Wide‑Range Gas Concentration Detection Method Based on Nonlinear Characteristics in Wavelength Modulation Spectroscopy

Qianjin Wang; Pengshuai Sun; Zhirong Zhang; Yongjun Cai; Wenbiao Huang; Tao Pang; Hua Xia; Bian Wu

doi:10.3788/CJL230857

Chinese Journal of Lasers, Volume. 51, Issue 5, 0511001(2024)

Wide‑Range Gas Concentration Detection Method Based on Nonlinear Characteristics in Wavelength Modulation Spectroscopy

Qianjin Wang^1,2, Pengshuai Sun^2、*, Zhirong Zhang^1,2,3,4, Yongjun Cai⁵, Wenbiao Huang^1,2, Tao Pang², Hua Xia², and Bian Wu²

Author Affiliations

¹School of Environment Science and Optoelectronic Technology, University of Science and Technology of China, Hefei 230026, Anhui, China

²Anhui Provincial Key Laboratory of Photonic Devices and Materials, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, Anhui, China

³Key Lab of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, Anhui, China

⁴Advanced Laser Technology Laboratory of Anhui Province, Hefei 230037, Anhui, China

⁵PipeChina General Academy of Science & Technology, Langfang 065000, Hebei, China

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Figures & Tables(9)

Fig. 1. Absorption spectra

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Fig. 2. Schematic of experimental system

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Fig. 3. Selection of calibration points and cubic fitting curve

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Fig. 4. Linearity and error of inversion result under low absorbance. (a) Inverted concentration and linear fitting; (b) relative error and absolute error

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Fig. 5. Linearity and error of inversion result under high absorbance. (a) Inverted concentration and linear fitting; (b) relative error and absolute error

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$Original 2f signal of CH4 with volume fraction of 100×10-6$

Fig. 6. Original 2f signal of CH₄ with volume fraction of 100×10^-6

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Fig. 7. Long-time measurement result and its histogram distribution. (a) Inverted concentrations; (b) frequency statistics histogram distribution and Gaussian fitting

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Table 1. Absorption line parameters of CH₄ around 6047 cm^-¹
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Table 1. Absorption line parameters of CH₄ around 6047 cm^-¹
Line υ₀ /cm^-1 S₀ /（cm·molecule^-1） L_env /（cm^-1·atm^-1） L_self /（cm^-1·atm^-1）
#1 6046.9425 7.877×10^-22 0.0651 0.079
#2 6046.9516 9.277×10^-22 0.0774 0.079
#3 6046.9636 1.455×10^-21 0.0578 0.079

Table 2. Comparison of performance of CH₄sensors in different references

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Table 2. Comparison of performance of CH₄sensors in different references

Reference	Method	Absorption length	Detectable range	Detectable order of magnitude	Maximum relative error
CH₄ sensor in Ref.［9］	WMS+DAS	10 cm	224×10^-6-1	4	5%
CH₄ sensor in Ref.［12］	WMS	20 cm	11×10^-6-1	5	7%
This work	WMS-NL	3 m	1.5×10^-6-1×10^-2	4	4%

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Qianjin Wang, Pengshuai Sun, Zhirong Zhang, Yongjun Cai, Wenbiao Huang, Tao Pang, Hua Xia, Bian Wu. Wide‑Range Gas Concentration Detection Method Based on Nonlinear Characteristics in Wavelength Modulation Spectroscopy[J]. Chinese Journal of Lasers, 2024, 51(5): 0511001

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