Optical fiber sensor for detecting natural gas pipeline leakage

Abstract

The invention relates to an optical fiber sensor which is suitable for a natural gas pipeline leakage detection system. The optical fiber sensor consists of an elastic cylinder (3), a fiber optic interferometer (4) and a tail fiber disk fiber box (5), wherein interference arms of the fiber optic interferometer are uniformly and orderly wound on the periphery of the elastic cylinder (3); an optical fiber and the elastic cylinder are tightly bonded together by using a bonding agent; the fiber optic interferometer left after winding and relevant devices of the fiber optic interferometer are orderly wound in the tail fiber disk fiber box (5); the tail fiber disk fiber box (1) is fixed on the top of the elastic cylinder (3) by using a bonding agent; the elastic cylinder (3) is a steel short cylinder of which the bottom is inwardly depressed and the radian is consistent with that of the outer surface of a pipeline; and during installation of the sensor, the inwardly-depressed end of the elastic cylinder (3) is bonded on the surface of a natural gas pipeline by using a bonding agent. A front end probe with high positioning accuracy and high sensitivity is provided for a quasi-distributed natural gas pipeline leakage detection system.

Description

technical field [0001] The invention relates to an optical fiber sensor suitable for a natural gas pipeline leakage detection system, and relates to the technical fields of mechanical vibration measurement, impact measurement and pipeline system. Background technique [0002] At present, the total length of pipelines built in the world has reached 2.5 million kilometers, which has surpassed the total mileage of railways and has become the main mode of energy transportation in the world. Oil transportation in developed countries and oil-producing regions in the Middle East has all realized pipelines. my country's pipelines have also developed rapidly in recent years, with a total length of more than 70,000 kilometers. A large energy pipeline network has initially formed across the east, west, north and south, covering the whole country, and connecting overseas. Pipeline transportation has become the deployment of strategic energy such as oil and gas. The main method of deliver...

AI Technical Summary

Problems solved by technology

However, this type of technology is affected by interference events around the pipeline when monitoring leakage, has a high system false alarm rate, and has poor anti-interference ability

[0011] Throughout the various pipeline leakage monitoring technologies at home and abroad, the current commonly used negative pressure wave method, flow balance method, pressure slope and other oil pipeline leakage detection technologies cannot effectively solve the problem of gas pipeline leakage detection, especially for Identification and location of tiny leaks

Based on the good sensing characteristics of optical fibers, optical fiber sensing technology has been developed rapidly. Among them, an optical cable laid in the same ditch as a pipeline is used as a gas leakage sensor. Although the sensitivity is higher than that of traditional technologies, its positioning effect is poor. , can not fully meet the application requirements of natural gas pipeline leakage monitoring

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