第19卷
第3期
2011年3月
文章编号1004-924X(2011)03-0552-09
光学精密工程
Optics and Precision Engineering
星载成像光谱仪杂散光测量与修正
张军强1.2，吴清文"，颜昌翔"
（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.中国科学院研究生院，北京100039）
Vol.19No.3
Mar.2011
摘要：分析了星载成像光谱仪杂散光的来源和危害，研究了杂散光对此类光谱仪光谱测量精度的影响。介绍了用点扩收函数描述成像光谱仪杂散光的原理，推导了杂散光影响矩阵和杂散光修正矩阵的求解，给出了杂散光测量和修正的具体方案，并对测量和修正精度进行了分析。实验表明，基于点扩散函数的矩阵法可实现成像光谱仪杂散光的测量和修正。像元中心波长人射时，修正后有效信号降低不足1%，杂散光信号降低至少99%；像元中心波长和非像元中心波长同时入射时，修正后像元中心波长处有效信号降低7%左右，非像元中心波长处有效信号降低25%左右，杂散光信号降低近 50%，最后，从原理上解释了杂散光修正效果受入射光波长影响的原因。
关键
调：成像光谱仅；杂散光；杂散光测量；点扩散函数
中图分类号：TP73
文献标识码：A
doi:10.3788/OPE.20111903.0552
Measurementandcorrectionof straylight of
space-bornehighresolution imaging spectrometer
ZHANG Jun-qiang'-,WU Qing-wen',YAN Chang-xiang
(l.ChangchunInstituteofOptics,FineMechanicsandPhysics，ChineseAcademy
ofSciences,Changchun130033,China;
2.GraduateUniversityof ChineseAcademyof Sciences,Beijing100039,China)
Abstract: To reduce the influence of stray lights on the spectral measurement accuracy of a High Reso-lution Imaging Spectrometer(HRIS), sources and hazards of stray lights were analyzed. Based on the Point Spread Function (PSF) theory which is usually used to describe the stray lights of HRISs,the influence matrix and the correction matrix of stray lights were discussed. The measurements and spe cific correction programs were given, and the accuracies of measurement and correction were analysed The results show that the method based on PSF can complete the measurement and correction of stray lights for the HRIS. For a pixel center wavelength incident light, the effective signal is only reduced no more than 1%, while the stray light signal is reduced at least by 99 % as compared with the raw da ta. For both pixel center wavelength and non-pixel center wavelength incident lights, the corrected signals are reduced by about 7% at the pixel center wavelength and by nearly 25% at the non-pixel center wavelength, while the stray light signal is reduced by almost 5o%. Finally, the theoretical rea-
收稿日期：2009-12-31；修订日期：2010-02-04
基金项目：国防预研基金资助项目（No.O5001SA050）