基于光纤传感检测的矿井人员定位方法

Mine Personnel Orientation Method Based on Optical Fiber Sensing Detection

针对矿井发生重大灾害时由于断电、突水等因素造成的通信中断,人员定位困难问题,基于相位敏感光时域反射机理,提出了受困人员拍击井下既有通信光缆定位的方法。通过分析施加振动对光相位的影响规律,从理论上证明解调光相位可实现振动信号的提取及定位。实验选取拍击、20 Hz方波与200 Hz正弦波来模拟外界振动信号,采集信号经差分累加去噪,最后通过拟合算法实现振动波形还原。实验证明,在12 km长度光纤上,系统对1 kHz以下振动信号具有良好的频率响应特性。选取4.633 km处与10.022 km处模拟单次拍击固定点的重复性实验,综合定位误差范围为-7 m^+11 m。研究表明该方法可应用于井下通信中断应急救援时的人员定位,为快速确定受困人员位置提供一种新的解决方案。

Aiming at the problem of personnel orientation difficulty due to communication interruption caused by power failure and water inrush when major disaster happens in coalmine,a mine personnel orientation method through clapping the existing communication cable is proposed based on phase-sensitive optical time domain reflection mechanism.By analyzing the effect of applied vibration on optical phase,the vibration can be extracted and located.In the experiment,vibration signals are simulated by handclapping,20 Hz square waves and 200 Hz sine waves.The acquired signal is de-noised by differential accumulation and vibration waveform is recovered by applying fitting algorithm.The system exhibits good frequency response for vibration below 1 kHz over 12 km fiber length.Repetition tests are carried out on 4.633 km and 10.022 km,and the location error is within-7 m to+11 m.Therefore,the proposed system provides a new solution for rapid position determination,which can be applied for personnel orientation in emergency rescue.