基于双级联法布里-珀罗干涉仪多纵模测温激光雷达技术  

Multi-longitudinal mode temperature lidar technology based on two-stage Fabry-Perot interferometer

作　　者：沈法华[1,2] 李薛康 朱江月 谢晨波 王邦新 杨亮亮[1,2] 周慧[1,2] 徐华 Shen Fahua;Li Xuekang;Zhu Jiangyue;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 224007,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5期165-174,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);江苏省产学研合作项目(BY2021481);江苏省智能光电器件与测控工程研究中心开放课题(2022-06);江苏省大学生创新创业训练计划省级重点项目(202110324002Z)。

摘　　要：提出了基于双级联法布里-珀罗干涉仪(FPI)的多纵模高光谱分辨率测温激光雷达技术。分析了该技术的温度探测原理,并据此构建温度探测的理论模型,导出了温度和后向散射比测量误差公式。该技术要求多纵模激光发射源的纵模间隔与双级联FPI的自由谱间距相匹配,并将各纵模的中心频率锁定在前级FPI周期性频谱的峰值位置。详细分析了频率匹配误差和锁定误差引起的温度测量偏差,结果表明:后向散射比越大,相同的频率匹配误差和锁定误差引起的温度测量偏差就越大;频率匹配误差对温度测量的影响大,为保证低层大气温度测量准确,频率匹配误差和锁定误差应分别小于5 MHz和10 MHz。进一步给出了采用FPI腔长粗扫和细扫相结合的频率匹配校准方法和步骤。设定合理的系统参数,对基于双级联FPI的多纵模测温激光雷达系统的探测性能进行仿真分析。结果表明:在0~20 km高度范围内,通常匹配误差和锁定误差引起的温度测量偏差很小,在2 km以上可忽略不计;若出现云层、沙尘等,对应高度的温度测量偏差将会较大;垂直距离分辨率取30 m@0~12 km和60 m@12~20 km、时间分辨率取1 min时,白天和晚间由噪声引起的温度测量误差分别小于3.7 K和3.5 K,后向散射比相对测量误差分别小于0.40%和0.38%。Objective The high spectral resolution lidar(HSRL)based on Rayleigh scattering spectroscopy is currently one of the most effective equipment for remote sensing of atmospheric temperature below 20 km.Traditional HSRL for temperature measurement requires a single longitudinal mode laser source,which leads to the defects of high system cost,poor environmental adaptability and low laser energy utilization.Therefore,it is of great scientific significance and practical application value to study atmospheric temperature detection technology with high detection accuracy,high spatial and temporal resolution,strong environmental adaptability and low cost.For this purpose,the HSRL with multi-longitudinal mode(MLM)laser,i.e.MLM-HSRL technology based on two-stage Fabry-Perot interferometer(FPI)for temperature measurement is proposed and studied.Methods The temperature detection principle of MLM-HSRL based on two-stage FPI is analyzed(Fig.1).The theoretical model of temperature detection is constructed accordingly,and the measurement error formulas of temperature and backscatter ratio are derived.The frequency matching and locking conditions are studied,and the temperature measurement deviation caused by frequency matching error and locking error is analyzed.The frequency matching calibration method and steps based on the combination of FPI cavity length coarse scanning and fine scanning are presented(Fig.5-6).The MLM-HSRL system parameters(Tab.1)are designed,and its detection performance is simulated using the 1976 USA atmospheric model and simulated cumulus and cirrus clouds.Results and Discussions The frequency matching condition is that the longitudinal mode interval of the MLM laser is an integer multiple of the free spectral spacing of the two-stage FPI.When this condition is satisfied,the MLM temperature measurement is equivalent to the superposition of each single longitudinal mode(SLM)temperature measurement.The analysis results show that the larger the backscatter ratio is,the greater the temperature measurement devi

关 键 词：激光雷达 大气温度 多纵模脉冲激光 法布里-珀罗干涉仪 瑞利散射 

分 类 号：TN958.98[电子电信—信号与信息处理]