Pipeline monitoring method based on distributed fiber sensors and acoustic wave

Abstract

The invention discloses a pipeline monitoring method based on distributed fiber sensors and acoustic wave. The method includes the steps of laying distributed fiber sensors in a pipeline monitoring area, installing acoustic sensor units at two ends of a pipeline or on the pipeline section by section, and monitoring the pipeline in real time with both the distributed fiber sensors and the acoustic sensor units; providing optical power detection modules for the distributed fiber sensors, and providing an acoustical signal receiving and processing device for the acoustic sensor units; in case of leakage of the pipeline, judging the condition by making comprehensive use of leakage signals detected by the distributed fiber sensors and leakage signals detected by the acoustic sensor units. The pipeline monitoring method based on the distributed fiber sensors and acoustic wave has the advantages that the distributed fiber sensing technique and the acoustic detection technique are combined and are mutually complementary, false alarm rate is reduced, and positioning precision is improved.

Description

[0001] technical field [0002] The invention relates to a pipeline monitoring method, in particular to a pipeline monitoring method based on distributed optical fiber sensors and acoustic waves, which is used for real-time on-line monitoring of pipeline leakage to realize accurate automatic early warning. [0003] Background technique [0004] With the improvement of social economy and people's living standards, there are more and more various building groups, and the supporting water, electricity, heating, gas and other pipelines, wires and cables, and communication optical cables and other pipelines extend underground. Security is an important part that cannot be ignored in urban construction. [0005] At present, external detection methods can be used for pipeline leakage monitoring, mainly including negative pressure wave detection method and acoustic emission detection method. The negative pressure wave detection method can quickly determine the occurrence of pipelin...

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Problems solved by technology

[0011] However, although the distributed optical fiber can monitor the whole line, that is, every point can be sensed, but in the application of underground pipeline monitoring across a wide area and the construction environment is uncertain, due to the overly sensitive characteristics of the distributed optical fiber, it is easy to cause false alarms The occurrence of the situation has a high false alarm rate of the system and poor anti-interference ability

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