Optical fiber sensing natural gas pipeline leakage accident recognition device

Abstract

The invention relates to an optical fiber sensing natural gas pipeline leakage accident recognition device and relates to the technical field of mechanical vibration measuring, impact measuring and pipeline systems. The optical fiber sensing natural gas pipeline leakage accident recognition device comprises a light source, a transmission optical path part, optical fiber sensors, a photoelectric detector and a signal collecting and processing module. The optical fiber sensors are installed on a pipeline body at certain intervals and form optical fiber sensor groups, each optical fiber sensor group is connected with a beam splitter serially connected in optical fibers through an optical fiber and then is connected with the light source and photoelectric detector at the receiving end, and the output of the photoelectric detector is connected with the signal collecting and processing module which is connected with a microcomputer. Through processing of the signal collecting and processing module, the sensor group signals mixed based on a frequency division multiplexing mode achieve demultiplexing of sensors in the sensor groups to obtain original leakage vibration wave signals. The optical fiber sensing natural gas pipeline leakage accident recognition device can timely monitor abnormal signals at the primary stage of pipeline leakage and is high in alarming accuracy.

Description

technical field [0001] The invention relates to an optical fiber sensing natural gas pipeline leakage event identification device, which 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 delivery...

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] The traditional acoustic sensor-based leak detection method uses a pressure sensor that needs to be powered as the sound signal pickup device. Usually, two sensors are installed at both ends of the pipeline entering and leaving the station or valve chamber, and only one time difference can be obtained in the leakage signal acquisition. The positioning accuracy of leakage events is poor, and due to the narrow signal channel obtained, it is difficult to distinguish leakage from random vibration interference, and the system has many false alarms

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