基于可调谐半导体激光吸收光谱的瓦斯监测方法研究

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 sensing by near-infrared tunable diode laser spectroscopy method

Gas explosion is the main menace of coal mining industry. Accurate,real-time measurements of gas concentration and giving an alarm are effective way for gas disaster management. The application of near-infrared tunable diode laser spectroscopy in coal mine gas measurement was experimentally studied,the system used 1.65μm near-infrared DFB laser as light source,and through fibre optic to make the signal transmit,the system detection limit was less than 0.09% through combining wavelength modulation and second harmonic detection technology,the fast sample speed could attain 0.02s per measurement.The study results show that the technology has characteristic of real-time,successive,non-intrusive and multi-point measurements,and can meet the requirements of coal mine gas measurement.