Monitoring technology for complex state of pipeline route based on optical fiber sensing

It has been a hot research topic at home and abroad to sense the vibration, strain and temperature by communication optical fibers, so as to monitor and position the threat events along the pipeline, but how to realize the fusion and application of the sensed data is still in the exploration stage. Based on the principle of optical fiber sensing, the joint monitoring method for vibration, strain and temperature of optical cables accompanying the pipeline was proposed. Vibration data can be used for length alignment and third-party activity monitoring, the strain data for lateral displacement monitoring and temperature data for leakage monitoring and other abnormal operation analysis. The multi-dimensional monitoring data are subjected to joint analysis and interactive verification after spatial length alignment and time alignment, so that the false alarm rate can be further reduced. The fusion and application of 3 kinds of sensed data could realize the sensing of pipeline state under complex conditions and provide technical support for safe operation of pipelines.