基于空间光调制器的光谱可调光源定标

基于空间光调制器的光谱可调光源是一种新型的定标光源,旨在实现定标光源与观测场景光谱匹配的定标新模式,进一步提高光谱定标和辐射定标精度。针对空间光调制器非光敏的特点以及这种新型光源特殊的工作模式,采用"激光光源+光谱仪"进行了光谱预定标和光谱精细定标,采用"标准灯-参考板+光谱仪"进行了辐射定标,实现了对该光源系统470~945 nm范围的光谱及辐射定标。不确定度分析结果表明,波长定标的不确定度优于0.2 nm,辐射定标的不确定度优于3.1%(k=1)。

Calibration of Spectrally Tunable Source Based on Spatial Light Modulator

The spectrally tunable source based on spatial light modulator （SLM） is a novel source applying to remote sensor calibration, which aimed at achieving a new calibration model about spectral matching between calibration source and observed scene to further improve spectral and radiometric calibration accuracy. According to the non-photoconductive characteristic of the digital micromirror device and the special operating modes of the source, a spectral calibration scheme based on laser wavelengths and field spectroradiometer was adopted for coarse and precise spectral calibration, and a temporary radiometric calibration method based on lamp-plaque system and field spectroradiometer was adopted. Whereafter, this source was calibrated at 470-945 nm band spectrally and radiometrically. The uncertainty analysis showed that the accuracy of spectral calibration was better than 0.2 nm, and the combined radiometric calibration uncertainty was less than 3.1% （k=l）.