On the improvement of strain measurements with FBG sensors embedded in unidirectional composites

G. Pereira; C. Frias; H. Faria; O. Frazão; A. T. Marques

doi:10.1016/j.polymertesting.2012.09.010

On the improvement of strain measurements with FBG sensors embedded in unidirectional composites

G. Pereira, C. Frias, H. Faria, O. Frazão, A. T. Marques

Research output: Contribution to journal › Article › peer-review

Abstract

Optical fibre Bragg grating (FBG) sensors are now quite established and widely used in strain measurements of composites. However, insufficient understanding of the limitations of the embedment and measuring techniques often lead to inaccurate and inconclusive results. In this study, a novel method to improve the reliability and accuracy of the strain measurements on unidirectional composites using embedded FBG sensors was successfully developed. Using a carbon/epoxy prepreg system, test specimens were manufactured with longitudinally embedded FBG sensors. The combined behaviour of the sensors and the host material was characterized and a calibration rule (correction factor) was determined for the chosen material. The consistency of the results with both theoretical and empirical assumptions suggests that the proposed method is applicable to a wide range of FBG sensors and host materials. © 2012 Elsevier Ltd. All rights reserved.

Original language	English
Pages (from-to)	99-105
Number of pages	6
Journal	Polymer Testing
Volume	32
Issue number	1
DOIs	https://doi.org/10.1016/j.polymertesting.2012.09.010
Publication status	Published - 2013

Keywords

Non-destructive testing
Optical fibre Bragg Grating sensors
Smart materials
Structural health monitoring

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10.1016/j.polymertesting.2012.09.010

http://www.sciencedirect.com/science/article/pii/S0142941812001894

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title = "On the improvement of strain measurements with FBG sensors embedded in unidirectional composites",

abstract = "Optical fibre Bragg grating (FBG) sensors are now quite established and widely used in strain measurements of composites. However, insufficient understanding of the limitations of the embedment and measuring techniques often lead to inaccurate and inconclusive results. In this study, a novel method to improve the reliability and accuracy of the strain measurements on unidirectional composites using embedded FBG sensors was successfully developed. Using a carbon/epoxy prepreg system, test specimens were manufactured with longitudinally embedded FBG sensors. The combined behaviour of the sensors and the host material was characterized and a calibration rule (correction factor) was determined for the chosen material. The consistency of the results with both theoretical and empirical assumptions suggests that the proposed method is applicable to a wide range of FBG sensors and host materials. {\textcopyright} 2012 Elsevier Ltd. All rights reserved.",

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AU - Pereira, G.

AU - Frias, C.

AU - Faria, H.

AU - Frazão, O.

AU - Marques, A. T.

PY - 2013

Y1 - 2013

N2 - Optical fibre Bragg grating (FBG) sensors are now quite established and widely used in strain measurements of composites. However, insufficient understanding of the limitations of the embedment and measuring techniques often lead to inaccurate and inconclusive results. In this study, a novel method to improve the reliability and accuracy of the strain measurements on unidirectional composites using embedded FBG sensors was successfully developed. Using a carbon/epoxy prepreg system, test specimens were manufactured with longitudinally embedded FBG sensors. The combined behaviour of the sensors and the host material was characterized and a calibration rule (correction factor) was determined for the chosen material. The consistency of the results with both theoretical and empirical assumptions suggests that the proposed method is applicable to a wide range of FBG sensors and host materials. © 2012 Elsevier Ltd. All rights reserved.

AB - Optical fibre Bragg grating (FBG) sensors are now quite established and widely used in strain measurements of composites. However, insufficient understanding of the limitations of the embedment and measuring techniques often lead to inaccurate and inconclusive results. In this study, a novel method to improve the reliability and accuracy of the strain measurements on unidirectional composites using embedded FBG sensors was successfully developed. Using a carbon/epoxy prepreg system, test specimens were manufactured with longitudinally embedded FBG sensors. The combined behaviour of the sensors and the host material was characterized and a calibration rule (correction factor) was determined for the chosen material. The consistency of the results with both theoretical and empirical assumptions suggests that the proposed method is applicable to a wide range of FBG sensors and host materials. © 2012 Elsevier Ltd. All rights reserved.

KW - Non-destructive testing

KW - Optical fibre Bragg Grating sensors

KW - Smart materials

KW - Structural health monitoring

U2 - 10.1016/j.polymertesting.2012.09.010

DO - 10.1016/j.polymertesting.2012.09.010

M3 - Article

SN - 0142-9418

VL - 32

SP - 99

EP - 105

JO - Polymer Testing

JF - Polymer Testing

IS - 1

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On the improvement of strain measurements with FBG sensors embedded in unidirectional composites

Abstract

Keywords

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