基于连续激光器的侧向拉曼散射激光雷达无盲区探测大气水汽技术研究  

Accurate Measurements of Atmospheric Water Vapor Using Lateral Scanning Vibrational Raman Scattering Lidar with Continuous-Wave Laser

作　　者：杨帆[1] 高飞[1,2] 李晓莉 高雄 张城安 汪丽 闫庆[1,2] 石冬晨 辛文辉[1,2] 华灯鑫 Yang Fan;Gao Fei;Li Xiaoli;Gao Xiong;Zhang Cheng'an;Wang Li;Yan Qing;Shi Dongchen;Xin Wenhui;Hua Dengxin(School of Mechanical and Precision Instrument Engineering,Xi'an University of Technology,Xi'an 710048,Shaanxi,China;Shaanxi Collaborative Innovation Center for Modern Equipment Green Manufacturing,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》2024年第12期320-328,共9页Acta Optica Sinica

基　　金：国家自然科学基金(42175149,42275151,42275148);陕西省自然科学基金(2023-JC-QN-0308);陕西省教育厅科研计划项目(23JY055);西安理工大学博士创新基金(310-252072205)。

摘　　要：大气中50%以上的水汽主要存在于海拔2 km以内的低层大气内,而传统振动拉曼散射激光雷达探测大气水汽主要采用基于后向散射的同轴和非同轴平行收发系统结构,系统探测盲区和过渡区限制了其在近地表大气水汽探测方面的有效性。因此,提出一种新型的基于双基地收发系统结构的侧向振动拉曼散射激光雷达探测技术,通过俯仰转动云台带动侧向望远镜接收系统,对不同高度层下氮气和水汽分子的侧向振动拉曼散射回波光谱进行扫描探测,从而实现地表到感兴趣高度范围内无盲区的近地表大气水汽精细探测。在实验观测研究中,采用整段等距分辨率和分段等距分辨率两种探测模式,探测结果展示了两种转动方案均可实现从近地表到特定高度的大气水汽探测,特别是分段等距分辨率云台转动方案凭借可变分辨率的探测优势,在近地表区域实现了对大气水汽分布的精细探测。Objective More than 50%of atmospheric water vapor exists mainly in the lower atmosphere within 2 km.Vibrational Raman scattering lidar is an important remote sensing tool for atmospheric water vapor measurement.However,the traditional vibrational Raman scattering lidar mainly adopts a coaxial and non-coaxial parallel transceiver system structure,and the system detection blind zone and transition zone limit their effectiveness in ground atmospheric water vapor detection.We propose a novel detection technique of lateral vibrational Raman scattering lidars based on the structure of a bistatic system,where the lateral vibrational Raman scattering signals of N_(2) and H_(2)O at different heights are detected by the elevation angle scanning of the lateral receiver system.Finally,it realizes fine detection of near-surface atmospheric water vapor without a blind zone from the ground to the height of interest.Methods We study the lateral vibrational Raman scattering lidar technique in the application of accurate measurements of atmospheric water vapor from the ground to the height of interest.First,a novel lateral scanning vibrational Raman scattering lidar technique is proposed and designed.Two telescopes combined with specified narrow-band interference filters are utilized to detect the lateral scattering signals of the vibrational Raman scattering spectra of N_(2) and H_(2)O respectively.Then,the inversion algorithm of atmospheric water vapor using the lateral vibrational Raman scattering lidar is established.Vibrational Raman scattering spectra of N_(2) and H_(2)O have large wavelength differences,which lead to large differences between atmospheric transmissivity of the slant path in these two detection channels,and the aerosol extinction coefficients inverted by Raman method are adopted to correct atmospheric transmissivity of the slant path and improve the detection accuracy of the atmospheric water vapor mixing ratio.Finally,the construction of the experimental system is completed,and the preliminary experiments ar

关 键 词：激光雷达 近地表大气水汽 侧向振动拉曼散射 无盲区探测 俯仰扫描 

分 类 号：TN958.98[电子电信—信号与信息处理]