Technical characteristics and application analysis of wide-swath thermal infrared imager

Thermal infrared remote sensing plays an important role in the field of optical remote sensing because it can obtain the radiant brightness temperature of ground objects day and night and provide basic data for quantitative applications such as surface temperature and evapotranspiration. In order to improve the observation efficiency of long-wave infrared remote sensing, after years of pre-research and model engineering development and test verification, a 360° unidirectional uniform rotation scanning mirror is set in front of the optical lens, a small F-number optical lens is configured, and a high-sensitivity quadrangular integrated long-line TDI long-wave detector is set. The on-orbit application of a wide thermal infrared imager with a spatial resolution of 100m, NEΔT better than 0.1K and width better than 1500km in four long wave infrared spectrum segments of 8μm～12.5 μm has been realized, which makes the comprehensive index of thermal infrared optical load in China reach the international advanced level. The stability of the high and low temperature blackbody of the large surface source can reach 20mK/25min, and the temperature difference can reach 21℃, which provides a guarantee for the high-precision radiometric calibration and quantitative application in orbit. The payload can cover most of the regions in China in one day and the whole world in two days, which will greatly improve the application efficiency of thermal infrared remote sensing data, and provide powerful data support for thermal pollution emission monitoring, environmental assessment of nuclear power plants, water temperature monitoring of key rivers and lakes/coastal areas, drought monitoring, fire monitoring, etc.