物理学报2024，Vol.73Issue(2)：84-90,7.DOI:10.7498/aps.73.20231224
基于法布里-珀罗干涉仪测量大气环境CO2 的方法
Method of measuring atmospheric CO2 based on Fabry-Perot interferometer
摘要
Abstract
CO2 is one of the main greenhouse gases.Its emission and accumulation lead to the strengthening of the greenhouse effect,which in turn causes global climate change.Therefore,it is of great significance to obtain the change of CO2 concentration in the atmospheric environment for the study of climate change.In order to meet the requirements of low cost,fast,on-line and accurate measurement of CO2 in atmospheric environment,a CO2 gas concentration measurement system based on Fabry-Perot interferometer is built in this work.The thermal radiation source based on micro-electro-mechanical system(MEMS)technology is used as a light source of the Fabry-Perot interferometer system,and the transmission optical path is designed to replace the common refractive optical path.By electrostatically controlling the distance between the two lenses and changing the interference spectrum,the interference peak adjustment of the center wavelength of the 10 nm step is realized,and the absorption spectrum is obtained by scanning.Based on the principle of differential optical absorption spectroscopy,the concentration of CO2 gas is obtained,and the real-time on-line monitoring of CO2 concentration is realized.Using the sample gas calibration system and the commercial photoacoustic spectroscopy multi-gas analyzer to verify the system,the results show that the detection limit of the system is 1.09×10-6,the detection accuracy is±1.13×10-6,and the measurement error is less than 1%.Real-time online monitoring of atmospheric CO2 has been conducted in Huaibei,a coal city.A comparative observational experiment is performed between this system and a commercial photoacoustic spectroscopy multi-gas analyzer.The two systems show consistent trends in measuring CO2 variations,with a correlation coefficient of R=0.92.It shows that the Fabry-Perot interferometer system can meet the requirement of rapid,convenient and high precision measurement of CO2 concentration in the environment.关键词
二氧化碳/法布里-珀罗干涉仪/热辐射源/光声光谱多气体分析仪Key words
carbon dioxide/Fabry-Perot interferometer/thermal radiation source/photoacoustic spectrum multi-gas analyzer引用本文复制引用
王松,周闯,李素文,牟福生..基于法布里-珀罗干涉仪测量大气环境CO2 的方法[J].物理学报,2024,73(2):84-90,7.基金项目
国家自然科学基金(批准号:41875040,41705012)、安徽省高等学校创新团队项目(批准号:2023AH010043)、安徽省自然科学研究基金(批准号:2208085QF215)和安徽省高校自然科学研究项目(批准号:2023AH050338)资助的课题. Project supported by the National Natural Science Foundation of China(Grant No.41875040,41705012),the Innovation Team Project of Anhui Educational Committee,China(Grant No.2023AH010043),the Natural Science Foundation of Anhui Province,China(Grant No.2208085QF215),and the Natural Science Research Project of Anhui Educational Committee,China(Grant No.2023AH050338). （批准号:41875040,41705012）
