The Development Of Fiber Ethylene Gas Concentration On-Line Detecting System Based On Tdlas

Spontaneous combustion in coal goaf area is one of major disasters in coal mines. Detection technology based on signature Gas is the primary means of spontaneous combustion forecasting of coal goaf area, and Ethylene is an important milestone in gases in the accelerate oxidation stage of coal. A Fiber Ethylene gas concentration online detecting system is proposed based on TDLAS (tunable diode laser absorption spectroscopy) technology. The System uses the wavelength 1.623 urn near-infrared band fiber-coupled distributed feedback laser (DFB) as the light source, Combined wavelength modulation spectroscopy and harmonic detection technique, developed a fiber-coupled white-type long-path gas absorption cell, to achieve high sensitivity(ppm level) detection of gas concentration to meet the fire forecast need for Coal goaf area. There are obvious advantages Compared with the existing beam tube monitoring system in coal mine.