用于物证搜寻的大视场变焦偏振成像光学系统设计

针对传统无人机载相机在复杂环境下物证搜寻成像对比度低、证物识别难度大等问题, 提出利用偏振成像技术, 进行物证搜寻识别。为保证搜寻效率、识别概率和低照条件下成像效果, 设计了大视场大相对孔径两档变焦偏振成像光学系统。系统焦距分别为11 mm和22 mm, F数分别为1.8和2.7, 视场角60°和34°, 并给出了合理的调焦方式,可实现在3 m和10 m飞行高度下清晰成像。经过仿真分析, 调制传递函数在奈奎斯特频率91 lp/mm处优于0.45, 满足成像质量要求, 公差分析显示, 在满足成像质量条件下, 公差范围合理。将系统与微偏振片阵列探测器集成, 搭载无人机平台, 可在复杂环境中对案发现场进行实时高效物证搜寻, 大幅提升案事件破获能力。

Abstract

Aiming at the difficulty of searching for physical evidence in complex environments by ordinary unmanned airborne cameras, a method using polarization imaging technology was proposed to conduct physical evidence detection and search. In order to ensure search efficiency and work under low illumination conditions, a large field-of-view and large relative aperture two-speed zoom polarization imaging optical system was designed. The system had a focal length of 11 mm and 22 mm, the F-number of 1.8 and 2.7, an angle of view of 60° and 34°, and a reasonable focusing method was given, which can achieve clear imaging at 3 m and 10 m flying height. After simulation analysis, the design results show that the modulation transfers function(MTF) of short focus and long focus is better than 0.45 at 91 lp/mm, and the imaging quality is better. Tolerance analysis shows that tolerances are well designed to meet imaging quality. The system is integrated with the micro-polarizer array detector and equipped with a drone platform, which can perform real-time and efficient physical evidence search on the crime scene in a complex environment, and greatly enhance the ability of cases to crack.

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尹骁, 李英超, 史浩东, 江伦, 王超, 刘壮, 李冠霖. 用于物证搜寻的大视场变焦偏振成像光学系统设计[J]. 红外与激光工程, 2019, 48(4): 0418006. Yin Xiao, Li Yingchao, Shi Haodong, Jiang Lun, Wang Chao, Liu Zhuang, Li Guanlin. Wide-angle zoom polarization imaging optical system design for physical evidence search[J]. Infrared and Laser Engineering, 2019, 48(4): 0418006.

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