斜程能见度探测的米-拉曼散射扫描型激光雷达研制  

Development of Mie-Raman Scattering Scanning Lidar for Probing Slant Visibility

作　　者：李仕春[1,2] 任腾 王旭 王玉峰 辛文辉[1,2] 华灯鑫 Li Shichun;Ren Teng;Wang Xu;Wang Yufeng;Xin Wenhui;Hua Dengxin(School of Mechanical and Precision Instrument Engineering,Xi’an University of Technology,Xi'an 710048,Shaanxi,China;Collaborative Innovation Centre for Modern-Equipment Environmentally-Conscious Manufacturing of shaanxi province,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 [2]陕西省现代装备绿色制造协同创新中心,陕西西安710048

出　　处：《光学学报》2022年第12期248-259,共12页Acta Optica Sinica

基　　金：国家自然科学基金(U1733202,62175199,61875162);陕西省自然科学基金(2020JM-445);陕西省教育厅自然科学基金(20JY048)。

摘　　要：针对飞机起降安全的斜程能见度探测问题,研制了一台4通道的米-拉曼散射扫描型激光雷达,可实现双波长无假定的大气消光系数廓线反演,进而可精细探测大气斜程能见度。基于大气能见度理论,假设观测路径附近无光源且忽略气溶胶粒子谱分布影响,分析了采用大气平均消光系数反演斜程能见度的有效性。该激光雷达采用Nd:YAG激光器的基频(1064 nm)和三倍频(355 nm)激光脉冲作为光源,采用以二向色镜和窄带干涉滤光片为核心的拉曼光谱分光系统,利用有限状态机理论和多线程并发技术实现多模块协同控制软件。结合侧向散射型能见度仪,开展初步观测实验与分析。结果表明,当天气为多云转阴,地面水平能见度为9 km,俯仰角为26°时,所研制系统累积观测4 min的有效探测距离优于11 km,近地面分析结果取得了很好的一致性。Aiming at the problem of slant visibility detection for safe take-off and landing of aircraft,a 4-channel Mie-Raman scattering scanning lidar is developed to achieve the dual-wavelength assumption-free retrieval of the atmospheric extinction coefficient profile,and then to finely obtain atmospheric slant visibility.Based on the atmospheric visibility theory,assuming that there is no light source near the observation path and ignoring the influence of aerosol particle spectrum distribution,the effectiveness of using atmospheric mean extinction coefficient to retrieve slant visibility is analyzed.This lidar utilizes the fundamental frequency(1064 nm)and triple frequency(355 nm)laser pulses of the Nd:YAG laser as the light source,adopts the Raman polychromator with dichroic mirrors and narrow-band interference filters,and uses the finite state machine theory and multi-thread concurrency technique to realize the multi-module collaborative control software.Combined with the side-scattering visibility meter,the preliminary observation experiments and comparative analysis are carried out.The results show that when the weather is cloudy to overcast,the ground horizontal visibility is 9 km and the pitch angle is 26°,the effective detection distance of this system within 4 min cumulative time is better than 11 km,and the near-ground analysis results are in good agreement.

关 键 词：传感器 激光雷达 斜程能见度 大气消光系数 拉曼光谱分光 有限状态机 

分 类 号：TN958.98[电子电信—信号与信息处理] P427.24[电子电信—信息与通信工程]