Key Laboratory of Spectral Imaging Technology,Xi’an Institute of Optics Precision Mechanic of Chinese Academy of Sciences,Xi’an 710119,China;University of Chinese Academy of Sciences,Beijing 100049,China;School of Physics and Optoelectronic Engineering,Shandong University of Technology,Zibo 255000,China)

机构地区：[1]中国科学院西安光学精密机械研究所,光谱成像技术重点实验室,西安710119 [2]中国科学院大学,北京100049 [3]山东理工大学物理与光电工程学院,淄博255000

出　　处：《物理学报》2024年第12期108-117,共10页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:41005019);中国科学院西部青年学者项目(批准号:XAB2016A07);中国科学院西部之光交叉团队项目(批准号:E1294301);中国科学院科研仪器设备研制项目(批准号:YJKYYQ20210021)资助的课题;陕西省自然科学基础研究计划(批准号:2019JQ-931)。

摘　　要：间接型光谱成像仪通常采用面阵探测器作为光电转换器件,探测器像元间光谱响应的不一致性会导致采集到的目标光谱失真,所以标定和修正像元间光谱响应的不一致性是提升间接型光谱成像仪光谱辐射测量精度的重要手段.本文以干涉光谱成像仪为例,分析了系统像元间相对光谱响应不一致对目标光谱辐射测量准确性的影响,提出了基于傅里叶变换调制定标源的间接型光谱成像仪全系统相对光谱响应函数测量方法,并建立了相对光谱响应函数标定的数理模型.仿真分析结果表明,理想无噪声时,像元间1%的相对光谱响应不一致性会对复原光谱造成1.02%的相对误差,经过相对光谱响应校正后,不同行复原光谱的相对误差降至0.08%.最后,仿真分析了相对光谱响应不一致性在不同光谱信噪比下的校正效果.该方法可提高间接型光谱成像仪光谱测量的准确性和一致性.In imaging spectrometers,area array detectors are usually used as photoelectric conversion devices,but the inconsistency of the spectral response among pixels can distort the collected target spectra.To improve the spectral radiometric accuracy of imaging spectrometers,calibrating and correcting the inconsistency of the spectral response among pixels is essential.The signal received by each pixel of area array detector of the indirect imaging spectrometer is usually the superposition of the target multi-spectral radiation signals or fullspectral radiation signals.Therefore,its relative spectral radiometric calibration requires measuring the spectral response of each pixel at different wavelengths on the array detector.Under the ideal conditions,the response values of each pixel in the area array detector are different,so the indirect imaging spectrometer cannot simply calibrate the relative spectral response(RSR)function between pixels by using the method of“monochromator+integrating sphere”.In this work,taking the interferometric imaging spectrometer for example,we analyze the influence of the inconsistency of the RSR among pixels on the target spectral radiation measurement accuracy,and propose a system-level RSR function measurement method for the indirect imaging spectrometer based on the Fourier transform modulation calibration source.In addition,we establish a mathematical model for calibrating the RSR function,and provide guidelines for selecting calibration system parameters such as light source,spectral resolution,and OPD sampling interval.The simulation results show that under the ideal noisefree condition,the 1% spectral response inconsistency among pixels results in a relative error of 1.02% to the recovered spectra.After RSR correction,the relative error of the recovered spectra of different rows decreases to 0.08%.Furthermore,in this work we simulate and analyse the influence of spectral signal-to-noise ratio on the calibration accuracy of the RSR function,and point out that increasing the brigh

关 键 词：间接型光谱成像仪 傅里叶变换光谱仪 相对光谱响应 定标 

分 类 号：TH744.1[机械工程—光学工程]