光纤瓦斯传感系统的研制

Study of CH_4 optical-fiber sensor structure

利用光电检测理论和波分复用技术,研制出安全型光纤瓦斯传感器。系统传感头利用CH4气体在1.331μm处的谐波吸收谱工作。系统采用双波长差分吸收的工作方式,其参考波长为1.27μm,消除了非光吸收的其他散射和微扰等影响。由微机用软件控制12位A/D/A转换卡进行数据采集与处理,系统分辨率达0.001%,实现了实时显示。该系统不仅能对瓦斯气体进行准确检测,而且由于采用了光学测量的方式,所以既安全又可靠,不仅可以应用于煤矿矿井内的瓦斯气体含量的实时测量,还可以实现远程监控。

The safety CH4 optical-fiber sensor is studied based on the optoelectronic measurement theory and wavelengthdivision multiplexer technology. By use of the CH4, the sensor of the system works in the harmonic absorption spectrum at 1. 331μm. The system works in dual-wavelength differential absorption mode and its reference wavelength is 1.27μm, so the effect of the dispersion and perturbation , except the light absorption, is eliminated. The resolution of the system has reached 0. 001% and the real-time display has been realized by the data acquisition and processing with A/D/A conversion card controlled by the software. The system may not only be used to accurately measure CH4, but also to operate safely and reliably because of the application of the optical measurement. Therefore, the system can be used for any coal mine to measure the concentration of CH4 in remote supervisory control mode.