Design and comparison of lightweight and compact imaging spectrometer based on unmanned aerial vehicle

To meet the application requirements of UAV hyperspectral remote sensing, a lightweight and compact imaging spectrometer optical system with large relative aperture and excellent spectroscopic imaging performance is studied. Various spectroscopic imaging systems with convex grating, concave grating and plane grating as spectroscopic elements are designed respectively, with the same technical indicators, working band of 400-1000nm, F number of 2.5, slit length of 10mm, and spectral resolution of 5nm. A total of 10 different optical systems are designed, the volume and imaging performance of each system are comprehensively compared, and the advantages and disadvantages of each optical system are analyzed. It is pointed out that the Wynne-Offner spectroscopic system, the Immersed Offner spectroscopic system, the improved Wynne-Dyson spectroscopic system and the Distributed Dyson spectroscopic system have the characteristics of small size and excellent imaging performance, which are suitable for UAV platforms.