Optical fiber gas sensor for remote detection of CH4 gas in underground mines

Sanguo Li; Zhanxiong Wei; Zhifan Yin; Hong-Liang Cui

doi:10.1117/12.599837

9 May 2005 Optical fiber gas sensor for remote detection of CH₄ gas in underground mines

Sanguo Li, Zhanxiong Wei, Zhifan Yin, Hong-Liang Cui

Proceedings Volume 5770, Advanced Sensor Technologies for Nondestructive Evaluation and Structural Health Monitoring; (2005) https://doi.org/10.1117/12.599837
Event: Nondestructive Evaluation for Health Monitoring and Diagnostics, 2005, San Diego, CA, United States

Abstract

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.

Citation Download Citation

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); https://doi.org/10.1117/12.599837

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