Double-Sagnac pipeline safety monitoring system

Abstract

The invention provides a double-Sagnac annular fiber optic interferometer sensor and belongs to the technical field of an optical sensor. According to the double-Sagnac annular fiber optic interferometer sensor, an optical fiber which is paved along a pipeline is used as a sensing optical fiber; when destructive disturbance happens closely to the pipeline, a vibration sound source is generated on the ground surface; a soil layer is used as a propagation medium to cause a partial vibration effect on the optical fiber in a cable; the vibration can modulate an optical signal transmitted in the optical fiber and a terminal of the cable utilizes a light signal receiving device to obtain a needed result; and data signal analysis treatment and safety evaluation are carried out. The optical fiber is paved along the pipeline and is located below the pipeline; a rubber layer is arranged at the outer part to protect; and an excitation end and a receiving end are connected in a serial connection manner to be used for exciting and receiving signals. According to the double-Sagnac annular fiber optic interferometer sensor, the phenomena that other methods cannot carry out in-time monitoring on possible destructive behaviors and cannot carry out in-time positioning on a damaged or disturbed place can be solved, so that the monitoring time, the monitoring range and the judging precision are effectively improved.

Description

technical field [0001] The present invention designs a sensor system based on double Sagnac optical fiber interferometers, which belongs to the technical field of optical sensors. Processing and analysis, so as to monitor whether there are destructive disturbances such as oil theft or man-made along the pipeline within the monitored range, and locate the place where the disturbance occurs. The sensor system can be used for long-distance safety monitoring of oil and gas pipelines to achieve effective early warning monitoring. Background technique [0002] At present, traditional methods such as manual inspection, mass balance method, stress wave method, and acoustic wave method are mostly used to determine whether oil theft or other human factors threaten safe production and operation along the pipeline, and determine the location of the behavior. The efficiency is low, there are many misjudgments and blind spots, and the behaviors that cause pipeline damage cannot be monito...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the vibration signal generated by the external disturbance in the pipeline safety monitoring cannot be measured accurately and in real time, as well as the online real-time positioning of the disturbance signal occurrence position, and proposes a distribution system for real-time pipeline safety monitoring. fiber optic sensor system

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