基于光谱吸收的CO_(2)气体检测系统  

Study on CO2 detecting system based on spectrum absorption

作　　者：宫卫华 张婷婷 魏玉宾 王兆伟 李艳芳 张秦端 刘统玉 张伟[1] GONG Wei-Hua;ZHANG Ting-Ting;WEI Yu-Bin;WANG Zhao-Wei;LI Yan-Fang;ZHANG Qin-Duan;LIU Tong-Yu;ZHANG Wei(Laser Institute,Qilu University of Technology(Shandong Academy of Sciences),Jinan 250103,China;Shandong Micro-Sensor Photonics Ltd.,Jinan 250103,China)

机构地区：[1]齐鲁工业大学(山东省科学院)山东省科学院激光研究所,山东济南250103 [2]山东省微感光电子有限公司,山东济南250103

出　　处：《山东科学》2022年第6期103-108,共6页Shandong Science

基　　金：国家重点研发计划(2021YFB3201904,2021YFB3201905);山东省重大科技创新工程项目(2019JZZY020501);山东省自然科学基金(ZR2019PF016,ZR2020QF098);济南市创新团队项目(2020GXRC032)。

摘　　要：针对CO_(2)气体实时在线监测的应用需求,以比尔-朗伯定律为理论基础,基于可调谐半导体激光吸收光谱技术搭建一套CO_(2)气体在线检测系统。选择吸收谱线波长为1 609.583 nm,并在系统中搭建两路参考光路用于消除光源信号波动和实现自动寻峰,以提高检测系统的稳定性与准确性。通过对系统的标定与校准,系统测量相对误差小于0.8%,系统重复性小于0.06%,响应时间不超过18 s,对空气中CO的体积分数进行连续4 h监测,其值的波动范围为360×10^(-6)-400×10^(-6)。试验结果表明该系统具有较好的稳定性与可靠性,可满足CO_(2)气体实时在线监测的应用需求。To meet the application requirements of real-time carbon dioxide(CO_(2))-gas online monitoring, this paper proposes an online detection system for the CO_(2)gas based on tunable diode laser absorption spectroscopy according to the theory of Beer-Lambert law. The selected absorption spectrum wavelength of the system is 1 609.583 nm. Futher, two reference optical paths are built to eliminate the signal fluctuation of the light source and automatically detect the absorption peak to improve the stability and accuracy of the detection system. The calibration of the system shows that the relative measurement error of the system is less than 0.8%, the system repeatability is less than 0.06%, and the response time is less than or equal to 18 s. Continuous monitoring of CO_(2)in the air for 4 h shows that the fluctuation range of the volume fraction measurement is 360×10^(-6) to 400×10^(-6). The system has good stability and reliability and can meet the application requirements of real-time CO_(2)gas online monitoring.

关 键 词：二氧化碳 可调谐半导体激光吸收光谱技术 气体检测 参考光路 

分 类 号：P41[天文地球—大气科学及气象学]