非扫描测风激光雷达光学系统设计

Optical system design of monostatic nonscanning Doppler wind lidar

光学系统是测风激光雷达小型化的关键,光学设计的质量直接影响系统的整机性能。提出了一种全光纤多路收发非扫描多普勒测风激光雷达系统方案,对其工作原理作了简要介绍;在对激光雷达系统信噪比开展理论分析的基础上,提出了光学天线的视场、孔径、焦距等设计参数,并利用光学设计软件对光学天线进行了设计和仿真实验。该系统工作波长为1064nm,设计结果表明,光学天线相对口径为1∶4.28,全视场角为20°×22.5°,总长为277mm,后截距127.28 mm,有效焦距300 mm,口径70 mm,各视场光纤耦合效率均在65%以上,满足设计指标要求。

The optical system is a key factor for a wind lidar system miniaturization,and the quality of the optical design directly affects the whole performance of the lidar system.A system configuration for all-fiber non-scanning Doppler wind lidar is presented,and its working principle is briefly introduced.The optical system simulation and design are given.The system working at 1 064 nm wavelength.Design results show that the relative diameter is 1∶4.28,the whole field of view angle is20°× 22.5°,the total length is 277 mm,the back work distance is 127.28 mm,the effective focal length is 300 mm,the diameter of optical system is 70 mm,and each field of optical fiber coupling efficiency is over 65%.the parameters meet the design requirements.