Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Optical fiber distributed type monitoring method for long-distance conduit wiring safe monitoring and its device

An optical fiber distributed and safety monitoring technology, applied in the pipeline system, gas/liquid distribution and storage, mechanical equipment, etc., to achieve high detection sensitivity, high positioning accuracy, and wide application

Inactive Publication Date: 2008-07-09
UNIV OF ELECTRONICS SCI & TECH OF CHINA
View PDF3 Cites 22 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the two interfering lights of the Sagnac interferometer experience an absolutely equal distance, and there is no requirement for the line width of the light source. Therefore, a Sagnac interferometer that meets certain conditions may constitute a long-distance safety monitoring system.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Optical fiber distributed type monitoring method for long-distance conduit wiring safe monitoring and its device
  • Optical fiber distributed type monitoring method for long-distance conduit wiring safe monitoring and its device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030] specific implementation

[0031] The automatic monitoring method for long-distance pipeline safety of the present invention uses single-mode optical fiber cables laid in parallel with the pipeline near the pipeline as distributed optical fiber sensing elements, and when an external force acts on the optical fiber, the transmission characteristics of the optical fiber will change , using optical fiber interferometry to perceive the weak effect and influence of external events on pipelines and optical cables, and then use frequency spectrum analysis to extract the frequency domain characteristics of the external event, based on which the location of the event can be judged. Utilize computer database technology to accumulate, collate and analyze event types and issue different levels of alarms.

[0032] Embodiments of the present invention are as follows:

[0033] 1. Lay two single-mode optical fiber cables in parallel with the pipeline near the pipeline as distributed op...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a fiber distributed monitoring method and device for the safety monitoring of a long-distance pipeline. By using a fiber Sagner interferometer fiber consisting of a laser, a 2 is multiplied by 2 coupler and two optical fibers arranged in parallel to the long-distance pipeline, the invasion or leakage events are detected based on the interference signal caused by oscillation phenomenon. An optical fiber delay line is preset at the emergence end of either of the two optical fibers under the condition that the two optical fibers oscillate at the same time. An optical fiber delay line is preset at the farthest end under the condition that either of the two optical fibers oscillates. The interference factor is compensated by means of periodic narrow pulses, record light source fluctuation and equilibrium demodulation, thereby realizing the long-distance pipeline safety detection with high sensitivity. The invention also uses a computer database to store and sort data, analyze the event type and give alarms of different levels. The invention utilizes low-cost mobile modules to combine a plurality of independent devices distributed along the long-distance pipeline and thus to form the long-distance wireless monitoring system, and realizes the roll call measurement, periodic measurement and data upload.

Description

Technical field [0001] The invention belongs to the safety monitoring in the field of resource and information transmission, such as the safety monitoring of oil, water, gas and other transmission pipelines and communication optical cables, and specifically relates to a method for safety monitoring of long-distance pipelines using the optical fiber Sagnac interference principle device. Background technique [0002] Security risks in the field of resource and information transmission are common. Such as natural gas pipelines due to corrosion leakage due to sulfur and other reasons or external man-made, sudden natural disasters (such as earthquakes, landslides, etc.) damage, leakage or damage and other accidents. In recent years, the absolute security of optical fiber information transmission has been broken, and eavesdropping incidents on terrestrial optical cable lines have been reported frequently, and the U.S. Central Intelligence Agency’s submarine optical cable eavesdro...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): F17D5/02
Inventor 张利勋刘永智彭增寿代志勇欧中华
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products