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以甲烷为主要成分的瓦斯气体有易燃易爆特性,在进行高瓦斯矿采掘时极易发生瓦斯爆炸,实时监测矿井瓦斯浓度是煤矿安全预警的重要任务。利用基于波长调制的可调谐半导体激光吸收光谱技术(TDLAS)的高灵敏度、高选择性、快速响应特点和光纤传感技术的抗电磁干扰、防燃防爆、可远程控制的优点实现了多点瓦斯的实时监测。分析研究了光强变化对气体浓度反演的影响,验证了I2f/I1f的方法能有效的减小监测浓度值的波动,系统瓦斯检测限<0.05%。
Gas with methane as the main component has flammable and explosive properties. It is very prone to gas explosion during the gas extraction of high-gas mines. It is an important task for coal mine safety monitoring to monitor gas concentrations in real time. Using the advantages of high sensitivity, high selectivity and fast response of tunable semiconductor laser absorption spectroscopy (TDLAS) based on wavelength modulation and anti-electromagnetic interference of optical fiber sensing technology, flameproof and explosion proof, and remote control, multi-point gas Real-time monitoring. The influence of light intensity on the inversion of gas concentration was analyzed and verified. The method of I2f / I1f can effectively reduce the fluctuation of monitoring concentration. The gas detection limit of the system is less than 0.05%.