高光谱短波红外地物光谱仪的光机设计

基于平场凹面光栅分光和线列阵探测器探测的最新设计方案,进行了短波红外波段地物光谱仪的光机设计。仪器采用光纤导光,两个独立单元分别探测,最大限度地简化了光学及结构设计。更换前置光学系统改变探测视场, 视场内的辐射经过前置光学系统均匀地照亮入射光纤,保证了两探测单元的视场相同。根据入射光通量、光谱分辨率和狭缝的关系确定入射狭缝的大小,仪器光谱覆盖900~2 400 nm,光谱分辨率优于12 nm,适合野外短波红外波段的探测。

Optical and mechanical design of SWIR hyperspectral field spectroradiometer

Based on flat field diffraction gratings and array detectors, the optics and structures of a Shortwave Infrared(SWIR) field spectroradiometer were designed.The spectroradiometer comprises of two cells and guides light by fiber optic to simplify the optical designs of system and structure. In order to make two cells have the same Field of View(FOV),a pre-optical system was designed to ensure the radiance of any point in the FOV for illuminating all fibers uniformly. The FOV can be changed with different pre-optical systems also. Based on the relation of the luminous flux and the spectral resolution with incidence slit, the size of slit was educed. The spectral range of radiometer is 900~2 400 nm with the resolution better than 12 nm. Experimental results show that the instrument can meet the requirements in field measurements.