Method and system of optical fibre interference type auto-monitoring for long distance pipeline safety monitoring

Abstract

The invention relates to an automatic monitoring method and system for long distance pipeline safety. It uses the monomode optical fiber laid near the distant pipeline, or the backup monomode optical fiber in the measured cable as sensing element; when the pipeline has leakage or the pipeline is damaged, the transmission character of the optical fiber will be changed, the light path difference of the laser in the two fibers will be changed; the change can be acquired with light interference method; at the same time, uses the affection of exterior force to the monomode optical fiber, and locating the position of the exterior on the pipeline. The several monitoring systems can be assembled into a network, thus the high sensitive, remote, real-time and automatic monitor to the long distance pipeline can be realized.

Description

technical field [0001] The invention belongs to the field of safety monitoring of long-distance oil, water, gas and other transportation pipelines and communication optical cables, and in particular relates to a method and a monitoring system for safety monitoring of long-distance pipelines using the principle of optical fiber interference. technical background [0002] Long-distance oil, water, gas and other transmission pipelines and long-distance communication optical cables are mostly distributed in the wilderness and other places where no one stays behind, and are easily damaged by external man-made and sudden natural disasters (such as earthquakes, landslides, etc.), leaking or breaking Wait for an accident. While these accidents caused huge economic losses, the leakage of oil and gas will also cause serious environmental pollution and other problems. Therefore, long-term real-time safety monitoring of pipelines buried in the field is particularly important, and how to...

AI Technical Summary

Problems solved by technology

Although the intensity-type distributed optical fiber sensor method can monitor the entire line of the pipeline and has a certain ability to monitor the effects of external events on the pipeline, but due to the defects of its principle, it has low detection sensitivity, short monitoring distance, and judgment threats. Insufficient capabilities such as poor event types

The method of using optical time domain reflectometer to monitor long-distance communication optical cable mainly has the disadvantages of poor sensitivity and inability to judge the type of event.

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