光学学报, 2020, 40 (17): 1722002, 网络出版: 2020-08-26   

基于自由曲面的大相对孔径大视场光学探测系统 下载: 885次

Freeform-Surface-Based Optical Detection System with Large Relative Aperture and Large Field of View
马子轩 1,2,**李旭阳 1,2,*任志广 1,3褚楠清 1,2
作者单位
1 中国科学院西安光学精密机械研究所空间光学技术研究室, 陕西 西安 710119
2 中国科学院大学光电学院, 北京 100049
3 陕西师范大学物理学与信息技术学院, 陕西 西安 710119
摘要
为了实现空间碎片探测对探测光学系统灵敏度、探测时效性、孔径和总长等的需求,设计了一种大相对孔径大视场空间光学探测系统,并依据探测器指标与目标特性,确定了系统的设计参数,实现了12.5等星的探测。系统采用非对称双高斯透镜组光学结构,工作波段为450~850 nm,视场角为20°,F数为1.05,入瞳口径为150 mm。采用XY多项式自由曲面设计了系统中的一个透镜前表面,分析结果表明,该系统弥散斑均处于2×2个探测像元内,全视场在2×2个像元内的包围能量占比在86%以上,最大畸变小于1.4%。该探测系统结构紧凑,孔径合理,探测效果好,探测灵敏度高,时效性强;所使用的材料性能满足空间使用条件,且与光学加工能力匹配。所设计的探测系统可用于空间碎片的精确探测。
Abstract
In order to realize the requirements of the sensitivity, detection timeliness, aperture and total length of an optical detection system in the space debris detection scenario, we design a space optical detection system with a large relative aperture and large field of view. Moreover, based on the detector index and target characteristics, we determine the design parameters and realize the detection of 12.5 magnitude stars. The system uses an asymmetrical double Gaussian lens group optical structure and has the working band of 450-850 nm, field of view of 20°, F number of 1.05, and entrance pupil diameter of 150 mm. We design the front surface of a lens in the system based on an XY polynomial freeform surface. The design and analysis results show that the diffuse spot of the system is within the 2×2 detection pixels, the surrounding full field-of-view energy ratio within the 2×2 detection pixels is larger than 86%, and the maximum distortion is less than 1.4% . The optical detection system possesses a compact structure, a reasonable aperture, good detection effect, high detection sensitivity, and strong timeliness. The performance of the adopted materials meets the conditions of space use and matches up with the optical processing capability. The designed detection system can be used for the accurate detection of space debris.

马子轩, 李旭阳, 任志广, 褚楠清. 基于自由曲面的大相对孔径大视场光学探测系统[J]. 光学学报, 2020, 40(17): 1722002. Zixuan Ma, Xuyang Li, Zhiguang Ren, Nanqing Chu. Freeform-Surface-Based Optical Detection System with Large Relative Aperture and Large Field of View[J]. Acta Optica Sinica, 2020, 40(17): 1722002.

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