9 May 2005 Optical fiber gas sensor for remote detection of CH4 gas in underground mines
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An optical-fiber-based gas sensor for CH4 gas real-time monitoring has been developed and tested. A long-distance silica fiber link with compact single-path or multi-path gas cells has been employed in conjunction with a wavelength-tunable. InGaAsP DFB laser diode at 1.64μm (at the R(6) absorption peak of methane) to achieve highly sensitive remote interrogation of CH4 with potential application in the mining complexes and residential areas. By wavelength modulation with the DFB laser diode, multi-path gas cell and a self-design processing circuit, sensitivities of less than 1% of lower explosive limit (LEL) had been achieved in the laboratory.
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Sanguo Li, Zhanxiong Wei, Zhifan Yin, and Hong-Liang Cui "Optical fiber gas sensor for remote detection of CH4 gas in underground mines", Proc. SPIE 5770, Advanced Sensor Technologies for Nondestructive Evaluation and Structural Health Monitoring, (9 May 2005); doi: 10.1117/12.599837; https://doi.org/10.1117/12.599837

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