Design of Spaceborne Large Field of View Multispectral Imaging Optical System
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摘要: 大视场、多通道、小型化已成为星载测绘光学系统的迫切需求。根据上述需求，提出了先用视场分光再用窄带分色片分光的设计方案、并构建了自动消遮挡和轻小型化优化函数。设计了一款主、次、三镜均为球面的离轴三反四通道光学系统，其焦距360 mm、相对孔径为1/6、视场角13°×5°、工作波段0.4~1.1 m、地面像元分辨率5 m、全视场畸变小于5%。加工、装调后的整机系统实测MTF（Modulation Transfer Function）曲线在奈奎斯特频率100 lp/mm处均大于0.25，同时系统所占空间面积仅为245 mm×423 mm、整机重量仅13.82 kg，从而实现了系统大视场、无遮挡、多通道、体积包络的小型化。Abstract: A large field of view, multi-channel, lightness, and miniaturization have all become critical requirements for satellite-borne surveying and mapping optical systems. According to the above-mentioned requirements, a design method that uses the field of view to split light and then uses a narrowband dichroic plate to split light is proposed, and an optimization function for automatic de-occlusion, lightness, and miniaturization is constructed. This method was used to design an off-axis three-mirror four-channel optical system with spherical primary, secondary, and tertiary mirrors. For the ground image, the focal length was360mm, relative aperture was 1/6, field of view was 13°×5°, and working waveband was 0.4– 1.1m. The element resolution was 5 m, and the distortion of the full field of view was less than 5%. The entire system installation and adjustment were completed according to the tolerance analysis results. After processing and installation, the measured modulation transfer function (MTF) curve of the100 lp/mm entire system was greater than 0.25. The system had good image quality and it occupied only 245 mm×423 mm and the entire weight was only 13.82 kg. This shows that the system had excellent characteristics of a large field of view, no obstruction, lightness, and miniaturization.
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Key words:
- space remote sensing /
- off-axis three-mirror /
- optical design /
- large field
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表 1 光学系统指标
Table 1. Parameters of optical system
Parameter Focal length 360 mm Field of view 13°×5° F/# 6 Wave length 0.45-1.1 μm 
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表 2 各光谱通道指标参数
Table 2. Parameters of each spectral channel
Channel 1 Channel 2 Channel 3 Channel 4 Wavelength/nm 450±5 650±3 820±3 1020±5 ωY 6°-7.25° 7.25°-8.5° 8.5°-9.75° 9.75°-11° ωX ±6.5° ±6.5° ±6.5° ±6.5°
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表 3 初始结构参数
Table 3. Parameters of initial structure
Radius/mm Distance/mm Conic Primary mirror -2300 -765 1 Secondary mirror -884 887 12.4 Third mirror -309 -144 -0.449
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