折反式大口径星敏感器光学设计及杂散光分析  

Optical Design and Stray Light Analysis for Large Aperture Catadioptricstar Sensor

作　　者：薛庆生[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033

出　　处：《光学学报》2016年第2期171-177,共7页Acta Optica Sinica

基　　金：国家自然科学基金(41105014;41575023);中科院长春光机所领域前沿创新项目

摘　　要：大口径星敏感器已成为卫星导航领域的迫切需求，根据大口径和轻量化的研究目标，采用R-C系统和球面补偿透镜组相结合的结构型式，设计了一个视场1．8°、焦距719mm，人瞳直径164mm，工作波段0．45～0．9μm的折反式大口径星敏感器光学系统，采用像方远心设计，降低了像面离焦对能量质心位置计算的影响，同时提高了像面照度均匀性。根据像差理论计算初始结构参数，利用光学设计软件CODEV进行了光线追迹和优化设计，设计结果表明，光学系统遮拦比0．317，光学传递函数在特征频率26lp／mm处，大于0．81，成像点80％的能量集中在3×3像元内，垂轴色差小于2μm，最大质心偏差小于2μm。采用内遮光罩、外遮光罩、次镜遮光罩和挡光环等消杂光设计来降低杂散光水平，利用Tracepro软件对光机系统的杂散光进行了仿真分析，分析结果表明，在离轴角6°～90°范围内，点源透射比在10-7～10-4量级，满足应用要求。Satellite navigation urgently requires large aperture star sensor. Based on the research objective of large aperture and light weight, alarge aperture catadioptric optical system is designed using an R-C system and a spherical compensating lens.The field of view of the star sensor is 18°, the focal length is 719 Mm,the diameter of the entrance pupil is 164 mm, and the working waveband is from 0.45 μm to 0.9 μm. The telecentric image plane design decreases the effect of calculating the position of centroid caused by the imaging plane defoeussing and increases the irradiance uniformity. The initial parameters are calculated based on aberration theory. Then, ray tracing and optimization are performed by CODE V software.The abscured ratio is 0.317.The MTF is more than 0.81@ 26 lp/mm, which approaches the diffraction limit, 80% energy encircled is within 3×3 pixels,the lateral chromatic aberration is less than 2μm, and the centroidal deviation is less than 2 μm.The internal baffle, external baffle, second-mirror baffle, and blocking rings are used to decrease the stray light level. The stray light of the optical- mechanical is simulated and analyzed using TracePro software,and the results show that the point source transmittance is between 10-7 to 10-4 in the range of the incident angle 6°～90° incident angle, which satisfies the requirements of application.

关 键 词：光学设计 星敏感器 杂散光分析 折反式 遮光罩 

分 类 号：O436[机械工程—光学工程]