Precise measurements the broadening characteristics and parameters of methane near-infrared absorption spectrum at high pressure

Ying HE; Yu-Jun ZHANG; Kun YOU; Bo-Qiang FAN; Meng-Qi LI; Dong-Qi YU; Hao XIE; Bo-En LEI; Wei JIA; Jun-Sen JING; Wen-Qing LIU

doi:10.11972/j.issn.1001-9014.2020.06.012

Journal of Infrared and Millimeter Waves, Volume. 39, Issue 6, 742(2020)

Precise measurements the broadening characteristics and parameters of methane near-infrared absorption spectrum at high pressure

Ying HE¹, Yu-Jun ZHANG^1,2、*, Kun YOU¹, Bo-Qiang FAN^1,2, Meng-Qi LI^1,2, Dong-Qi YU^1,2, Hao XIE^1,2, Bo-En LEI^1,2, Wei JIA³, Jun-Sen JING³, and Wen-Qing LIU^1,2

Author Affiliations

¹Key Laboratory of Environmental Optics & Technology， Anhui Institute of Optics and Fine Mechanics， Chinese Academy of Sciences， Hefei230031， China

²University of Science and Technology of China， Hefei230026， China

³College of Mechanical and Electrical Engineering， Anhui Jianzhu University， Hefei230601， China

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Figures & Tables(9)

Fig. 1. （a） Spectrum measurement experimental platform, （b） gas path connection of experimental device

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Fig. 2. （a） Absorbance signal before and after filtering, （b） line-type fitting and residual result

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Fig. 3. Absorbance spectral signals after Lorentz line-type fitting

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Fig. 4. Nitrogen broadening coefficient at 6 046.96 cm^-1

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Fig. 5. Center frequency drift phenomenon

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Fig. 6. Calculated the pressure shift coefficient of nitrogen-induced

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Fig. 7. Absorbance signals of different concentration at high pressure

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Table 1. Specific parameters of methane absorption line at 6046.9647 cm^-1（Hitran2008 database）

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Table 1. Specific parameters of methane absorption line at 6046.9647 cm^-1（Hitran2008 database）

Specific parameters	Value
spectral line intensity S（cm mol^-1）	1.34E-21
air-broadened half width at half maximum $γ_{a i r}$ @296 K/ （cm^-1 atm^-1）	0.062 1
self-broadened half width at half maximum $γ_{s e l f}$ @296 K/ （cm^-1 atm^-1）	0.082
temperature dependence coefficient of the air-broadened n	0.85
pressure shift of the air-broadened δair@296 K/ （cm^-1 atm^-1）	0

Table 2. Methane standard gas concentration and inverted concentration
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Table 2. Methane standard gas concentration and inverted concentration
Time Ture concentration/（%） Inverted concentration/（%）
Relative error
/（%）
1 0.500 0.512 2.40
2 0.400 0.390 2.50
3 0.300 0.311 3.67
4 0.200 0.208 4.00

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Ying HE, Yu-Jun ZHANG, Kun YOU, Bo-Qiang FAN, Meng-Qi LI, Dong-Qi YU, Hao XIE, Bo-En LEI, Wei JIA, Jun-Sen JING, Wen-Qing LIU. Precise measurements the broadening characteristics and parameters of methane near-infrared absorption spectrum at high pressure[J]. Journal of Infrared and Millimeter Waves, 2020, 39(6): 742

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Paper Information

Category: Infrared Spectroscopy and Spectral Analysis

Received: Feb. 19, 2020

Accepted: --

Published Online: Jan. 20, 2021

The Author Email: Yu-Jun ZHANG (yjzhang@aiofm.ac.cn)

DOI:10.11972/j.issn.1001-9014.2020.06.012

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Specific parameters of methane absorption line at 6046.9647 cm-1（Hitran2008 database）

Table 1. Specific parameters of methane absorption line at 6046.9647 cm-1（Hitran2008 database）

Table 2. Methane standard gas concentration and inverted concentration

Table 2. Methane standard gas concentration and inverted concentration

Table 1. Specific parameters of methane absorption line at 6046.9647 cm^-1（Hitran2008 database）

Table 1. Specific parameters of methane absorption line at 6046.9647 cm^-1（Hitran2008 database）