Absorption measurement of methane gas with broadband light source using fiber-optic sensor system

doi:10.1007/s12200-010-0115-8

Front Optoelec Chin

2010, Vol. 3

Issue (4) : 394-398 https://doi.org/10.1007/s12200-010-0115-8

RESEARCH ARTICLE

Absorption measurement of methane gas with broadband light source using fiber-optic sensor system

Feng CAO, Duan LIU(

), Jiang LIN, Bichun HU, Deming LIU

College of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

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Abstract

The absorption coefficient of methane is very important for measuring the concentration of methane. We theoretically analyzed the general expression of methane absorption coefficient for a given condition, at room temperature of 296 K, and we simulated the relationship between the absorption and the wavelength of the light source. The experimental results we obtained are consistent with the simulation. The discrepancy between the experimental results and the simulation results is also discussed.

Keywords fiber-optic sensor gas measurement methane absorption coefficient

Corresponding Author(s): LIU Duan,Email:liuduan@gmail.com

Issue Date: 05 December 2010

Cite this article:

Feng CAO,Duan LIU,Jiang LIN, et al. Absorption measurement of methane gas with broadband light source using fiber-optic sensor system[J]. Front Optoelec Chin, 2010, 3(4): 394-398.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-010-0115-8
https://academic.hep.com.cn/foe/EN/Y2010/V3/I4/394

Fig.1 Simulation result of relationship between methane gas’s absorption coefficient and wavelength of light source from 1630 to 1680 nm (under the standard atmospheric pressure =1 atm at room temperature of 296 K)

Fig.2 Simulated methane’s absorption coefficient at 1645 nm

Fig.3 Simulated methane’s absorption coefficient from 1665 to 1668 nm

Fig.4 Schematic diagram of fiber-optic gas sensor system

Fig.5 Schematic diagram of collimators within gas cell where gas under test interacts with light from SLD

Fig.6 Measured output spectrum (from 1640 to 1670 nm) of light source after 5% methane gas pumped into gas cell

Fig.7 Measured output spectrum from 1665 to 1668 nm when 5% methane was pumped into gas cell

Fig.8 Measured output spectrum from 1644 to 1646 nm when 5% methane was pumped into gas cell

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