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
王松 1周闯 1李素文 1牟福生1
作者信息
- 1. 淮北师范大学,污染物敏感材料与环境修复安徽省重点实验室,淮北 235000
- 折叠
摘要
CO2 是主要的温室气体之一,它的排放和累积导致温室效应加强,进而引起全球气候变化,因此获取大气环境中CO2 的浓度变化对研究气候变化意义重大.针对低成本、快速和在线精确测量大气环境CO2 的技术需求,本文构建了基于法布里-珀罗干涉仪的CO2 大气浓度在线测量系统,并研究了精确获取其浓度反演方法.采用基于微机电系统(MEMS)技术的热辐射源作为法布里-珀罗干涉仪系统光源,设计透射式光路代替常见的折射式光路.通过静电控制两镜片的间距,改变干涉谱,实现 10 nm步长的中心波长的干涉峰调节,扫描获得CO2 实时在线吸收光谱,基于差分吸收光谱原理获取了CO2 气体的浓度.利用样气标定系统,并用商用光声光谱多气体分析仪校验系统,结果表明,该系统检测限达 1.09×10-6,检测精度为±1.13×10-6,测量误差小于 1%.在煤城淮北开展了大气环境CO2 实时在线检测,并与商用光声光谱分析仪开展比对观测实验,二者相关系数R = 0.92.实验结果表明,研发的法布里-珀罗干涉仪系统能够满足大气环境CO2 浓度的快速、在线高精度测量技术需求.
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
基金项目
国家自然科学基金(41875040)
国家自然科学基金(41705012)
安徽省高等学校创新团队项目(2023AH010043)
安徽省自然科学基金(2208085QF215)
安徽省高等学校自然科学研究项目(2023AH050338)
出版年
2024
国家科技期刊平台
NSTL
万方数据