Pipeline Impact and Leak Location Method Based on Distributed Fiber Bragg Grating Sensing Network

A distributed optical fiber and grating sensing technology, which is applied in the pipeline system, gas/liquid distribution and storage, mechanical equipment, etc., can solve the problem of low measurement accuracy of the sensing system, no consideration of environmental temperature changes, and high requirements for placement, etc. problems, to achieve the effect of improving sensitivity, solving location limitations, and solving limitations
CN104595727BActive Publication Date: 2016-12-07CHONGQING UNIV OF POSTS & TELECOMM
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
CHONGQING UNIV OF POSTS & TELECOMM
Publication Date
2016-12-07

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Abstract

The invention relates to a pipeline impact and leakage locating method based on a distributed FBG (Fiber Bragg Grating) sensing network, and belongs to the technical field of sensing application of an optical fiber sensor. The method comprises the steps of establishing a sensing probe based on a cantilever structure by combing two FBGs with the same performance parameters; removing the environment temperature interference according to the same temperature and different strains of an environment where the FBGs at two sides of the sensing probe are located so as to simultaneously increase the sensitivity of the sensing probe; establishing a leakage detection sensing layer by adopting polymer to be combined with an elastic plastic thin film; conducting tiny deformation by using a smooth and easy-to-bend metal wire to solve the limitation of an installation position of a traditional FBG pipeline detection sensor and simultaneously increase the sensitivity of a sensing system; taking a difference value of wavelength shift distances of the FBGs at two sides of the sensing probe as a sensing signal, and seeking two probes with the largest sensing signal variable quantities and combining the distance between the two probes to realize dangerous point location.
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Description

technical field

[0001] The invention belongs to the technical field of sensing applications of optical fiber sensors, and relates to a pipeline impact and leakage positioning method based on a distributed optical fiber grating sensing network. Background technique

[0002] Fiber Bragg grating (FBG) sensor has the advantages of small size, high sensitivity, wide dynamic range, anti-electromagnetic interference, corrosion resistance, high reliability, easy serial multiplexing, and does not affect the structural characteristics of the host material, etc., and is widely used In aerospace, shipbuilding industry, civil engineering, petrochemical industry, nuclear industry and medical engineering and other fields.

[0003] With the development of my country's economy, a large number of oil pipelines have been established for the transportation of energy such as oil and gas. Due to pipeline aging, natural disasters and illegal intrusion, leakage incidents have occurred frequently, ...

Claims

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