Apparatus and method for monitoring pipeline leakage based on distributed optical fiber acoustic sensing technology

Abstract

The invention relates to a channel leakage detector and method based on distributed optical fiber acoustic sensing technique, which comprises an optical system (1), a distributed optical fiber sensing system (2), and a detecting system (3). Wherein, the optical system comprises a board band continuous light resource A1, and an optical circulator A2; the distributed optical sensing system comprises the first coupler A3, the delay coil B4, and a reflective mirror A5l; the detecting system comprises an optical-electric converter A6, a demodulate system A7, a A / D converter A8, and a computer A9; the board band continuous light resource via the optical circulator is connected to the Port1 interface of the first coupler A3, whose Port2 and Port3 are connected with delay coil; the Port4 of first coupler via sensing optical fiber is connected to the reflective mirror; and the optical circulator is connected to the optical-electric converter of detecting system, while said system can detect any leakage signal at any time.

Description

technical field [0001] The invention relates to a device and a method for monitoring pipeline leakage by adopting interference-type distributed optical fiber acoustic sensing technology, belonging to the field of pipeline leakage monitoring. Background technique [0002] Pipeline is one of the five current means of transportation. It has the advantages of low cost, energy saving, high safety and stable supply in the transportation of liquid, gas and slurry. It is irreplaceable in industries such as petroleum, chemical industry, natural gas and urban water supply. role. With the continuous development of the pipeline transportation industry, in order to maintain the safe operation of the pipeline, the pipeline operation monitoring technology is also constantly developing. [0003] In recent years, with the development of optical fiber sensing technology, long-distance distributed optical fiber sensing technology has also begun to be applied to pipeline leak detection. China...

AI Technical Summary

Problems solved by technology

The disadvantage of this technology is: because the distance between the two sensing fibers of this technology is relatively close, the vibration along the pipeline may cause the phase delays of the two sensing fibers to be consistent. At this time, no interference occurs, that is, a reciprocity effect occurs. And when the leak port is away from the direction of the optical cable, it is difficult to detect the leak

The positioning method also has deficiencies. Only when the start time of the pipeline leakage event is captured can the location be located. When the leakage has occurred, this type of detection technology no longer has the ability to locate the leak point.

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