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瓦斯爆炸是煤矿安全的主要威胁,对瓦斯气体浓度进行准确、快速、实时监测和预警是治理瓦斯灾害的有效手段。实验研究了近红外半导体激光吸收光谱技术在煤矿瓦斯气体安全检测中的应用。系统光源采用的是1.65μm波长的近红外可调谐DFB激光器,使用了波长调制和二次谐波检测技术,通过光纤进行信号传输。系统检测限低于0.09%,气体浓度的检测速度最高可达到0.02s。研究表明:该技术具有实时、连续、快速、非接触检测的特点;现场无带电部件,具有多点分布式遥测的能力,能够满足煤矿瓦斯安全检测的要求。
Gas explosion is the main threat to the safety of coal mines. Accurate, rapid and real-time monitoring and early warning of gas concentration is an effective means of controlling gas disasters. The application of near infrared semiconductor laser absorption spectroscopy in gas detection of coal mine gas was experimentally studied. The system light source uses a near-infrared tunable DFB laser with a wavelength of 1.65 μm and uses wavelength modulation and second harmonic detection techniques for signal transmission over optical fibers. System detection limit of less than 0.09%, the detection rate of gas concentrations up to 0.02s. The research shows that the technology has the characteristics of real-time, continuous, fast and non-contact detection. The live uncharged components have the ability of multi-point distributed telemetry to meet the requirements of coal mine gas safety detection.