基于双法布里-珀罗干涉仪多纵模米散射多普勒激光雷达技术  

Multi-longitudinal-mode Mie scattering Doppler lidar technology based on dual Fabry-Perot interferometer

作　　者：沈法华[1,2] 徐菁苑 范安冬 谢晨波 王邦新 杨亮亮[1,2] 周慧[1,2] 徐华 Shen Fahua;Xu Jingyuan;Fan Andong;Xie Chenbo;Wang Bangxin;Yang Liangliang;Zhou Hui;Xu Hua(Jiangsu Province Intelligent Optoelectronic Devices and Measurement-Control Engineering Research Center,Department of Physics and Electronic Engineering,Yancheng Teachers University,Yancheng 224002,China;Jiangsu Province Atmospheric Detection Lidar Technology Civil-Military Integration Innovation Platform,Yancheng 224007,China;Key Laboratory of Atmospheric Optics,Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Hefei 230031,China)

机构地区：[1]盐城师范学院物理与电子工程学院江苏省智能光电器件与测控工程研究中心,江苏盐城224007 [2]江苏省大气探测激光雷达技术军民融合创新平台,江苏盐城224007 [3]中国科学院安徽光学精密机械研究所中国科学院大气光学重点实验室,安徽合肥230031

出　　处：《红外与激光工程》2023年第7期181-190,共10页Infrared and Laser Engineering

基　　金：江苏省重点研发计划-社会发展项目(BE2021685);江苏省自然科学基金面上项目(BK20201475);江苏省智能光电器件与测控工程研究中心开放课题(2022-06)。

摘　　要：提出了基于双法布里-珀罗干涉仪(FPI)的多纵模米散射多普勒激光雷达技术,分析了探测原理,并导出了径向风速和后向散射比测量误差公式。该技术要求多纵模激光源的纵模间隔与双FPI的自由谱间距相匹配,并将各纵模的中心频率锁定在双FPI周期性频谱曲线的交叉点附近。详细分析了频率匹配误差引起的风速测量误差。在低风速区域,由频率匹配误差造成的风速测量误差增加的百分数EV随匹配误差的增大而迅速增大;频率匹配误差不变时,EV随风速增大而缓慢减小;当频率匹配误差小于10 MHz时,EV将小于5%。设定合理的大气模式和系统参数,对基于双FPI的多纵模米散射多普勒激光雷达的探测性能进行了仿真分析。结果表明:在0~10 km高度、0~50 m/s的径向风速范围内,当距离分辨率为30 m、时间分辨率为30 s、激光发射天顶角为30°时,系统白天和晚间的径向风速测量精度分别优于1.50 m/s和1.02 m/s;在无云条件下,系统白天和晚间的后向散射比相对测量精度分别优于6.57%和4.53%。Objective Doppler lidar is one of the most powerful tools for the remote sensing of the three-dimensional wind field in the atmosphere at present.It is widely used in wind power generation,weather forecast,aviation safety,atmospheric science research and other fields.The traditional coherent detection or direct detection Doppler lidar requires a single-longitudinal-mode laser source with narrow linewidth,resulting in the shortcomings of the existing Doppler lidar system such as high cost,poor environmental adaptability,low laser energy utilization,which seriously restricts their industrialization and the airborne and spaceborne applications.Therefore,it is of great significance and scientific value to explore and study the technology of multi-longitudinal-mode(MLM)Doppler lidar using MLM laser as the emission source.For this purpose,the MLM Mie Doppler lidar technology based on dual Fabry-Perot interferometer(FPI)is proposed and studied.Methods The detection principle of MLM Mie Doppler lidar based on dual FPI is analyzed(Fig.1).The theoretical formulas of radial wind speed and backscatter ratio measurement errors are derived,and the matching relationship between the longitudinal mode interval of the MLM laser source and the free spectral spacing of the dual FPI is analyzed,as well as the wind speed measurement error caused by the mismatch between the two.The lidar system structure(Fig.7)and parameters(Tab.1)are designed,and the detection performance of the designed lidar system is simulated using the 1976 USA atmospheric model and simulated cumulus clouds.Results and Discussions The frequency matching condition between the longitudinal mode interval of the MLM laser source and the free spectral spacing of the dual FPI is that the former is an integral multiple of the latter.When the frequency matching condition is satisfied,the MLM wind measurement is equivalent to the superposition of each single-longitudinal-mode(SLM)wind measurement.In the low wind speed region,the percentage of the wind speed measurement err

关 键 词：激光雷达 大气风场 多纵模脉冲激光 法布里-珀罗干涉仪 米散射 

分 类 号：TN958.98[电子电信—信号与信息处理]