用漫反射板法标定成像光谱仪时不仅要考虑定标仪器的精度,还要了解成像光谱仪几何参数和仪器参数对标定结果的影响.本文根据漫反射板法标定成像光谱仪原理,推导了以定标角度、距离等几何参数和成像光谱仪仪器参数为自变量的探测器沿景物像元方向采集到的信号电子数变化表达式,据此对几何参数和仪器参数对标定的影响进行了分析.结果表明,F/#分别为3和4,入瞳口径为0.1～0.2m,辐照度标准灯照射距离取0.5～2m,且其测量精度为1 mm时,只要照射角小于12°,满足0.5°的测量精度,都可以使探测器采集到的信号电子数相对变化小于1％,从而可发挥标准探测器精度高的优势,使利用漫反射板的定标方法实现较高的精度.%The calibration of an imaging spectrometer by using the diffuser method should consider not only the accuracy of calibration instruments,but also the effects of instrument and geometric parameters from the imaging spectrometer on calibration results. According to the calibration principle of imaging spectrometer using the diffuser method, this paper deduces the expression of the collected signal electron number in each spectral channel of the imaging spectrometer by taking the parameters as self-variables, and it analyzes the effects of the incident angle of standard lamp, the distance of standard lamp to the diffuser, the slit direction and the observation incident angle of the imaging spectrometer on the electron number collected by the detector pixels. The results show that when the F number is set to be 3 and 4, the entrance pupil in 0.1-0. 2 m, the standard lamp illuminating angle less than 12° and the distance of the standard lamp in 0. 5 -2 m, the change of the signal electron number can be less than 1%. It satisfies the accuracy need of the calibration by using the diffuser method.
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