固态面阵激光雷达接收光学系统设计

在确保固态面阵激光雷达安全性的前提下,为了提高光学系统的像面能量均匀度以及增加光学系统所接收到的能量,保证在探测过程中的低信噪比以及对目标的可探测性,本文通过对发射激光能量和接收能量进行建模,给出了光学参数,研究了影响接收光学系统像面照度的因素。指出大视场大相对孔径高照度均匀性光学系统的设计要素,并通过ZEMAX优化分析给出了具体的实施过程。最终设计了λ=905(±5)nm,焦距为15 mm,相对孔径为1/1.4,视场角为2ω=76°的激光雷达接收镜头,系统总长小于77 mm,在空间频率为20 lp/mm处MTF值大于0.5,在0.85视场内的相对畸变小于8%,像面照度不均匀性小于7.2%。满足激光雷达的探测要求。

Design of solid-state array laser radar receiving optical system

With regards to the safety of solid-state area array lidars,in order to improve the energy uniform-ity of imaging plane and increase the energy received by the optical system,this paper works to ensure a low signal-to-noise ratio and the detectability of a target.The optical parameters are given by modeling the emitted and received laser energy.The factors affecting the image plane's illumination in the optical receiver are studied and the design elements of optical systems with large fields of view,large relative aperture,and high illumination uniformity are described.Through ZEMAX optimization analysis,a detailed implementation process is then provided.A lidar receiving lens withλ=905(±5)nm,a focal length of 15 mm,a relative aperture of 1/1.4,and a field of view 2ω=76°was designed.The total system length was less than 77 mm,and the MTF value at the spatial frequency of 20 lp/mm was greater than 0.5.The relative distortion at the 0.85 field of view was less than 8%and the unevenness of the image plane illumination was less than 7.2%.This design meets the requirements for lidar detection.