Design of Double-Channel Hyperspectral Imaging System Based on Curved Prism

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.