Using a white diffuser to calibrate the imaging spectrometer has been a new technology developed to calibrate the imaging spectrometer recently. It has characteristics of easy realization and higher calibration accuracy. The expression of the collected signal electron number in each spectral channel of the imaging spectrometer detector pixels was deduced with the slit parallel and perpendicular to the meridional plane according to the principal of the calibration of imaging spectrometer using diffuser method in the present paper. The spectral radiornetric calibration characteristics of the imaging spectrometer was numerically analyzed under the two special slit directions. The results indicate that the slit direction has significant effect on the spectral radiometric calibration of the imaging spectrometer. The signal electron number of the same spectral channel collected by the different scene pixels is different when the slit parallels to the meridional plane, and when the pixel is closer to the standard lamp, it collects more signal electrons; the signal electron number of the same spectral channel collected by the different scene pixels doesn't change with the scene pixel position when the slit is perpendicular to the meridional plane.%采用漫反射板法定标成像光谱仪是近年来发展起来的一种辐射定标新技术,它具有实现容易、定标精度较高的特点.文章根据漫反射板定标法的原理,对于成像光谱仪狭缝平行和垂直纸面两种特殊定标状况,推导出相应的光谱辐射信号电子数采集表达式,数值分析了在此两种定标状况下成像光谱仪光谱辐射定标的特性.结果表明,成像光谱仪狭缝取向对光谱辐射定标结果有明显不同的影响,对于狭缝平行纸面情况下,不同景物像元相同光谱通道采集到的信号电子数是不同的,越靠近辐照度标准灯,采集到的信号电子数越多,反之亦然;对于狭缝垂直纸面情况下,不同景物像元相同光谱通道采集到的信号电子数是相同的.
展开▼
