Please use this identifier to cite or link to this item:
Title: Embedded fibre Bragg grating sensors for non-uniform strain sensing in composite structures
Authors: Ling, HY
Lau, KT 
Cheng, L 
Chow, KW
Keywords: Fibre Bragg grating (FBG) sensors
Non-uniform strain
Strain measurement
Transfer matrix
Issue Date: 2005
Publisher: Institute of Physics Publishing
Source: Measurement science and technology, 2005, v. 16, no. 12, p. 2415-2424 How to cite?
Journal: Measurement science and technology 
Abstract: A methodology for evaluating the response of embedded fibre Bragg grating (FBG) sensors in composite structures based on the strain in a host material is introduced. In applications of embedded FBG sensors as strain sensing devices, it is generally assumed that the strain experienced in a fibre core is the same as the one measured in the host material. The FBG sensor is usually calibrated by a strain gauge through a tensile test, centred on obtaining the relationship between the surface strain in the host material and the corresponding Bragg wavelength shift obtained from the FBG sensor. However, such a calibration result can only be valid for uniform strain measurement. When the strain distribution along a grating is non-uniform, average strain measured by the strain gauge cannot truly reflect the in-fibre strain of the FBG sensor. Indeed, the peak in the reflection spectrum becomes broad, may even split into multiple peaks, in sharp contrast with a single sharp peak found in the case of the uniform strain measurement. In this paper, a strain transfer mechanism of optical fibre embedded composite structure is employed to estimate the non-uniform strain distribution in the fibre core. This in-fibre strain distribution is then utilized to simulate the response of the FBG sensor based on a transfer-matrix formulation. Validation of the proposed method is preceded by comparing the reflection spectra obtained from the simulations with those obtained from experiments.
ISSN: 0957-0233
EISSN: 1361-6501
DOI: 10.1088/0957-0233/16/12/003
Appears in Collections:Journal/Magazine Article

View full-text via PolyU eLinks SFX Query
Show full item record


Last Week
Last month
Citations as of Aug 6, 2018


Last Week
Last month
Citations as of Aug 14, 2018

Page view(s)

Last Week
Last month
Citations as of Aug 19, 2018

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.