Fiber Laser Methane Sensor and Its Application in the Fire Prevention of Coal Goaf

摘要

Using the technology of tunable diode laser absorption spectroscopy and the technology of microelectronics,a fiber laser methane sensor based on the microprocessor C8051F410 is given. We use the DFB Laser as the light source of the sensor. By tuning temperature and driver current of the DFB laser,we can scan the laser over the methane absorption line, then we realize the methane detection. It makes the real-time and online detection of methane concentration of the coal goaf to be true,and it has the advantages just as high accuracy,immunity to other gases ,long calibration cycle and so on. The sensor has the function of self-diagnose,By detecting the parameters such as the voltage, the soft will alarm when the probe in a fault status, then it improve the dependence of the measurements. In coal mine production process,it has great significance to realize the detection of methane in the fire prevention of coal goaf. The article gives the application scheme of the sensor in fire prevention of coal goaf,At last we give some analysis of the data from the application field and then we have a look of our next work in the distance.