中国激光, 2018, 45 (5): 0510005, 网络出版: 2018-05-02
星载激光雷达系统杂散光分析与抑制 下载: 964次
Stray Light Analysis and Suppression for Spaceborne Lidar System
光学设计 杂散光抑制 双向散射分布函数 星载激光雷达 optical design stray light suppression bidirectional scattering distribution function spaceborne lidar
摘要
针对全球范围CO2浓度和气溶胶检测的星载激光雷达系统的可行性进行研究。由于大气后向散射信号很弱, 故星载激光雷达对杂散光很敏感。激光雷达系统由Ritchey-Chretien接收望远镜、多波段中继光学系统以及光电探测系统构成, 因此, 相比于传统成像光学系统, 其杂散光的分析与抑制技术得到改进。对光机结构建模, 基于杂散光来源分类和大量光线追迹, 提出了一种位于激光雷达后光学系统中, 而非接收望远镜中的杂散光抑制方法。仿真结果表明, 位于后光学系统中准直器镜筒上的挡光环极大地抑制了杂散光。因此, 可以舍去接收望远镜上的挡光环。
Abstract
The feasibility of a spaceborne lidar system for global CO2 concentration and aerosol detection is studied. As the atmospheric backscatter signal is weak, the spaceborne lidar is very sensitive to stray light. The lidar system is composed of Ritchey-Chretien receiving telescopes, multi-band relay optical systems, and photodetection systems. Therefore, compared with conventional imaging optical systems, the analysis and suppression of stray light of the lidar system can be improved. Based on the modeling of opto-mechanical structures and the classification of stray light sources and a large number of ray traces, a stray light suppression method is proposed in the laser lidar rear-optical system rather than in the receiving telescope. The simulation results show that the baffles in the collimator lens barrels in rear-optical system largely suppresses the stray light. Therefore, the baffles in the receiving telescope should be removed.
穆永吉, 李蕊, 万渊, 刘继桥, 侯霞, 陈卫标. 星载激光雷达系统杂散光分析与抑制[J]. 中国激光, 2018, 45(5): 0510005. Mu Yongji, Li Rui, Wan Yuan, Liu Jiqiao, Hou Xia, Chen Weibiao. Stray Light Analysis and Suppression for Spaceborne Lidar System[J]. Chinese Journal of Lasers, 2018, 45(5): 0510005.