Acta Optica Sinica, Volume. 42, Issue 19, 1906003(2022)
Methane Gas Detection Based on Anti-Resonant Hollow-Core Fiber
A methane gas detection device based on anti-resonant hollow-core fibers is presented. A distributed feedback laser with a center wavelength of 1653 nm is combined with anti-resonant hollow-core fibers with a length of 1.8 m. The methane gas is detected in real time with a technique integrating tunable diode laser absorption spectroscopy with wavelength-modulation spectroscopy. A fiber coupling device of a ceramic ferrule and a ceramic sleeve is used to achieve stable butt-coupling between hollow-core fibers and single-mode fibers. Then, a lensless all-fiber gas detection device is built, and experiments are carried out on methane gas with different concentration gradients. The results show that there is a good linear relationship between the peak-to-peak value of the second harmonic signal and the gas concentration, and the linear correlation coefficient is R2=0.997. The accuracy of the volume fraction of the methane gas obtained by the wavelength modulation technique through inversion is 0.918×10-6, and the relative accuracy is 1.3%. The stability of the system is evaluated by the Allan variance, and the lowest detection sensitivity of the device is 13×10-9 when the averaging time is 66.8 s.
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Beibei Si, Jiaxiang Liu, Ganshang Si, Zhengang Li, Zhiqiang Ning, Yonghua Fang. Methane Gas Detection Based on Anti-Resonant Hollow-Core Fiber[J]. Acta Optica Sinica, 2022, 42(19): 1906003
Category: Fiber Optics and Optical Communications
Received: Feb. 21, 2022
Accepted: Apr. 1, 2022
Published Online: Oct. 18, 2022
The Author Email: Fang Yonghua (yhfang@aiofm.ac.cn)