基于长光程气室的多组分气体监测系统  

Multi-Component Gas Monitoring System Based on an Long-Path Gas Cell

作　　者：闫泽宇 孙祚 费宁 刘涛[1] 万涛[1] 刘邦学 YAN Zeyu;SUN Zuo;FEI Ning;LIU Tao;WAN Tao;LIU Bangxue(Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆大学,重庆400044

出　　处：《计量科学与技术》2023年第9期49-55,共7页Metrology Science and Technology

基　　金：重庆市技术创新与应用发展专项(cstc2020jscx-dxwtBX0052)。

摘　　要：为更好的满足工况环境下多组分危险气体的低浓度范围监测需求,减小测量仪器的体积,提高气体浓度的测量精度,研制了基于怀特池结构的长光程气体吸收池,用于降低仪器的检测限,从而能够探测出低浓度的多组分危险气体。介绍了基于怀特池结构的长光程气体吸收池的设计、工作原理和仿真结果,介绍了光学实验平台的搭建以及红外光源、红外热释电探测器的选型,并在此基础上开展了实验。采用最小二乘法拟合出各个气体的浓度反演模型,使用不同组合的标准气体对模型进行了验证,并计算了实验结果的相对误差。数据结果表明,设计的多组分危险气体在线监测仪器检测限可达5μL/L,测量误差≤±5%F.S.(满量程),能够满足低浓度多组分危险气体的测量需求。To address the monitoring needs of low-concentration multi-component hazardous gases in industrial environments and reduce the size of measurement instruments,a long-path gas absorption cell using the White cell structure was developed.This cell aims to lower the detection limit,enabling the detection of low-concentration multi-component hazardous gases.This paper discusses the design,working principles,and simulation results of the long-path gas absorption cell,as well as the setup of the optical experimental platform,selection of the infrared light source,and infrared pyroelectric detectors.Experiments based on this setup were conducted,and the least squares method was employed to derive concentration inversion models for various gases.These models were validated using different combinations of standard gases,and the relative errors of the experimental results were calculated.The results indicate that the designed multicomponent hazardous gas online monitoring instrument can detect concentrations as low as 5μL/L with a measurement error of≤±5%F.S.(full scale),meeting the needs for low-concentration multi-component hazardous gas measurements.

关 键 词：计量学 非分散红外 气体监测 长光程气室 怀特池 热释电探测器 

分 类 号：TB99[一般工业技术—计量学]