高精度辐射定标技术是现代空间遥感的主要支撑技术之一。基于滤光片辐射计的新型光辐射标准探测器在野外、机载和星上高精度辐射定标中具有广阔的应用前景。温度特性是工程应用中影响标准探测器绝对精度和稳定性的一项关键因素。在20～60 ℃的宽温度范围内,对基于硅陷阱探测器的滤光片辐射计温度特性进行了系统测试和定量研究,在所获取的完备的实验数据基础上设计并研制了一套精密温控系统。实验结果显示在加入精密温控后,滤光片辐射计的温度系数降低了约一个数量级,从而有利于在不同温度工作平台上保持标准探测器的高精度。

The high-precision radiometric calibration technology is one of the primary technologies of modern remote sensing. The trap-based filter radiometer is a key unit of new optical radiometric standard detectors, and has potential applications in radiometric calibration of field, air-borne and space-borne sensors. The temperature characteristics of trap-based filter radiometer are a primary factor of affecting its precision and stability. Temperature coefficients of standard detectors are systematically studied within large temperature range (20～60 ℃) and at different wavelengths. A temperature controlling device is designed and is used to stabilize the temperature of trap-based filter radiometer with high precision. The temperature controlling device effectively decreases the temperature coefficient of trap-based filter radiometer by nearly one order of magnitude. The results will provide a reliable reference for the future design of standard detectors on-board different platforms and under various temperature environments.