OPTICAL FIBER GRATING TEMPERATURE-SENSING MONITORING SYSTEM AND METHOD FOR COAL-MINING WORKING SURFACE GOAF IN COAL MINE

摘要

An optical fiber grating temperature-sensing monitoring system for a coal-mining working surface goaf in a coal mine. Between 3 and 5 monitoring stations (10) are distributively arranged within a goaf (12). Each monitoring station (10) comprises between 10 and 12 optical fiber grating temperature sensors (11). In each monitoring station (10), the optical fiber grating temperature sensors (11) are serial-connected therebetween via optical fiber pigtails (100). The lead-out end optical fiber pigtails (100) of the optical fiber grating temperature sensors (11) are connected to communication optical fibers (80 and 81). The communication optical fibers (80 and 81) are connected to a mining-use transmission optical fiber cable (6) via an optical fiber termination box (7). The mining-use transmission optical fiber cable (6) is connected to an input end of the optical fiber grating static demodulator (1). An output end of the optical fiber grating static demodulator (1) is connected to a monitoring computer (2). Also, optical fiber grating temperature-sensing monitoring method for the coal-mining working surface goaf in the coal mine. This allows for implementation of high precision in temperature measurements, convenient installation, simplified method, and large-area, long-distance, wide-range, remote, long-term, real-time, and online monitoring of the temperature of the coal-mining working surface goaf, and provides early warning and overrun alarm with respect to fire hazards, thus greatly reducing occurrence of accidents of spontaneous combustion of goaf coal.