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20 May 2009 Research on laser spectrographic to detect CH4 system
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In coal industries of our country, gas accident has become the principal contradiction which restricts safety in production of coal mining. Development of gas surveying system in coal mine has become an important project. In view of the flaws of the former chemistry examination method, Tunable Diode Laser Technology (TDLAS) can be used to survey gas. It can use an isolated absorption line of the gas molecular to survey absorption spectrum of gas, and use wavelength modulation and detect the second-harmonic (2f). The harmonic signal has direct proportion to absorption gas density N; it will obtain methane density in the gas after standard density methane gas spectral fitting. It can be known from theoretical analysis and actual survey, using deduction background method to eliminate the interference fringe is very effective. It may obtain very high selectivity and resolution. It has merits such as high sensitivity, high selectivity and rapid survey. So it can forecast and alarm gas accident.
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Mengran Zhou "Research on laser spectrographic to detect CH4 system", Proc. SPIE 7283, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 72832N (20 May 2009);

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