High-sensitivity methane monitoring based on quasi-fundamental mode matched continuous-wave cavity ring-down spectroscopy

作     者：Zhe Li Shuang Yang Zhirong Zhang Hua Xia Tao Pang Bian Wu Pengshuai Sun Huadong Wang Runqing Yu 李哲;杨爽;张志荣;夏滑;庞涛;吴边;孙鹏帅;王华东;余润磬

作者机构：Anhui Provincial Key Laboratory of Photonic Devices and MaterialsAnhui Institute of Optics and Fine MechanicsHFIPSChinese Academy of SciencesHefei 230031China University of Science and Technology of ChinaHefei 230026China Key Laboratory of Environmental Optics and TechnologyAnhui Institute of Optics and Fine MechanicsHFIPSChinese Academy of SciencesHefei 230031China Advanced Laser Technology Laboratory of Anhui ProvinceHefei 230037China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2022年第31卷第9期

页      面：326-332页

核心收录：

学科分类：0810[工学-信息与通信工程] 081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 080401[工学-精密仪器及机械] 070302[理学-分析化学] 0804[工学-仪器科学与技术] 080402[工学-测试计量技术及仪器] 0835[工学-软件工程] 0703[理学-化学] 081002[工学-信号与信息处理] 

基　　金：This research is financial supported by the Natural National Science Foundation of China(Grant Nos.11874364,41877311,and 42005107) the National Key Research and Development Program of China(Grant No.2017YFC0805004) the CAS&Bengbu Technology Transfer Project(Grant No.ZKBB202102) 

主　　题：continuous-wave cavity ring-down spectroscopy(CW-CRDS) cavity modes coupling efficiency mode matching greenhouse gas 

摘      要：Continuous-wave cavity ring-down spectroscopy(CW-CRDS)is an important technical means to monitor greenhouse gases in atmospheric *** this paper,a CW-CRDS system is built to meet the needs of atmospheric methane *** problem of mode matching is explained from the perspective of transverse mode and longitudinal mode,and the influence of laser injection efficiency on measurement precision is further *** results of cavity ring-down time measurement show that the measurement precision is higher when the laser is coupled with the fundamental *** the experiment,DFB laser is used to calibrate the system with standard methane concentration,and the measurement residual is less than±4×10^(-4)μs^(-1).The methane concentration in the air is monitored in real time for two *** results show the consistency of the concentration changes over the two days,which further demonstrates the reliability of the system for the measurement of trace *** analyzing the influence of mode matching,it not only assists the adjustment of the optical path,but also further improves the sensitivity of the system measurement.