宽动态范围红外积分球辐射源的优化设计与性能测试(特邀)

为满足红外遥感器高精度等效噪声光谱辐亮度的定标要求，在原有的设计基础上改进了红外积分球辐射源研制制造工艺，满足真空低温使用要求。该积分球辐射源采用8组碳纤维石英电热管作为红外辐射介质，实现工作波段覆盖3~15 μm，可调辐射动态范围提升1倍。设计了辐射定标与测量光路，通过比对测量标准腔式黑体辐射源，实现红外积分球辐射源真空低温条件下的辐射定标。定标结果表明:红外积分球辐射源出光口法线Ф200 mm范围内的面均匀性为99.75%，±10°范围内的角度均匀性为99.81%，非稳定性为0.05%。实现了红外积分球辐射源光谱辐亮度输出等色温近线性可调功能，5 μm和10 μm辐亮度可调范围分别达到12.8 μW/(cm2·sr·nm)和1.6 μW/(cm2·sr·nm)。

Design optimization and performance test of infrared integrating sphere radiation source with wide dynamic range(Invited)

In order to meet the requirements of high-precision Noise Equivalent Spectral Radiance calibration of infrared remote sensors, the development and manufacturing process of the infrared integrating sphere radiation source were improved on the basis of the original design to meet the vacuum cryogenic use requirements. The integrating sphere radiation source used 8 sets of carbon fiber quartz electric heating tubes as the infrared radiation medium to achieve a working band coverage of 3-15 μm, and the adjustable radiation dynamic range was doubled. The radiation calibration reflective light path was designed, and the standard cavity blackbody radiation source was compared and measured to realize the radiation calibration of the infrared integrating sphere radiation source under vacuum and low temperature conditions. The calibration results show that the uniformity of the surface within the normal Ф200 mm of the infrared integrating sphere radiation source is 99.75%, the angular uniformity within ±10° is 99.81%, and the instability is 0.05%. It is the realization of the infrared integrating sphere radiation source spectral radiance output and color temperature near-linear adjustable function, 5 μm and 10 μm radiance adjustable range are up to 12.8 and 1.6 μW/(cm2·sr·nm).