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Abstract

The minimum amount that can be detected and quantitatively analyzed by Fourier infrared spectrometer depends on the signal-to-noise ratio of the measured gas spectrum. In order to use Fourier transform infrared absorption spectroscopy to measure CO ₂, CO, CH ₄, N ₂O and other greenhouse gases, the signal-to-noise ratio and instrument detection limit of the mixed gas are studied. We propose a method to calculate the gas detection limit of the instrument through the HITRAN simulation spectrum. In addition, we build an experimental platform to verify the accuracy of the detection limit approximation based on the HITRAN simulation spectrum calculation, which serves as the actual measurement detection limit of the instrument, and we also analyze the reasons why there appears the error between the existing experimental platform and optimization scheme and their deficiencies as well.

Keywords:

Fourier transform infrared spectroscopy/
spectral simulation/
detection limit/
greenhouse gas

Authors and contacts

Corresponding author:Xu Liang,xuliang@aiofm.ac.cn

Funds:Project supported by the National Natural Science Foundation of China (Grant No. 41941011), the Key Research Program of Frontier Sciences, Chinese Academy of Sciences (Grant No. QYZDY-SSW-DQC016), and the National Key Research and Development Program of China (Grant No. 2019YFF0303400).

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Cited By

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Component	Wave number/cm^–1	Extended network compatibility goal	Range in unpolluted troposphere	Range covered by the WMO scale
CO₂/(μmol·mol^–1)	2150—2310	0.2	380—450	250—520
N₂O/(nmol·mol^–1)	2097—2242	0.3	325—335	260—370
CO/(nmol·mol^–1)	2097—2242	5	30—300	30—500
CH₄/(nmol·mol^–1)	2810—3150	5	1750—2100	300—5900

DownLoad: CSV

	Componentsequence
	CO₂/(μmol·mol^–1)	N₂O/(nmol·mol^–1)	CO/(nmol·mol^–1)	CH₄/(μmol·mol^–1)
DL of MCT detector experimental measurement	6.95634	30.01392	32.98644	0.01947
DL of simulated spectrum detection	3.24915	15.63831	41.69358	0.02526
DL of MIP detector experimental measurement	2.43627	6.35112	16.89	0.012

DownLoad: CSV

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Vol. 71, Issue 9 - 2022-05-05

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