基于TDLAS-WMS技术的高灵敏度红外甲烷检测仪

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英文篇名：Design of High Sensitivity Infrared Methane Detector Based on TDLAS-WMS 作者：李珉 ; 柏逢明 英文作者：LI Min;BAI Feng-ming;College of Electronics and Information Engineering in Changchun University of Science and technology;College of Humanities and Information in Changchun University of Technology; 关键词：探测器 ; TDLAS ; WMS ; DFB激光器 ; 甲烷 英文关键词：Detector;;TDLAS;;WMS;;DFB laser;;Methane 中文刊名：JGZZ 英文刊名：Laser Journal 机构：长春理工大学电子信息工程学院;长春工业大学人文信息学院; 出版日期：2015-10-25 出版单位：激光杂志 年：2015 期：v.36;No.217 基金：湖南省教育厅科学研究项目(13C259) 语种：中文; 页：JGZZ201510018 页数：5 CN：10 ISSN：50-1085/TN 分类号：78-82

摘要

甲烷气体是一种对人和环境有重要危害的气体,针对环境中甲烷气体浓度的测量问题,利用甲烷气体的1653.72nm波长二次谐波作为检测手段,提出了一种基于TDLAS-WMS技术的高灵敏度红外甲烷检测方法。采用DFB激光器作为系统的可调谐激光器,通过光电探测器和前置放大器对激光信号进行接收和处理,利用锁相放大器提取甲烷气体的二次谐波信息。开发了系统控制软件和数据处理软件,对系统运行过程进行控制并对二次谐波数据进行反演得到甲烷气体的浓度信息。该方法具有反应时间快、灵敏度高的特点,通过更换不同的激光器可以满足对不同气体的检测要求。实验结果表明:系统在甲烷浓度小于5%时有较好的灵敏度,得到的检测浓度数据与甲烷气体真实浓度相符,检测结果相对误差控制在2.5%以内,能够满足实际检测的需要。
        Methane gas is a harmful gas for people and environment,in order to solve the problem of measuring the concentration of methane gas in environment,this paper proposes a high sensitivity infrared methane detector based on TDLAS-WMS by using of the second harmonic of methane gas in 1653. 72 nm wavelength. The DFB laser is used as the tunable laser of system,the laser signal is received and processed by photoelectric detector and preamplifier,the second harmonic information of methane gas is achieved by lock-in amplifier. The system which controls software and data processing software is designed to control the running process of system and achieve the concentration of methane gas by using second harmonic data. The method has the characteristics of fast response time and high sensitivity,and can meet the requirement of different gas detection by changing different laser. The experimental results show that the system has good sensitivity when the methane concentration is less than 5%,and the detection concentration of the system is consistent with the real concentration of methane gas,the relative error of detection results is within 2. 5%,which can meet the needs of the actual detection.

引文

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