甲醇气体浓度检测系统设计  

Design of methanol gas concentration detection system

作　　者：李浩然 付芸[1] 范宇华 万楚琦 LI Hao-ran;FU Yun;FAN Yu-hua;WAN Chu-qi(College of Optoelectronic Engineering,Changchun University of Science and Technology,Changchun 130022,China;Institute of Space Optics Technology,Changchun University of Science and Technology,Changchun 130022,China)

机构地区：[1]长春理工大学光电工程学院,吉林长春130022 [2]长春理工大学空间光电技术研究所,吉林长春130022

出　　处：《激光与红外》2024年第9期1417-1424,共8页Laser & Infrared

基　　金：吉林省重点科技计划项目(No.20180201049YY)资助。

摘　　要：针对现有的甲醇气体检测方法已无法满足迅速发展的燃料电池市场对快速检测的需求问题,以甲醇气体为研究对象展开了检测系统的设计和定量分析。首先,根据甲醇气体红外吸收特性选取光源并设计其驱动电路,气体将对光源进行调制。其次,利用正交锁相放大技术和小波分解法,设计了一种采用小波分解对锁相放大输出信号进行处理的锁相放大系统,其利用小波分解技术对锁相放大输出信号进行二次处理,检出限为9 ppm,实现检测微弱信号的目的,且响应时间约为2 s。最后,基于线性拟合建立分析模型,信号决定系数为0.979。实验表明,本文设计的甲醇检测系统具有模型的预测准确性和灵敏度较高等特点,能够实现甲醇的快速定量检测。In response to the problem that existing methanol gas detection methods cannot meet the rapidly growing demand for rapid detection in the fuel cell market,a detection system design and quantitative analysis were conducted focusing on methanol gas.Firstly,the light source was selected based on the infrared absorption characteristics of methanol gas,and its driving circuit was designed.The gas modulates the light source.Secondly,an orthogonal lock-in amplification system was designed using wavelet decomposition and lock-in amplification techniques.The lock-in amplification output signal was further processed using wavelet decomposition,achieving a detection limit of 9 ppm and a response time of approximately 2 s,enabling the detection of weak signals.Lastly,an analysis model was established based on linear regression with a signal determination coefficient of 0.979.Experimental results demonstrate that the designed methanol detection system has accurate predictive capabilities and high sensitivity,enabling rapid and quantitative detection of methanol.

关 键 词：红外吸收光谱 甲醇 锁相放大 定量分析 小波分解 

分 类 号：O433.1[机械工程—光学工程] TN249[理学—光学]