基于光子筛的全天时激光雷达探测技术仿真  

Simulation of All-Day Lidar Detection Technology Based on Photon Sieve

作　　者：任雅丽 王玉峰[1] 郭庆 孙泽平 杜嘉敏 狄慧鸽[1] 宋跃辉[1] 华灯鑫[1] Ren Yali;Wang Yufeng;Guo Qing;Sun Zeping;Du Jiamin;Di Huige;Song Yuehui;Hua Dengxin(School of Mechanical and Precision Instrument Engineering,Xi’an University of Technology,Xi’an 710048,Shaanxi,China)

机构地区：[1]西安理工大学机械与精密仪器工程学院,陕西西安710048

出　　处：《光学学报》2024年第18期389-398,共10页Acta Optica Sinica

基　　金：国家自然科学基金(42375135);陕西省创新人才推进计划(2020-TD014)。

摘　　要：白天强太阳背景光的去噪技术是激光雷达全天时、高精度探测的关键技术,也是目前全天时激光雷达探测的重难点问题。本文以太阳背景光的滤除为目标,利用光子筛的衍射特性和涡旋光的光场特性,提出了基于光子筛的太阳背景光滤除技术,实现了激光雷达的全天时探测。首先,基于光子筛衍射理论,数值仿真了三种典型的入射光束经过光子筛的衍射光场分布,得到了涡旋光束、平行光束和高斯光束在光子筛衍射焦平面上的光场分布差异性,获得了光斑形状不同的聚焦光斑。然后,设计了基于光子筛的太阳背景光滤波技术,利用光子筛和带有中心小孔的平面反射镜,实现太阳背景光和大气回波信号在空间上的绝对分离,得到纯净的大气后向散射回波信号。最后,以大气水汽拉曼探测为例,在晴天和有云天气条件下,对光子筛激光雷达的全天时探测性能进行了仿真分析,理论验证了光子筛激光雷达全天时探测技术的可行性。Objective Currently,there is a pressing for high temporal and spatial resolution atmospheric observation data in meteorological forecasting,meteorological services,climate change,atmospheric environment,and others.However,during daytime lidar detection,the solar background light is the most important interference noise,and the strong sky background light and ground radiance will pollute or even flood the lidar returns,and thus directly affects and greatly restricts the effective detection distance and detection accuracy.Mitigating the influence of strong solar background light remains the foremost challenge in achieving all-day lidar detection.Methods Drawing upon the diffraction theory of photon sieves and leveraging the optical field properties of vortex lasers,we propose a photon sieve-based all-day lidar detection technique aimed at filtering out solar background light.Initially,using vector diffraction theory,we conduct numerical simulations to analyze the diffraction patterns of photon sieves under various incident beams including Gaussian,parallel,and vortex beams.Subsequently,based on the numerical simulation,we develop a photon sieve-based solar background light filtering technique for filtering solar background light and design an optical system dedicated to this purpose.This system facilitates absolute spatial separation between the atmospheric lidar returns and the solar background light in two independent channels.In addition,the signal-to-noise ratio curves of lidar are simulated under clear and cloudy weather conditions,to demonstrate the all-day performance of a photon sieve-based lidar system.Results and Discussions The numerical simulations of the photon sieve present significant differences in the shape and position of focused spots for Gaussian,parallel,and vortex beams.While parallel and Gaussian beams exhibit similar focused spot shapes but differ in size(Fig.2),vortex beams produce focused spots characterized by a dark center and a bright ring whose radius increases with the topological cha

关 键 词：激光雷达 光子筛 太阳背景光 全天时 涡旋光 

分 类 号：TN958.98[电子电信—信号与信息处理]