湖泊监测多通道光子计数激光雷达接收光学系统设计  

Design of Optical System for Multi-Channel Photon Counting Laser Radar for Lake Monitoring

作　　者：郭祺 向雨琰 周智标 李松[1] GUO Qi;XIANG Yu-yan;ZHANG Zhi-biao;LI Song(Electronic Information School,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学电子信息学院,湖北武汉430072

出　　处：《光学与光电技术》2024年第3期8-15,共8页Optics & Optoelectronic Technology

摘　　要：高原内陆的湖区占我国湖泊总面积的57.2%,是环境、气候资源的重要研究对象。由于大量高原湖泊地处无人区,且覆盖面积广,目前对高原湖泊的实际观测资料非常有限。为解决无人地区高原湖泊的监测难题,研究了高精度的无人机平台光子计数激光雷达,建立了单光子探测器探测概率模型,推导了激光雷达信号水平、接收通道数与漂移误差之间的理论关系。为进一步减小光子计数激光雷达的漂移误差,设计了一种基于四通道探测的工作波段为532±0.1 nm,系统口径为50 mm,视场角为0.2 mrad,传播距离为2~3 km的光子计数激光雷达接收光学系统。通过优化设计,系统像差指标符合设计要求,分光镜组的能量效率为83.87%,结构设置合理,可为多通道光子计数激光雷达光学系统用于湖泊监测提供参考。The inland plateau lakes account for 57.2%of the total lake area in China,which is an important research object for environmental and climate resources.As a large number of plateau lakes are located in uninhabited areas and cover a large area,the actual observation data of plateau lakes are very limited at present.In order to solve the monitoring problem of plateau lakes in uninhabited areas,a high-precision photon counting lidar on unmanned aerial vehicle platform was studied,a detection probability model of single photon detector was established,and the theoretical relationship between the signal level of lidar,the number of receiving channels and drift error was derived.In order to further reduce the drift error of photon counting lidar,a photon counting lidar receiving optical system based on four-channel detection with a working wavelength of 532±0.1 nm,a system aperture of 50 mm,an angle of field of 0.2 mrad,and a propagation distance of 2~3 km was designed.Through optimization design,the system aberration index met the design requirements,and the energy efficiency of the spectroscope group was 83.87%.The structure was reasonable,which can provide a reference for the application of multi-channel photon counting lidar optical system in lake monitoring.

关 键 词：光子计数激光雷达 漂移误差 多通道探测 探测概率分布 光学设计 

分 类 号：TN219[电子电信—物理电子学]