基于光缆振动的井下无源定位系统的研究

Study of mine passive location system based on fiber cable vibration

在矿井灾变时,针对被困矿工难于被定位的问题,根据干涉原理和φ-OTDR技术,提出一种基于光缆振动的井下无源定位的方法,以此为基础设计出井下无源定位系统。被困矿工敲击光缆引起的振动,包含了声音信息和位置信息,通过对音频数据分析可以区分出偶然性的振动和有规则的敲击振动,并对OTDR数据运算,可以获得振动的位置。试验结果表明,该系统能够还原振动声音和确定敲击位置,其定位距离的标准差在11m以内。

When mine disaster happens, aiming at the problem that the trapped miners are difficult to be positioned, according to the interference principle and the φ-OTDR technology, a method of underground passive location based on optical cable vibration is put forward in this paper, and a passive location system which based on this method is designed. The vibration caused by the trapped miners hitting the optical cable includes sound information and location information. By analyzing the audio data, it can distinguish accidental vibration and regular knocking vibration. By computing OTDR data, it can get the location of vibration. The test re- suits show that the system can reduce the vibration sound and determine the knocking position, and the standard deviation of the positioning distance is within 1 lm.