夜间遥感场地替代定标的微光光谱仪设计与试验分析

Design and Experimental Analysis of Low-level Light Spectrometer for Nighttime Remote Sensing Sites Vicarious Calibration

针对目前传统的地物光谱仪对光信号强度要求较高,只能白天使用,无法在夜间使用而导致夜间遥感在轨辐射定标不确定度较高的问题,提出一种将传统光谱仪的CCD(Charge-Coupled Device)探测器与像增强器直接耦合提升光谱仪低照度条件下信息获取能力的技术方案。基于该技术方案的光谱仪可有效实现地面目标光谱信息的夜间测量。相关测试试验结果表明:在入射光源只有月光和星光的条件下,该微光光谱仪可有效实现对地面目标光谱信息的测量,且性能良好稳定,未来可应用于夜间遥感定标、夜间目标光谱信息获取等应用领域,为夜间遥感在轨定标精度的提升奠定技术基础。

Traditional ground object spectrometers have high requirements for optical signal intensity and can only be used during the day but cannot be used at night, which leads to high uncertainty of on-orbit radiometric calibration of remote sensing at night. A technical solution is proposed to enhance the information acquisition capability of the spectrometer under low illumination conditions by directly coupling the traditional spectrometer’s CCD(Charge-Coupled Device) detector with the image intensifier. Based on this technology scheme, the spectrometer could effectively measure ground targets’ spectral information at night. The experimental results show that the low-level light spectrometer can effectively measure the spectral information of the ground target with good and stable performance under the condition of moonlight and starlight. And the spectrometer can be applied to night remote sensing calibration, night target spectral information acquisition, and other application fields, laying a technical foundation for improving the accuracy of night remote sensing calibration in orbit.