利用积分球光源定标空间紫外遥感光谱辐射计

基于内部照明积分球的辐亮度定标方法,获得了接近理想的大面积辐亮度光源(~2%),标定了在研的空间紫外遥感光谱辐射计的亮度响应度。在假设标准灯为均匀亮度的点光源情况下,对照明因子进行了修正。同时利用两种漫反射板对此修正进行了实验研究,得到了采用两种漫反射板标定的光谱辐射计亮度响应度有很好的一致性(1%)的结论。初步的定标数据分析显示,石英卤钨灯光谱辐照度测量的相对不确定度和距离测量的不确定度是积分球定标最主要的不确定度来源,可用于紫外波段光谱辐射计的高精度辐射定标,并可以极大地降低定标不确定度。

Spectral radiance responsivity calibration of ultraviolet remote sensing spectroradiometer in space using integrating sphere

A calibration technique based on internally illuminated integrating sphere was presented,and the large area uniform(~2%) source of radiance close to ideal source was achieved,the radiance responsivities of the ultraviolet remote sensing spectroradiometer in space under development were obtained.Under the condition that FEL standard lamp was assumed to be a uniform point source,the illuminating factors of both sources were corrected,in the mean time,two kinds of diffusers were involved in the experimental research for this correction.A conclusion is given that the radiance responsivities of the spectroradiometer obtained through these two kinds of diffusers are consistent within 1%.A preliminary analysis of calibration data shows that the uncertainty of the spectral irradiance measurement in the quartz tungsten halogen lamp and the uncertainty in distance measurement are the major factors of uncertainty in the sphere calibration technique.This technique can be used to improve the precision of calibration in ultraviolet wavelength range,and the uncertainty in calibration can be reduced significantly too.