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Research on the Detection of Methane Using Hollow Photonic Band Gap Fiber |
WANG Zhi-fang,WANG Shu-tao,WANG Gui-chuan,CHE Xian-ge |
Electrical Engineering College, Yanshan University, Qinhuangdao, Hebei 066004, China |
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Abstract All-fiber methane detection system based on the spectrum absorption properties of methane using a hollow-core photonic bandgap fiber (HC-PBGF) as special gas cell was demonstrated. The detection wavelength of methane was chosen on the basis of HITRAN2012 and HAWKS; In order to accelerate methane gas diffusion, pressure difference between inlet of HC-PBGF and outlet of HC-PBGF was formed with air pump. The optical path can be extended twice by using mirrors. The results indicated that the time is 190 seconds of the gas diffusion, system value fluctuation is 0.012% in half-hour and average repetition rate is 99.63%. Finally, making up different concentration methane gases, the results indicated that methane concentration has a good linear relationship with relative strength of absorption and the linearity is 99.92%. The detection system is response speed and portable on account of the hollow-core of HC-PBGF to detect methane and make online detection more convenient.
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Received: 25 May 2018
Published: 10 October 2019
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