子环分布式光纤定位矿井救援系统设计

Design of Sub-Ring Distributed Optical Fiber Positioning System in Mine Rescue

为解决矿难发生时井下人员的定位问题,提出子环分布式光纤定位系统。该系统利用光纤环干涉原理,将一子环通过3 dB的耦合器耦合到主环上,光束分别传输过子环n次,产生不同的输出干涉光束。通过干涉光和振动信号特征之间的关系获得振动位置。计算与仿真比较的结果表明,该系统可较精准地检测到主环内的震动位置,误差相对较小。在矿难发生时,该系统通过矿工敲动地面或巷道壁得到震动信号,可以较精准地检测到矿工的具体位置,为矿难援救提供了科学依据。

In order to solve the problem of locating underground personnel when the accident happens, a simple distributed vibration sensor system is proposed which employs an optical fiber ring interferometer having an additional sub-loop coupled with a main ring by a 3 dB coupler according to the advantages and disadvantages of communication system under mine. Comparing multiple responses of interfered beams by the lights travelling n times in the sub-loop, the proposed system can detect the position and the amplitude of acoustic vibration occurred in the main ring. By simplifying the calculation, the optical fiber vibration position obtained. The calculated values are compared with the actual value, it is showed that the system can detect the shock position very accurately with smaller error. When accident happened, miners strike the ground or wall to get vibration signal, it can detect the specific location of the miners providing a good basis for mine rescue.