星载大气痕量气体差分吸收光谱仪通过获取地球大气或地表反射、散射的紫外/可见光辐射,监测大气痕量气体的全球分布。为实现大视场、紫外/可见光宽波段探测、高光谱分辨率和小型化等研制目标,设计了一种前置光学系统,具体由前置望远镜和中继光学系统构成。其中,前置望远镜通过两片偏轴球面镜实现在交轨方向114°视场的覆盖;中继光学系统则通过中继反射镜、分色片及中继镜头将探测光谱(240～710nm)分为4个光谱通道,并将各谱段的光分别导入各自光谱成像系统中进行探测。设计结果表明,前置光学系统在大视场范围内、在探测的紫外/可见光宽波段内均能具有良好的成像结果,为后续的光谱成像达到高光谱分辨率提供了保障。前置光学系统整体体积紧凑,重量轻,在无摆扫前提下,满足大视场需求以及适应星载等平台的搭载需求。 On-board atmospheric trace gas differential absorption spectroscopy monitors the global distribution of atmospheric trace gases by capturing the Earth’s atmospheric or surface-reflected, scattered ultraviolet / visible radiation. In order to realize the research goal of wide field of view, wideband UV / visible light detection, high spectral resolution and miniaturization, a pre-optics system is designed, which consists of a front telescope and a relay optical system. Among them, the front telescope through the two off-axis spherical mirror to achieve the orbital direction 114 ° field of view coverage; relay optical system through the relay mirror, color separation film and relay lens will detect the spectrum (240 ~ 710nm) points For the four spectral channels, and each spectral light into their respective spectral imaging system to detect. The design results show that the pre-optics system has good imaging results in the wide range of UV / visible light in the large field of view, which guarantees the subsequent spectral imaging to achieve high spectral resolution. Pre-optics system overall compact size, light weight, without sweeping the premise to meet the needs of large field of view and adapt to the carrying platform such as spaceborne needs.