Carbon Dioxide Concentration Measurement of Fixed SourceBased on Herriott Absorption Cell
MA Lu-yao1,MA Ruo-meng1,ZHU Xiao-yi2,LUO Yong-jia3,REN Ge1,2,LIN Hong1,2
1. Zhengzhou Institute of Metrology, Henan, Zhengzhou 450001, China
2. National Institute of Metrology, Beijing 100029, China
3. State High-tech Industry Investment Group, Zhengzhou,Henan 450001, China
Abstract：Accurate carbon emission measurement is an important step to achieve the goal of "carbon peak and carbon neutral". Among all sources of emissions, the emission of carbon dioxide from point sources is a major factor in the greenhouse effect. Therefore, it is important to accurately measure the concentration of carbon dioxide from point sources. Based on the principle of near-infrared molecular absorption spectroscopy combined with multiple reflection direct absorption spectroscopy, an accurate method was established for the measurement of CO2 concentration using 35% CO2/N2mixture.CO2 transitions from (30012)←(00001)R16e of 6359.97cm-1 to (30012)←(00001)R18e of 6361.25cm-1, the spectral line intensity of R18e was calculated.By comparing the absorption areas of 35% CO2/N2mixtures with other CO2/N2 mixtures, concentrations of 15%, 10%, and 5% CO2/N2 mixtures can be obtained. The results show that the theoretical method and experimental results can well characterize the concentration of the gas to be measured, and the uncertainty of measurement is comparable to that of the weighing method based on balance.
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2022, Vol. 43 
