基于自发参量下转换的高精度自校准辐射基准源是目前卫 星遥感定标的研究热点。介绍了双通道自校准辐射计的工作原理并搭建了实验装置,展开了与传统 辐亮度标准探测器的比对实验验证。采用736.9 nm激光导入积分球的单色均匀辐亮度光源,将双通道 自校准辐射计和辐亮度标准探测器分别对积分球出口辐亮度进行探测,测得绝对辐亮度分 别为4.69×10－9 W/(sr·mm2)和5.19×10－9 W/(sr·mm2), 二者之间的相对偏差为9.63%,验证了研制的双通道自校准辐射计的原理可行性。

High-precision self-calibration radiation reference source based on spontaneous parametric down-conversion is the research hotspot of satellite remote sensing calibration. The principle of two-channel self-calibration radiometer was introduced, and a set of experimental device was established. The experimental verification was carried out by comparing with traditional radiometric standard detector. Monochromatic uniform radiance light source with 736.9 nm laser was used by integrating sphere, then the radiance at the outlet of integrating sphere was detected by two-channel self-calibration radiometer and radiance standard detector respectively. The measured absolute radiances results were 4.69×10－9 W/(sr·mm2) and 5.19×10－9 W/(sr·mm2), and the relative deviation was 9.63%. The feasibility of the principle of two-channel self-calibration radiometer was verified.