Abstract：Excessive emission of carbon dioxide is the main cause of greenhouse effect, which has a profound impact on the global environment and ecosystem. The carbon dioxide emitted by fuel combustion is the main source of urban area. In order to achieve the emission reduction through carbon emission trading, it is necessary to accurately measure the carbon dioxide in the enterprise chimney. The carbon dioxide content emitted by the enterprise chimney is generally below 20%, so it is necessary to establish a high-accuracy field measurement method. This article uses multiple reflection absorption spectroscopy to accurately obtain (30012) ← (00001) R18e transition line information of carbon dioxide at 6361.25 cm-1, and further combines the ideal gas equation to accurately obtain the concentration of 15%, 10%, 5% and 1% carbon dioxide / nitrogen (nitrogen as buffer gas) mixtures. The results show that the results of this paper can characterize the concentration of the gas to be measured with high signal-to-noise ratio. The measurement results are equivalent to the weighing method based on balance, and the relative expanded uncertainty is less than 0.84% (k = 2).
2020, Vol. 41 
