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为了解决多光谱成像系统的轻小型设计难点,采用单探测器多谱段成像方案进行了同时刻四谱段成像系统的光学系统设计。分光原理为,在物镜组前方设置四片楔形滤光棱镜,并在棱镜表面镀上透过不同谱段的透过薄膜;物体辐射经过棱镜后不同谱段的辐射发生不同方向的偏折,即在焦平面的不同位置形成了分离的光谱像。设计过程中,采用渐晕的方法解决谱段间的重叠问题。设计得到的光学系统波段数为4,工作波长为8.20~8.60μm、9.40~9.80μm、10.60~11.20μm及11.20~12.20μm,焦距为55 mm,全孔径为80 mm,光学系统的弥散圆直径小于40μm,并分析了系统的像差特性。分析结果表明,该系统具有良好的成像质量,满足多谱段成像要求。
In order to solve the small and light design difficulty of multispectral imaging system, single-detector multi-spectral imaging scheme was used to design the optical system of the four-band imaging system at the same time. The principle of spectroscopy is that four wedge-shaped filter prisms are arranged in front of the objective lens group, and the surface of the prism is coated with a transparent film passing through different spectral sections; the radiation of different spectral sections of the object after the prism is deflected in different directions, that is A separate spectral image is formed at different positions in the focal plane. In the design process, the method of vignetting is used to solve the problem of overlap between spectrum segments. The designed optical system has a wavelength band of 4, operating wavelengths ranging from 8.20 to 8.60μm, 9.40 to 9.80μm, 10.60 to 11.20μm and 11.20 to 12.20μm with a focal length of 55 mm and a full aperture of 80 mm. The diameter of the optics circle Less than 40μm, and analyzed the aberration characteristics of the system. The analysis results show that the system has good imaging quality and meets the requirements of multi-spectral imaging.