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18 April 2003 Remote laser analyzer for methane sensing in the air of subterranean spaces
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The paper concerns with calculative and experimental development of a remote electric-discharge DF-laser analyzer for subterranean methane monitoring up to its explosive concentrations. The analyzer is built using a lidar scheme when the probing emission is reflected by artificial or natural object located in a subterranean measurement path. Methane records in the air are made using the differential absorption technique. The required metrological parameters of the analyzer are reached with the multi-frequency laser atmospheric control. A block diagram of the methane analyzer is given together with procedures to probe mine media with many frequencies in the spectral range from 3.6 to 3.8 μm. The lidar model was tested under conditions simulating physical values of the subterranean air: (1) methane air content -- up to 3% vol.; (2) dust content -- about 10 mg/m3; (3) probing path length -- about 50 m.
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Yuri N. Frolov, Sergey D. Velikanov, Victor I. Lazarenko, Yuriy N. Aksenov, Sergey N. Sin'kov, and Aleksey V. Nadezhkin "Remote laser analyzer for methane sensing in the air of subterranean spaces", Proc. SPIE 4882, Remote Sensing of Clouds and the Atmosphere VII, (18 April 2003);

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