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基于积分球原理,提出了一种利用积分球进行光谱辐亮度响应度定标的新方法,消除了利用积分球定标的传统方法中由于漫反射板的双向反射率分布函数(BRDF)的测量不确定度大对定标精度的影响,极大地提高了定标精度。利用该方法标定了在研的空间遥感临边成像光谱仪原型样机的光谱辐亮度响应度,分析了定标不确定度,定标合成不确定度为2.6%。将该方法的定标结果与采用标准灯联合漫反射板的定标结果进行了分析比对,结果表明,二者在3%以内相符。引起两种定标结果偏差的主要原因是漫反射板BRDF测量的不确定度。
Based on the principle of integrating sphere, a new method of calibrating spectral radiance responsivity using integrating sphere is proposed, which eliminates the traditional method of integrating sphere calibration, which is due to the measurement of birefringence reflectance distribution function (BRDF) The impact of large uncertainty on the calibration accuracy greatly improves the calibration accuracy. The method was used to calibrate the spectral radiance responsivity of the prototype of the space-borne remote sensing imaging spectrometer. The uncertainty of calibration was analyzed. The uncertainty of calibration was 2.6%. The calibration results of this method were compared with those of standard diffuse reflectors. The results showed that both of them were within 3%. The main reason for the deviation of the two calibration results is the uncertainty of the BRDF measurement of diffuse reflectors.