A method for identifying and locating illegally invading subway lines by drilling rigs based on ultra-weak Bragg fiber optic grating sensing array
LI Sheng1,QIU Yang2,3,NAN Qiuming1,GAN Weibing1,JIANG Jinpeng1
1.National Engineering Research Center of Fiber Optic Sensing Technology and Networks，Wuhan University of Technology, Wuhan 430070, China;
2.School of Information Engineering, Wuhan University of Technology, Wuhan 430070, China；
3.Xiaomi Inc, Wuhan 430070, China
Abstract：Real-time monitoring and timely warning of illegal intrusion of drilling rigs above the subway line are significant for subway safety management. Distributed optical fiber sensing technology is an effective measure to meet the needs of long-distance, remote real-time monitoring. To detect and locate the illegal intrusion of drilling rigs above the subway line in time, the ultra-weak fiber optic Bragg grating sensing array is used to collect the distributed vibration response caused by the drilling rig intrusion event. Based on the vibration signal characteristics of the drilling rig equipment engine, a method that can identify and locate the illegal intrusion of the drilling rig in real time is proposed. Field test results show that the method can resist ground and underground traffic load interference, and can accurately and timely identify and locate simulated drilling rig intrusion events.
Key words: illegal invasion; subway tunnel; ultra-weak Bragg fiber optic grating; distributed vibration; drilling rig
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