Strain monitoring using distributed fiber optic sensors embedded in carbon fiber composites

Sasi Jothibasu; Yang Du; Sudharshan Anandan; Gurjot S. Dhaliwal; Amardeep Kaur; Steve E. Watkins; K. Chandrashekhara; Jie Huang

doi:10.1117/12.2296636

27 March 2018 Strain monitoring using distributed fiber optic sensors embedded in carbon fiber composites

Sasi Jothibasu, Yang Du, Sudharshan Anandan, Gurjot S. Dhaliwal, Amardeep Kaur, Steve E. Watkins, K. Chandrashekhara, Jie Huang

Author Affiliations +

Proceedings Volume 10598, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2018; 105980I (2018) https://doi.org/10.1117/12.2296636
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2018, Denver, Colorado, United States

Abstract

A distributed fiber optic strain sensor based on Rayleigh backscattering, embedded in a fiber-reinforced polymer composite, has been demonstrated. The optical frequency domain reflectometry (OFDR) technique was used to analyze the backscattered signal. The shift in the Rayleigh backscattered spectrum (RBS) was observed to be linear to the change in strain of the composite material. The sensor (standard single-mode fiber) was embedded between the layers of the composite laminate. A series of tensile loads were applied to the laminate using an Instron testing machine, and the corresponding strain distribution of the laminate was measured. The results show a linear response indicating a seamless integration of the optic fiber in the composite material and a good correlation with the electrical-resistance strain gauge results. In this study, distributed strain measurements in a composite laminate were successfully obtained using an embedded fiber optic sensor.

Citation Download Citation

Sasi Jothibasu, Yang Du, Sudharshan Anandan, Gurjot S. Dhaliwal, Amardeep Kaur, Steve E. Watkins, K. Chandrashekhara, and Jie Huang "Strain monitoring using distributed fiber optic sensors embedded in carbon fiber composites", Proc. SPIE 10598, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2018, 105980I (27 March 2018); https://doi.org/10.1117/12.2296636

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