Transportation pipeline vibration pick-up leakage detection method based on low-reflection chirp grating array

Abstract

The invention provides a transportation pipeline vibration pick-up leakage detection method based on a low-reflection chirp grating array. The method comprises the steps that a plurality of vibration sensors are sequentially arranged in a weak grating array sensing optical cable at equal intervals, wherein the vibration sensors are made of chirp gratings; the weak grating array sensing optical cable is laid above a to-be-detected pipeline in a direction parallel to the axis of the pipeline; the tail end of the weak grating array sensing optical cable is in signal connection with a computer through a fiber grating demodulator; time domain information and frequency domain information of each vibration sensor are obtained and recorded under the condition that the pipeline is free of leakage to form a database; then the real-time time domain information and the real-time frequency domain information of each vibration sensor are compared with time domain information and frequency domain information recorded in the database to conduct leakage judgment, and if it is judged that leakage happens to a monitoring point corresponding to the vibration sensor, the specific position of the vibration sensor is positioned, and then troubleshooting and overhauling are conducted. According to the invention, the design is not only high in monitoring precision, but also easy to implement.

Description

Technical field [0001] The present invention relates to a method of transporting a pipeline pick-up leak detection method, which belongs to the technical field of pipeline leakage detection, in particular a transmission conduit pickup leak detection method based on a low reflection 啁 光 grating array. Background technique [0002] Pipe transport is one of the five major transportation methods. For long-distance delivery of liquid and gas materials, mainly including media such as oil, natural gas, playing a pivotal role in national development. Therefore, security is the life of pipe transportation. Pipeline leaks are the main factors affecting pipeline safety, and the corrosion of pipelines, and sudden natural disasters (such as earthquakes, landslides, river flushing) and human destruction will cause pipeline leaks and even rupture, directly threaten the safe operation of long-distance pipelines. . [0003] In recent years, there have been happening in the incident of pipelines, ...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects and problems existing in the prior art that it is difficult to take into account the difficulty of implementation and the accuracy of monitoring, and to provide a pick-up device for transportation pipelines based on a low-reflection chirped grating array that has high monitoring accuracy and easy implementation. Vibration leak detection method

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