热红外谱段是对地观测高光谱遥感中非常有用的波段, 受限于技术发展, 热红外谱段的高光谱成像系统在国内的空间光电系统中并不多见, 近年来在国家相关部门的支持下发展迅速, 取得了较大进展。结合“十二五”期间研制的机载热红外高光谱成像仪系统, 建立了信号流模型, 对系统背景辐射进行了建模仿真, 并对红外焦平面组件等效暗电流进行了分析测量, 在此基础上得出了影响系统的探测灵敏度的关键因素, 给出了系统设计低温光学100 K制冷的设计依据。机载热红外高光谱成像仪研制完成后, 还进行了探测灵敏度实际测量并与仿真结果进行了对比分析, 对未来进一步发展热红外高光谱成像技术积累了重要数据。

The thermal infrared spectrum is a very useful band for earth-observation hyperspectral remote sensing. Due to the limitation of technology, the hyperspectral imaging system of thermal infrared spectrum in domestic space photoelectric system is not very common, but it has developed quickly and made great progressunder the support of national related department in recent years. Based on the airborne thermal infrared hyperspectral imager′ developing during the Twelfth Five-Year Plan period, the signal flow model of the system was established in this paper. The background radiation of the system was modelled and simulated, the dark current of the infrared focal plane component was analyzed and measured, and on this basis the factors affecting the detection sensitivity of the system were analyzed, the design rules of the cryogenic optical 100 K for the cryogenic temperature was presented. After the completion of the airborne thermal infrared hyperspectral imager, the comparison between the actual detection sensitivity and the simulation results was carried out. The results show that the system has good compliance and has accumulated important data for the further development of thermal infrared hyperspectral imaging technology.