激光外差光谱仪模拟风场探测  

Simulation of wind field detection by laser heterodyne spectrometer

作　　者：李竣 薛正跃 刘笑海 王晶晶 王贵师 刘锟 高晓明 谈图 Li Jun;Xue Zheng-Yue;Liu Xiao-Hai;Wang Jing-Jing;Wang Gui-Shi;Liu Kun;Gao Xiao-Ming;Tan Tu(School of Environmental Science and Optoelectronic Technology,University of Science and Technology of China,Hefei 230031,China;Basic Science Research Center,Anhui Institute of Optics and Fine Mechanics,Hefei Institute of Material Science,Chinese Academy of Sciences,Hefei 230031,China)

机构地区：[1]中国科学技术大学环境科学与光电技术学院,合肥230031 [2]中国科学院合肥物质科学研究院安徽光学精密机械研究所,基础科学研究中心,合肥230031

出　　处：《物理学报》2022年第7期147-153,共7页Acta Physica Sinica

基　　金：国家自然科学基金重点项目(批准号:41730103)、国家自然科学基金青年科学基金(批准号:41805018)资助的课题;国家重点研发计划(批准号:2017YFC0209705)。

摘　　要：中高层大气风场是表征中高层大气环境的重要参量,对中高层大气风场的探测在民用和军用领域有着重要意义.激光外差光谱技术是近年来迅速发展的一种高光谱分辨率和灵敏度的被动式遥感探测技术,以激光外差光谱技术为核心研制的激光外差光谱仪因具有体积小、重量轻、结构稳定等特点,在星载测量中高层风场领域有巨大的潜力和应用前景.激光外差光谱仪的地面风场探测性能验证是其应用到卫星上的关键环节,本文利用实验室环境下建立的风场模拟装置实现0—25 m/s的风速变化,并基于光谱分辨率为0.003 cm^(-1)激光外差光谱仪分别测量了无风速变化和不同风速下的CH_(4)吸收谱,测量风速的分辨率为3 m/s.使用光纤F-P干涉仪、波长计和参考池对激光器输出光频率进行实时的相对定标和绝对定标.通过计算吸收光谱中心频率的偏移量,反演得到风场风速,并与风场模拟器风速对比,相对误差为1.49 m/s.该实验对激光外差光谱仪测风性能进行有效验证,证明了使用激光外差光谱仪进行中高层大气风场测量的可能性.The middle-and upper-atmosphere wind field are important parameters that characterize the middle-and upper-atmosphere environment,respectively.The detection of the middle-and the upper-atmosphere wind field are of great significance in the civil field and military field.Laser heterodyne spectroscopy technology is a passive remote sensing detection technology with high spectral resolution and sensitivity,and has developed rapidly in recent years.The laser heterodyne spectrometer that takes laser heterodyne spectroscopy technology as its core,is developed due to its small size,light weight and stable structure.The verification of the groundbased wind field detection performance of the laser heterodyne spectrometer is a key part of its application to satellites.In this paper,a wind speed simulation device is built in a laboratory environment to achieve a wind speed change from 0 m/s to 25 m/s in a wind field.A laser heterodyne spectrometer with a spectral resolution of 0.003 cm^(-1)is used to measure the CH_(4)absorption spectrum without and with a wind field for different wind speeds,the resolution of measuring wind speed is 3 m/s.For relative and absolute calibration of the distributed feedback laser(DL)frequency,an interference fiber with a free dispersion range D;=0.01167 cm;,a wavemeter and a reference cell is used.The experimental results effectively verify the wind measurement performance of the laser heterodyne spectrometer and prove the possibility of using the laser heterodyne spectrometer to measure the atmospheric wind field.

关 键 词：激光外差 高分辨光谱 模拟实验 风速测量 

分 类 号：P412[天文地球—大气科学及气象学]