Detection and Analysis of disturbance signal of Cable Tunnel based on Optical Fiber Vibration Sensors

Cable tunnel is easily affected by external force, such as excavating equipment, which leads to abnormal cable and affects normal transmission. In order to detect the abnormal phenomenon of cable tunnel in time, the optical fiber sensing technology is used to monitor the cable tunnel in real time. Four fiber vibration sensors are installed on the roof of cable tunnel and connected to the self-developed optical fiber microseismic monitor. Different vibration signals are simulated directly above the cable tunnel, the time domain and frequency domain information generated by the vibration signal are analyzed, and the source type of the disturbed cable tunnel is identified in order to protect the cable tunnel in time. The results show that there are obvious differences in the main frequency produced by different source types, and the source information can be classified according to different main frequency signals, especially the information of external force damage, so as to protect cables in time and ensure the safety of electricity consumption.