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Strain Transfer Analysis of a Clamped Fiber Bragg Grating Sensor

School of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168, China
Centre for Infrastructural Monitoring and Protection, School of Civil and Mechanical Engineering, Curtin University, Kent Street, Bentley WA 6102, Australia
School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China
Author to whom correspondence should be addressed.
Academic Editors: Gangbing Song and Tribikram Kundu
Appl. Sci. 2017, 7(2), 188;
Received: 25 November 2016 / Revised: 24 January 2017 / Accepted: 10 February 2017 / Published: 15 February 2017
(This article belongs to the Special Issue Structural Health Monitoring (SHM) of Civil Structures)
PDF [1821 KB, uploaded 18 February 2017]


Clamped fiber Bragg grating (FBG) sensors have been widely applied in engineering strain measurements due to their advantages of high flexibility and efficiency. However, due to the existence of the interlayer, the strain measured by the encapsulated FBG sensor is not equal to the strain of the host material, which causes strain measurement errors. In this paper, the strain transfer analysis of a clamped FBG sensor based on the shear-lag theory is conducted to improve the accuracy of strain measurements. A novel theoretical model for the axial strain distribution of a clamped FBG sensor is proposed. It is also discussed how the gauge ratio and interlayer thickness affect the strain transfer rate. The accuracy of the proposed theoretical model is verified by experimental tensile tests. The theoretical value of the strain transfer rate matches well with the tested value. View Full-Text
Keywords: strain transfer analysis; clamped fiber Bragg grating (FBG) sensor; shear-lag theory; gauge ratio; interlayer thickness strain transfer analysis; clamped fiber Bragg grating (FBG) sensor; shear-lag theory; gauge ratio; interlayer thickness

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Sun, L.; Li, C.; Li, J.; Zhang, C.; Ding, X. Strain Transfer Analysis of a Clamped Fiber Bragg Grating Sensor. Appl. Sci. 2017, 7, 188.

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