基于激光吸收光谱的矿用光纤二氧化碳监测系统研究

Research of Mining Optical Fiber CO_2 Monitoring System Based on TDLAS

二氧化碳是煤矿采空区自然发火预测预警的主要标志性气体之一,二氧化碳的浓度直接影响煤矿的生产安全。提出一种新型光纤二氧化碳监测系统,采用可调谐二极管激光吸收光谱(TDLAS)技术,二氧化碳气体浓度直接利用最小二乘方法拟合得出,实现了单点数据标定。与电子式二氧化碳检测仪对比,改进的光纤二氧化碳监测系统不仅大大提高了系统的可操作性,便于现场操作,而且能够实时在线监测采空区二氧化碳气体浓度,具有较高的检测精度和灵敏度。将该系统用于煤矿束管系统中,能够更好的满足煤矿安全生产的需求,具有良好的应用前景。

Carbon dioxide （CO2 ） is one of the important signal gases for forecasting and warning of the spontaneous combustion in the waste of coal mine. The CO2 concentration directly affects the production safety of the mine. Proposes a novel optical fiber CO2 monitoring system adopting tunable diode laser absorption spectroscopy （TDLAS）. The CO2 concentration is calculated by the least square fit （LSF）. Achieves the data calibration by single point. Compares to the electronic CO2 detector, the monitoring system not only improves the operability, facilitates field operations, but also achieves real- time on -line monitoring CO2 concentration in the waste. And this system also has higher detection accuracy and sensitivity. Its application to beam tube system in coal mine will be more fine to meet the needs of production safety, and be of good prospect.