Mixing interference distributed optical fiber-based leakage detection device for underwater long-distance pipeline

Abstract

The invention discloses a mixing interference distributed optical fiber-based leakage detection device for an underwater long-distance pipeline. The mixing interference distributed optical fiber-based leakage detection device comprises an optical fiber sensing system, a signal demodulating system, a signal processing and communication system and a human-machine interaction system, wherein a small-coherent-length high-power light source of the optical fiber sensing system, an optical circulator, a first coupler, a delay optical fiber, a second coupler, a sensing optical fiber, a Faraday rotating mirror and a phase modulator constitute a Sagnac / Mach-Zehnder mixing interferometer; a light signal output by the interferometer is converted into an electric signal by the signal demodulating system, is demodulated, and is transmitted to the signal processing and communication system; a DSP (Digital Signal Processor) is used for processing signals, and determining leakage point position information; a 3G (three-generation) module is communicated with the human-machine interaction system; and monitoring information is displayed on the human-machine interaction system. The device can be usedfor detecting the leakage state of the underwater long-distance pipeline in real time, and has very high sensitivity and high positioning accuracy.

Description

technical field [0001] The invention belongs to the field of pipeline leakage detection, and in particular relates to a device for detecting leakage of underwater long-distance pipelines by using hybrid interference type distributed optical fiber sensing technology. Background technique [0002] Pipeline transportation has the advantages of low investment, short construction period, large transportation volume, low transportation cost, little impact on the ecological environment, convenient management, and high reliability. Long-distance pipelines have been widely used at home and abroad to transport oil and natural gas. With the development of offshore oil and gas fields, the health monitoring of long-distance underwater pipelines has received high attention, and the detection technology for the operation of long-distance underwater pipelines is also developing continuously. [0003] The existing safety detection systems for long-distance submarine gas pipelines include ray...

AI Technical Summary

Problems solved by technology

This makes the structure of the entire sensing system complex, which is not conducive to deployment on long-distance pipelines under complex underwater conditions, and the device does not have a real-time human-computer interaction system, which is not convenient for land personnel to manage the underwater pipeline in real time

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