为了克服太空环境的复杂性，满足航天工程的空间使用要求，研制一款2 500万像素宽光谱共焦成像的微型星载相机光学系统。该系统适应卫星发射和在轨道运行的恶劣环境，具有抗冲击震动、耐太空高温差强辐射，体积小，质量轻等优点。设计的系统可在450 nm～800 nm的谱段内清晰成像，焦距181 mm，入瞳口径45 mm，视场角10.4°，边缘相对照度0.81，轴上点MTF：0.57@55 lp/mm，0.33@110 lp/mm，畸变1.2%，镜头质量622 g，外形尺寸Φ58.3 mm×117 mm，抗辐照性能≥5 krad。通过温度适应性的模拟和优化，用户进行−30 ℃～+70 ℃光学镜头热真空试验，可正常工作。该系统已成功应用于天宫二号伴飞卫星相机中，获得的图像清晰稳定，为空间遥感实验观测发挥了重要的作用。
Abstract
In order to overcome the complexity of the space environment and meet the space operating requirements of the space engineering, a micro space-borne camera optical system of 25-megapixel wide-spectrum confocal imaging was developed. This system adapted to the harsh environment of satellite launch and orbit operation, which had the advantages of impact shock resistance, high temperature and differential radiation resistance in space, small size and light weight. The designed system can be clearly imaged in the spectrum of 450 nm−800 nm, of which the focal length is 181 mm, the entrance pupil diameter is 45 mm, the field angle is 10.4º, the edge relative illumination is 0.81. The modulation transfer function (MTF) is 0.57 at 55 lp/mm and 0.33 at 110 lp/mm, the distortion is 1.2%, the quality of lens is 622 g, the overall dimension is Φ58.3 mm×117 mm and the anti-radiation performance is more than 5 krad. Through the simulation and optimization of the temperature adaptability, the user can perform the thermal vacuum test of −30℃~+70℃ optical lens normally. This system is successfully applied to the accompanying satellite camera of Tiangong-2 space lab, the obtained images are clear and stable, which plays an important role in the space remote sensing experiment observation.
关键词
星载相机 /
共焦成像 /
多光谱 /
高分辨率 /
光学设计
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Key words
optical design /
space-borne camera /
confocal imaging /
multispectral /
high resolution
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基金
中央引导地方科技发展专项（2017L3009）；福建省科技厅项目（2018G32）
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