Calculation and Study of Methane Absorption Coefficient at Variable Pressure and Temperature Under 3 016.49 cm<sup>-1</sup> Wave Number

Han HUANG; Hong-yan CHEN; Xiao-lu LI; Jia-hao LIU; Yong-jia ZHAO; Liang CHEN

doi:10.3964/j.issn.1000-0593(2021)08-2462-07

Spectroscopy and Spectral Analysis, Volume. 41, Issue 8, 2462(2021)

Calculation and Study of Methane Absorption Coefficient at Variable Pressure and Temperature Under 3 016.49 cm^-1 Wave Number

Han HUANG^1、*, Hong-yan CHEN^{2、2; *;}, Xiao-lu LI^1、1;, Jia-hao LIU^1、1;, Yong-jia ZHAO^2、2;, and Liang CHEN^3、3;

Author Affiliations

¹1. College of Mechanical and Electrical Engineering, China Jiliang University, Hangzhou 310018, China

²2. College of Modern Science and Technology, China Jiliang University, Hangzhou 310018, China

³3. College of Optics and Electronics Technology, China Jiliang University, Hangzhou 310018, China

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Figures & Tables(15)

Fig. 1. Flow chart of methane absorption coefficient calculation

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Fig. 2. Absorption coefficient of H₂O between 3 016.2 and 3 016.8 cm^-1

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Fig. 3. Absorption coefficient of CH₄ from 3 016.2 to 3 016.8 cm^-1 at different temperatures

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Fig. 4. Absorption coefficient of CH₄ at corresponding peak at different temperatures

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Fig. 5. Absorption coefficient of CH₄ from 3 016.2 to 3 016.8 cm^-1 at different air pressures at 273.15 K

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Fig. 6. Absorption coefficient of CH₄ at corresponding peak at different air pressures

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Fig. 7. Absorption coefficient of CH₄ at corresponding peak at different air pressures and temperatures

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Fig. 8. Gas tank aerator

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Fig. 9. Short optical path gas pool temperature measurement

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Fig. 10. Ratios of absorption coefficient to absorbance at different temperature, pressure and concentration

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Table 1. Spectral data of methane in HITRAN
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Table 1. Spectral data of methane in HITRAN
M I ν S A γ_air γ_self E″ n_air
6 1 3 016.014 6.515×10^-27 0.023 98 0.045 0.057 2 398.978 0.58
6 1 3 016.026 1.495×10^-24 0.8 0.039 0.062 1 756.149 8 0.75
6 1 3 016.028 2.004×10^-28 0.000 104 7 0.045 0.058 1 977.214 7 0.6

Table 2. Absorption coefficient of CH₄ at 3 016.49 cm^-1 at different temperatures and pressures
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Table 2. Absorption coefficient of CH₄ at 3 016.49 cm^-1 at different temperatures and pressures
气压
/atm 温度/K
263.15 273.15 283.15 293.15 303.15 313.15 323.15
0.6 34.7 34.1 33.1 32.7 31.8 30.8 29.9
0.8 40.6 39.5 38.3 37.2 36.1 34.9 33.9
1.0 45.2 43.9 42.6 41.3 40.0 38.8 37.6
1.2 49.3 47.9 46.5 45.1 43.7 42.3 41.0

Table 3. Absorbance in 1.0 atmosphere at different concentrations and temperatures

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Table 3. Absorbance in 1.0 atmosphere at different concentrations and temperatures

浓度/%	温度/℃
浓度/%	10	15	20	25	26	27	28	29	30
1.01	0.303 9	0.299 7	0.294 1	0.287 3	0.286 9	0.285 4	0.284 7	0.283 5	0.282 4
2.00	0.538 2	0.527 3	0.516 3	0.507 6	0.505 1	0.503 7	0.502 3	0.500 3	0.498 1
3.56	0.748 9	0.735 6	0.718 2	0.709 4	0.706 4	0.704 1	0.701 1	0.697 3	0.696 0
5.06	0.843 7	0.831 6	0.821 7	0.797 9	0.797 3	0.795 6	0.793 7	0.792 9	0.791 9

Table 4. Absorbance in 0.8 atmosphere at different concentrations and temperatures

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Table 4. Absorbance in 0.8 atmosphere at different concentrations and temperatures

浓度/%	温度/℃
浓度/%	10	15	20	25	26	27	28	29	30
1.01	0.272 7	0.268 4	0.264 6	0.260 1	0.259 5	0.258 6	0.257 9	0.257 2	0.256 8
2.00	0.480 3	0.474 3	0.466 4	0.459 3	0.457 0	0.456 0	0.465 2	0.453 1	0.451 9
3.56	0.672 9	0.660 5	0.651 9	0.640 9	0.639 7	0.637 7	0.635 7	0.632 6	0.630 8
5.06	0.766 0	0.752 7	0.744 2	0.729 6	0.727 4	0.725 1	0.722 3	0.720 3	0.718 2

Table 5. Absorption coefficient at different temperatures and pressures
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Table 5. Absorption coefficient at different temperatures and pressures
气压/atm 温度/℃
10 15 20 25 26 27 28 29 30
1.0 42.417 0 41.665 2 40.913 4 40.161 6 40.011 3 39.860 9 39.710 6 39.560 2 39.409 8
0.8 38.057 0 37.484 0 36.911 0 36.338 0 36.223 4 36.108 8 35.994 2 35.879 6 35.765 0

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Han HUANG, Hong-yan CHEN, Xiao-lu LI, Jia-hao LIU, Yong-jia ZHAO, Liang CHEN. Calculation and Study of Methane Absorption Coefficient at Variable Pressure and Temperature Under 3 016.49 cm^-1 Wave Number[J]. Spectroscopy and Spectral Analysis, 2021, 41(8): 2462

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Paper Information

Category: Research Articles

Received: Jul. 18, 2020

Accepted: --

Published Online: Sep. 8, 2021

The Author Email: HUANG Han (Huang_Han_95@163.com)

DOI:10.3964/j.issn.1000-0593(2021)08-2462-07

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Spectral data of methane in HITRAN

Table 1. Spectral data of methane in HITRAN

Table 2. Absorption coefficient of CH4 at 3 016.49 cm-1 at different temperatures and pressures

Table 2. Absorption coefficient of CH4 at 3 016.49 cm-1 at different temperatures and pressures

Table 3. Absorbance in 1.0 atmosphere at different concentrations and temperatures

Table 3. Absorbance in 1.0 atmosphere at different concentrations and temperatures

Table 4. Absorbance in 0.8 atmosphere at different concentrations and temperatures

Table 4. Absorbance in 0.8 atmosphere at different concentrations and temperatures

Table 5. Absorption coefficient at different temperatures and pressures

Table 5. Absorption coefficient at different temperatures and pressures

Table 2. Absorption coefficient of CH₄ at 3 016.49 cm^-1 at different temperatures and pressures

Table 2. Absorption coefficient of CH₄ at 3 016.49 cm^-1 at different temperatures and pressures