机载热红外高光谱成像仪的光谱性能测试与初步应用

介绍了机载热红外高光谱成像仪样机的低温光谱仪设计特点，为了检测系统的光谱识别能力，在实验室开展了详细的光谱性能测试。为满足气体探测对超高光谱精度的需求，提出了采用CO₂激光器结合高精度单色仪的方法应用于色散型高光谱成像系统。在实验室对氨气气体进行了准确的红外吸收光谱测试，表明系统可用于气体探测及识别。在此基础上，开展了飞行试验，应用结果表明热红外高光谱可以有效开展城市典型建筑物分类、工业化学气体排放种类和形态监测等应用，特别是后者是目前其它光学遥感手段尚不具备的。以上研究和试验结果表明机载热红外高光谱成像仪已经具备了业务应用能力，后续将在仪器辐射定量化精度的提升方面进一步开展研究工作。

Laboratory calibration and application of the airborne thermal infrared hyperspectral imager (ATHIS)

The cryogenic spectrometer for the airborne thermal infrared hyperspectral imager (ATHIS) was designed in this paper. In order to detect the spectral recognition capability of the ATHIS, detailed spectral characteristics tests were carried out in the laboratory. The method of CO₂ laser combined with high precision monochromator was proposed to achieve the absolute spectral calibration accuracy of 0.8 nm. Methane gas was tested in the laboratory, and the results show that methane gas could be accurately identified. Twice flight tests of the ATHIS was carried out based on those experiments. The data processing results show that thermal infrared hyperspectral imager can effectively carry out classification and identification of typical urban buildings and effective monitoring of industrial chemical gas emissions. The above preliminary application shows that the ATHIS has excellent spectrum recognition power, and the primary business application prospect. The follow-up instrument will carry out the researches on the enhancement of radiation quantification.