小型Offner色散型高光谱成像系统设计

Design of a Small Offner Dispersive Hyperspectral Imaging System

针对传统型色散成像光谱仪较复杂的准直物镜结构,讨论了轻量小型化的可能,研究了曲面棱镜的色散和像差特性,曲面棱镜-Offner系统色散型光谱仪的的设计原则,得出了初始结构的设计方法,并设计了可见光/近红外光谱段的高光谱成像系统,其中2块曲面棱镜材料都为H-F2,用来提高光谱分辨率和成像质量,并用Zemax光学设计软件进行了系统优化,在400~800nm的谱段内,光谱分辨率小于4nm,全光谱范围内,色畸变小于0.082个像元,谱线弯曲小于0.068个像元。

Aiming at the complex structure of the traditional type collimating lens of dispersion imaging spectrometer,in this paper,the possibility of miniaturization of light weight was discussed;the dispersion and aberration characteristics of the curved prism and the design principle of the dispersion prism spectrometer based on the curved prism-Offner system were studied;the design method of the initial structure was obtained and a hyperspectral imaging system with a visible/near-infrared spectrum segment was designed. The materials of two curved prisms were H-F2 used to improve the spectral resolution and image quality. The system optimization was performed by using Zemax optical design software. Spectral resolution was lower than 4 nm in the 400~800 nm spectral band and less than 0.082 pixels in the full spectral range as well as less than 0.068 pixels in spectral line bending.