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...

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