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1 September 2006 Near-infrared fiber optics gas sensor for remote sensing of CH4 gas in coal mines
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In this paper, a particular equipment, one-channel optical-fiber-based methane gas real-time monitoring system, will be demonstrated. The system is designed especially for the mining complexes and residential area. A long-distance silica fiber link with a self-design optical gas sensor head have been employed in conjunction with a wavelength-tunable InGaAsP DFB laser diode at 1.64μm (around R(6) absorption peak of methane)1 to realize highly sensitive remote interrogation of CH4. By wavelength modulation with the DFB laser diode and a self-design processing circuit, sensitivities of less than 0.1 % (volume) have been achieved with the response time of less than 5 seconds.
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Sanguo Li, Yan Zhang, Thomas Koscica, and Hong-Liang Cui "Near-infrared fiber optics gas sensor for remote sensing of CH4 gas in coal mines", Proc. SPIE 6299, Remote Sensing of Aerosol and Chemical Gases, Model Simulation/Assimilation, and Applications to Air Quality, 62990Q (1 September 2006);

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