面向天然气泄漏检测的中红外甲烷传感系统与应用  

Mid-Infrared Methane Sensor System for Natural Gas Leakage Detection and Its Application

作　　者：闫格 张磊 于玲 宋芳[1,2] 郑传涛 王一丁[1,2] Yan Ge;Zhang Lei;Yu Ling;Song Fang;Zheng Chuantao;Wang Yiding(State Key Laborutory of Iutegruted Optoelectromics,College of Electrouic Scieuce and Engineering,Jilin University,Changchuen 130012,Jilin,China;Jilin Prorincial Engineering Research Center of Infrared Gas Sensing Technigue,Changchun 130012,Jilin,China)

机构地区：[1]吉林大学电子科学与工程学院集成光电子学国家重点联合实验室,吉林长春130012 [2]吉林省红外气体传感技术工程研究中心,吉林长春130012

出　　处：《中国激光》2022年第18期112-120,共9页Chinese Journal of Lasers

基　　金：国家重点研发计划(2021YFB3201903);国家自然科学基金(61960206004,62175087);吉林省科技发展计划(20200401059GX);吉林省教育厅科技发展规划项目(JJKH20211088KJ);长春市重点研发项目(21ZGN24);吉林大学科技创新团队项目(JLUSTIRT,2021TD-39)。

摘　　要：甲烷(CH_(4))是天然气的主要成分,快速探测潜在的天然气泄漏、科学预防泄漏事故的发生是保障城市天然气管道输运安全的关键。基于中红外可调谐半导体激光吸收光谱技术,研制了一种检测大气痕量甲烷的传感器系统。采用中心波长为3291 nm的带间级联激光器作为光源,探测CH_(4)位于3038.5 cm^(-1)处的较强吸收峰。采用有效光程为26.4 m的多通池作为气室,增强了气体吸收。采用波长调制光谱技术,降低了CH_(4)检测下限。Allan方差结果表明,当积分时间为54 s时,系统的检测下限为6.2×10^(-10)。采用LabVIEW平台获取了浓度数据和天气站数据,基于气体湍流模型,并结合粒子群优化算法,给出了一种移动式天然气泄漏源定位方法。利用所研制的传感器系统,在吉林大学校园开展了大气甲烷移动监测实验和天然气泄漏源定位实验,验证了该传感器系统具有较强的移动探测能力。研究结果为天然气泄漏快速溯源提供了一种有效途径。Objective Methane(CH_(4))is the primary component of natural gas,accounting for more than 90%of it.CH_(4)is a colorless,odorless,flammable,and explosive gas.It is a safety hazard during the production and transportation of natural gas,coal,and oil.CH_(4) leakage is difficult to detect and can result in suffocation or even death.When the CH_(4) concentration(volume fraction)in the air reaches a certain limit(5%-16%),it can cause combustion and explosion in the presence of a heat source or open fire.According to the data from the U.S.Environmental Protection Agency in 2020,CH_(4) is a strong,short-term greenhouse gas with a rapid warming effect,accounting for 20%of global emissions,ranking second only to carbon dioxide(CO_(2)).Although CH_(4) exists in the atmosphere for only approximately 12 years,its heat storage capacity in the atmosphere is 28-34 times that of CO_(2).Therefore,the development of a CH_(4) sensor system for real-time monitoring of CH_(4) concentration is essential for mitigating climate change,finding the sources of natural gas leakage quickly,and minimizing the loss of life and property.Methods The selection of gas detection technology is essential for detecting trace concentrations of CH_(4) in the atmosphere.In terms of time resolution,size,and cost,optical methods based on mid-infrared laser spectroscopy are advantageous for CH_(4) sensing.Tunable diode laser absorption spectroscopy(TDLAS)is demonstrated to be an excellent tool for trace gas detection because of its high sensitivity,selectivity,and real-time performance.In this paper,a mid-infrared CH_(4) sensor system is developed based on TDLAS.The light source is an interband cascade laser that is used to target the absorption line of CH_(4) at 3038.5 cm^(-1).For gas absorption enhancement,a multi-pass gas cell with an effective optical path of 26.4 m is used.To increase detection range and sensitivity,the wavelength modulation spectroscopy(WMS)scheme is used.The optical structure is simple,stable,and compact,making it ideal for vehicle-bo

关 键 词：传感器 红外光谱学 气体检测 车载移动测量 泄漏源定位 

分 类 号：TN21[电子电信—物理电子学]