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Distributed multi-node cooperative fiber bragg grating sensor fault positioning method

A fiber Bragg and grating sensor technology, which is applied in the field of optical sensing technology, fiber Bragg grating and intelligent algorithm applications, can solve the problems of signal loss, light intensity attenuation, FBG sensor performance degradation, etc., and achieve the effect of precise positioning

Active Publication Date: 2019-10-11
FUZHOU UNIV
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Problems solved by technology

[0004] At present, the research on FBG sensor fault detection only stays at the level of external structural damage such as FBG node damage and fiber line breakage, and does not judge the abnormal state of fault data in the FBG sensor network. Extreme environments and limited by current technology will inevitably lead to performance degradation. Therefore, even if the external structure of the FBG sensor has not been broken or damaged, there will be failures of the entire network due to abnormal sensor data in the network.
According to the abnormal state of the fault data in the FBG sensor network, the faults of the FBG sensor network can be divided into the following two categories: 1. The signal collected by the FBG sensor is lost due to the failure of the FBG sensor communication; The data collected by the sensor has different degrees of spectral distortion, light intensity attenuation, and spectral overlap.

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  • Distributed multi-node cooperative fiber bragg grating sensor fault positioning method
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Embodiment Construction

[0015] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0016] First of all, it is necessary to analyze the theoretical model of the fiber Bragg grating. According to the theoretical analysis, the reflection spectrum of the fiber Bragg grating is a narrow-band spectrum, and the central wavelength of its peak is called the Bragg wavelength λ B . Bragg wavelength λ B Depends on the effective refractive index n of the fiber grating eff and grating period Λ. The Bragg equation gives that when the fiber grating is affected by stress or temperature, the effective refractive index n eff and the grating period Λ will change to varying degrees, thus causing the Bragg wavelength λ B drift. As long as the wavelength shift is measured, the value of the sensing parameter can be indirectly measured. Any such that the effective refractive index n eff The physical process of changing the grating period...

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Abstract

The invention relates to a distributed multi-node cooperative fiber bragg grating sensor fault positioning method. For abnormal state of fault data in the FBG sensor network, a distributed multi-nodeFBG network fault node is accurately positioned in combination with anant colony algorithm and a support vector machine.

Description

technical field [0001] The invention relates to the fields of optical sensing technology, optical fiber Bragg grating, intelligent algorithm application, etc., and in particular to a distributed multi-node cooperative fiber Bragg grating sensor fault location method based on ant colony algorithm and support vector machine. Background technique [0002] With the continuous advancement of industrial intelligence, new sensing technologies play an increasingly important role. Fiber Bragg Grating (FBG) sensor is an important branch of new sensing technology, because it is completely passive and does not use any electronic components, it can work in extreme environments and resist electromagnetic interference. In addition, FBG The sensor also has the advantages of linear sensing of stress and temperature, small size, high sensitivity, corrosion resistance, and reusability. Therefore, FBG sensing technology gradually stands out in new sensing technologies and is widely used. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/079G01D18/00G06N3/00G06N20/10
CPCH04B10/0791G06N20/10G06N3/006G01D18/00
Inventor 江灏王尤刚陈静缪希仁
Owner FUZHOU UNIV
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