Near-Infrared Laser Sensor for Detection of Methane Isotope Abundance

Tianyu Zhang; Zhiwei Liu; Lei Zhang; Hongbin Lu; Chuantao Zheng; Yiding Wang

doi:10.3788/AOS202141.1030001

Acta Optica Sinica, Volume. 41, Issue 10, 1030001(2021)

Near-Infrared Laser Sensor for Detection of Methane Isotope Abundance

Tianyu Zhang^1,2, Zhiwei Liu^1,2, Lei Zhang^1,2, Hongbin Lu^1,2, Chuantao Zheng^1,2、*, and Yiding Wang^1,2

¹State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, Jilin 130012, China

²Jilin Provincial Engineering Research Center of Infrared Gas Sensing Technique, Changchun, Jilin 130012, China

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Figures & Tables(3)

Fig. 1. Absorption line of ¹²CH₄ and ¹³CH₄ within the range of 6028.2--6029.5 cm^-1(296 K)

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Table 1. Detailed indicators of the selected absorption line pair^[13]

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Table 1. Detailed indicators of the selected absorption line pair^[13]

Molecule	Wavenumber /cm^-1	Intensity /(cm·molecule^-1)	E_Low /cm^-1	ΔE /cm^-1	ΔT_MAX /K
¹²CH₄	6028.5537	2.5720×10^-23	104.7728	41.8929	1.5046
	6029.0727	9.1990×10^-24	62.8787
¹³CH₄	6029.0890	8.9780×10^-24	62.8798	41.8929	1.5046
	6029.1079	1.5180×10^-23	62.8811

Table 2. Simulation results of the influence of pressure on spectral absorbance

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Table 2. Simulation results of the influence of pressure on spectral absorbance

Molecule	Absorbance	Pressure /kPa		Δδ¹³CH₄ /%
¹²CH₄	0.02843	13.30724	0.71298	0.08449
¹³CH₄	0.02027	13.30724	0.71298
¹²CH₄	0.02849	13.35724	0.71358
¹³CH₄	0.02033	13.35724	0.71358
¹²CH₄	0.02781	13.33224	0.71018(std)
¹³CH₄	0.01975	13.33224	0.71018(std)

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Tianyu Zhang, Zhiwei Liu, Lei Zhang, Hongbin Lu, Chuantao Zheng, Yiding Wang. Near-Infrared Laser Sensor for Detection of Methane Isotope Abundance[J]. Acta Optica Sinica, 2021, 41(10): 1030001

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