基于开放路径式可调谐二极管激光吸收光谱法室内CO_(2)在线监测研究  

Indoor CO_(2)Online Monitoring Based on Open-Path Tunable Diode Laser Absorption Spectroscopy

作　　者：黄琪 王晴 汪开涛 王聪珊 崔茹悦 武红鹏[1,2] 董磊 Huang Qi;Wang Qing;Wang Kaitao;Wang Congshan;Cui Ruyue;Wu Hongpeng;Dong Lei(State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Laser Spectroscopy,Shanxi University,Taiyuan 030006,Shanxi,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,Shanxi,China;College of Physics and Electronic Engineering,Shanxi University,Taiyuan 030006,Shanxi,China)

机构地区：[1]山西大学激光光谱研究所,量子光学与光量子器件国家重点实验室,山西太原030006 [2]山西大学极端光学协同创新中心,山西太原030006 [3]山西大学物理电子工程学院,山西太原030006

出　　处：《激光与光电子学进展》2024年第5期540-548,共9页Laser & Optoelectronics Progress

基　　金：国家重点研发计划(2019YFE0118200);国家自然科学基金(62235010,62175137,62122045,62075119);山西省杰出青年基金(20210302121003)。

摘　　要：为了研究室内二氧化碳(CO_(2))体积分数变化以及其与人类活动之间的关系,设计了一种开放路径式可调谐二极管激光吸收光谱(TDLAS)传感系统对室内CO_(2)体积分数进行监测。采用中心波长为2004 nm的分布式反馈(DFB)激光器作为激励光源测量CO_(2)的R(16)特征吸收线。使用Levenberg-Marquardt非线性最小二乘法拟合测量光谱,实现体积分数测量免定标。与商用XENSIV^(TM)PAS二氧化碳传感器进行对比测量,二者的相关度R^(2)达到0.89。结果显示,室内CO_(2)每日体积分数均值为4.63×10^(-4),略高于室外的CO_(2)体积分数,并且一天内波动范围在3.86×10^(-4)~5.66×10^(-4)之间。室内CO_(2)体积分数受通风情况和室内人员活动的影响,其每日体积分数变化趋势与人员工作时间高度相关。在人员密度为0.005人/m^(3)的情况下,测量得到CO_(2)体积分数的增长速率为2.3×10^(-5)h^(-1)。因此,人员拥挤的室内环境应及时通风,以防止体积分数过高的CO_(2)引起不适。To investigate the variation in indoor carbon dioxide(CO_(2))volume fractions and their relationship with human activities,this study designs an open-path tunable diode laser absorption spectroscopy(TDLAS)sensing system to monitor indoor CO_(2)volume fractions.A distributed feedback(DFB)laser with a central wavelength of 2004 nm is employed as the excitation light source to measure the R(16)characteristic absorption line of carbon dioxide.The Levenberg-Marquardt method of nonlinear least squares fitting is employed to fit the measured spectra,allowing for volume fraction measurements without requiring calibration.Comparative measurements with a commercial XENSIV^(TM)PAS CO_(2)sensor yield a high correlation(R^(2)=0.89).The results indicate that the daily average indoor CO_(2)volume fraction is 4.63×10^(-4),slightly surpassing outdoor levels,whereas the fluctuation range of indoor CO_(2)volume fraction within a day is 3.86×10^(-4)‒5.66×10^(-4).Indoor CO_(2)volume fraction is volume fractions influenced by ventilation and indoor human activities,and the daily volume fraction trends are highly correlated with working hours.At a personnel density of 0.005 persons/m^(3),the growth rate of CO_(2)volume fraction is measured at 2.3×10^(-5)h^(-1).Therefore,timely ventilation is recommended for crowded indoor environments to prevent elevated CO_(2)volume fractions that may cause discomfort.

关 键 词：可调谐二极管激光吸收光谱技术 痕量气体 免标定 室内二氧化碳检测 在线监测 

分 类 号：O433[机械工程—光学工程] TP239[理学—光学]