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FBG sensor network spectrum demodulation method based on improved simulated annealing method

A technology of simulated annealing method and demodulation method, which is applied in the field of spectral demodulation of FBG sensor network based on improved simulated annealing method, can solve the problems of not considering the overlapping of multiple grating spectra, algorithm defects, etc., to increase the number of demodulation, Overcome the effect of non-overlapping and improve demodulation efficiency

Inactive Publication Date: 2018-07-06
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

However, the above algorithm only realizes the multiplexing demodulation in the case of spectral overlap of two gratings, and does not consider the overlapping of multiple grating spectra, and has corresponding algorithm defects

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  • FBG sensor network spectrum demodulation method based on improved simulated annealing method
  • FBG sensor network spectrum demodulation method based on improved simulated annealing method
  • FBG sensor network spectrum demodulation method based on improved simulated annealing method

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Embodiment

[0042] A method for spectral multiplexing in a distributed FBG sensor network based on improved simulated annealing, in the method, comprising the following steps:

[0043] Step 1: According to the mathematical characteristics of the FBG sensing system, determine its relevant mathematical expressions and establish a reasonable mathematical model to construct the objective function of spectral overlap of the distributed FBG sensing network system.

[0044] Step 2: Combine the particle swarm algorithm and the improved simulated annealing algorithm to solve the constructed objective function; use the particle swarm algorithm to search for the solution of the objective function, which can speed up the convergence speed in the initial stage of operation; use the improved simulated annealing algorithm to avoid the obtained solution Falling into a local optimal solution increases the probability of obtaining an optimal solution; combining the two algorithms makes the new optimization ...

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Abstract

The invention relates to an FBG sensor network spectrum demodulation method based on an improved simulated annealing method. The FBG sensor network spectrum demodulation method comprises the steps of:S1, expressing a mathematical expression of reflection spectra of an entire FBG sensor network according to mathematical characteristics of the FBG sensor network and the measured reflection spectra,reconstructing the mathematical expression of the reflection spectra, and regarding a variance of mathematical expressions of incident spectra and the reflection spectra; S2, adopting a particle swarm algorithm to search for a solution of an objective function, adopting the improved simulated annealing method to perform annealing operation after every particle position update before the optimal solution is obtained, so as to avoid the calculated solution from falling into a locally optimal solution; S3, and regarding the obtained optimal solution as a reflection spectrum central wavelength value of each FBG in the FBG sensor network. Compared with the prior art, the FBG sensor network spectrum demodulation method improves the demodulation efficiency of FBG spectral multiplexing, increasesthe overlapping demodulation number of grating spectra, and overcomes the limitation that wavelength ranges of different gratings cannot overlap.

Description

technical field [0001] The invention relates to a FBG sensor network spectrum demodulation method, in particular to a FBG sensor network spectrum demodulation method based on an improved simulated annealing method. Background technique [0002] Fiber Bragg grating (Fiber Bragg grating, FBG) sensor is a kind of fiber optic passive device, which has the advantages of small size, light weight, anti-electromagnetic interference, corrosion resistance, high temperature resistance, high sensitivity, and easy realization of distributed network multiplexing. It is used in the fields of optical communication and optical sensing. Fiber Bragg grating sensors use the corresponding relationship between the center wavelength offset of the reflection spectrum peak and the physical quantity to be detected to realize the detection of sensing parameters (such as temperature, humidity, strain, etc.). When synchronously detecting multiple variables, it is necessary to form FBG sensors into a mu...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353G06N3/00
CPCG01D5/35316G06N3/006
Inventor 李志斌刘畅黄启韬
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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