为满足航空航天载荷宽谱段、小型化的探测需求,提出一种双通道曲面棱镜高光谱成像系统的设计方法,实现单台光谱成像仪可同时覆盖可见光和短波红外两个波段。可见光和短波红外两个通道共用一个离轴三反前置成像系统和部分光谱系统,通过在像面前放置的分色片进行分光,使得可见光由分色片全部反射,短波红外由分色片全部透射,反射光和透射光分别被不同的探测器接收。根据此方法设计了谱段范围为420~2500 nm的双通道光谱成像系统。结果表明,该系统结构简单,光学成像性能良好,光学总长度小于350 mm。与传统的宽谱段光谱成像方法相比,该方法可以满足系统的小型化和低成本需求,适用于航空航天遥感应用。

To satisfy the requirements of wide spectrum and miniaturization in space applications of aerospace loads, this study proposes a design method for a double-channel hyperspectral imaging system based on curved prisms. This spectrometer can realize visible and shortwave infrared spectral detection using only one device. The two channels share the same off-axis three mirror system and the partial spectrometer. Via a color separation film placed before the image plane, the visible light is completely reflected, while the short-wave infrared light is completely transmitted by the film. These channels are then detected using different detectors. Herein, the double-channel imaging spectrometer is designed that can measure from 420 to 2500 nm. The design results show that the spectrometer has a simple structure, and can achieve high resolution at a total length of <350 mm. Compared to the traditional wide spectrum imaging spectrometer, the designed spectrometer is compact and has low cost, thus making it suitable for broadband space applications.