用2f可调光纤激光探测矿井瓦斯实现低限预警

矿井瓦斯成分很复杂,其主要成分是甲烷(CH4),其次是二氧化碳(CO2)和氮气(N2),还含有少量或微量的重烃类气体(乙烷、丙烷、丁烷、戊烷等)、氢(H2)、一氧化碳(CO)、二氧化硫(SO2)、硫化氢(H2S)等。作为瓦斯检测,后面的各种气体成分形成干扰噪声。采用2次谐波调制的光纤激光实现在多成分气体的背景噪声中实现矿井瓦斯低浓度监测,实现早期预警。

Low-limit Warning of Mine Gas by 2f-Detection Based on Tunable Fiber Laser

Mine gas composition is complex,and its main component is methane(CH4),followed by carbon dioxide(CO2) and nitrogen(N2),also contains a small amount or trace amount of heavy hydrocarbon gases(ethane,propane,butane,pentane,etc.),Hydrogen(H2),carbon monoxide(CO),sulfur dioxide(SO2),hydrogen sulfide(H2S) and so on.For gas detection,the gas compositions listed behind becomes interference noise.A second harmonic modulation of the fiber laser is used to achieve low concentration of coal mine gas monitoring agains...