同轴零盲区米散射激光雷达系统仿真与设计  

Simulation and Design of Coaxial Zero-Blind-Zone Meter Scattering Lidar System

作　　者：李东旭 孙高飞[1] 衣文索[1] 蒋雨辰 赵瑞安 Li Dongxu;Sun Gaofei;Yi Wensuo;Jiang Yuchen;Zhao Rui′an(School of Optoelectronic Engineering,Changchun University of Science and Technology,Changchun130022,Jilin,China)

机构地区：[1]长春理工大学光电工程学院,吉林长春130022

出　　处：《应用激光》2024年第3期142-149,共8页Applied Laser

基　　金：国家自然科学基金项目资助(61805022)。

摘　　要：针对传统米散射激光雷达近距离探测盲区大的缺陷,设计一款同轴的米散射激光雷达气溶胶探测系统。首先,通过美国标准大气模型和激光雷达系统参数对系统回波信噪比进行了数值模拟研究。主要讨论激光脉冲能量、雷达接收口径、脉冲累加数对回波信噪比的影响。仿真结果表明,提高发射激光脉冲能量、增加雷达接收口径、增加脉冲累加数都可以提高回波信噪比,其中,增加雷达接收口径对回波信噪比的提升最为明显。其次,设计平衡探测器对散射回光进行光电转换。最后,基于系统结构搭建了可移动式米散射激光雷达实验平台,对大气气溶胶进行初步探测,试验结果表明:提高发射激光脉冲能量对探测距离的影响不大,该系统的有效探测距离在约10 km;平衡探测法相对于直接探测法信噪比提高了2.7倍;系统的同轴设计使得近距离探测盲区几乎为0,空间分辨率可以达到120 m。To address limitations of traditional meter scattering lidar in detecting large blind areas at close range,we present a coaxial meter scattering lidar aerosol detection system.Firstly,numerical simulation of the signal-to-noise ratio of the system echo signal is carried out based on the standard atmospheric model and lidar system parameters.This study mainly discussed the influence of laser pulse energy,radar receiving aperture and pulse accumulation number on the echo signal-to-noise ratio,of which the increase in the radar receiving uc2aperture is the most obvious improvement.Secondly,a balanced detector is designed to convert the scattered return light into a photoelectric;Finally,based on the system structure,a movable meter scattering lidar experimental platform was built.The atmospheric aerosol was preliminarily detected,and the experimental results showed that the increase in the emitted laser pulse energy had little influence on the explorative distance.This system can reach a 10km-explore-distance effectively.The balanced detection method is 2.7times which is higher the direct detection method.The coaxial design of the system makes the close detection blind zone almost zero,and the spatial resolution can reach 120m.

关 键 词：米散射 大气气溶胶 数值模拟 盲区 

分 类 号：TH741[机械工程—光学工程] O433.51[机械工程—仪器科学与技术]