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Sensors 2017, 17(9), 1948; doi:10.3390/s17091948

Fibre Bragg Gratings in Embedded Microstructured Optical Fibres Allow Distinguishing between Symmetric and Anti-Symmetric Lamb Waves in Carbon Fibre Reinforced Composites

1
Department of Applied Physics and Photonics (TONA), Vrije Universiteit Brussel, Brussels Photonics (B-PHOT), Pleinlaan 2, 1050 Brussels, Belgium
2
Flanders Make, Oude Diestersebaan 133, 3920 Lommel, Belgium
3
Hellenic Aerospace Industry, Engineering Research Design and Development Directorate, 32009 Shimatari, Greece
*
Author to whom correspondence should be addressed.
Received: 31 July 2017 / Revised: 18 August 2017 / Accepted: 19 August 2017 / Published: 24 August 2017
(This article belongs to the Special Issue Sensor Technologies for Health Monitoring of Composite Structures)
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Abstract

Conventional contact sensors used for Lamb wave-based ultrasonic inspection, such as piezo-electric transducers, measure omnidirectional strain and do not allow distinguishing between fundamental symmetric and anti-symmetric modes. In this paper, we show that the use of a single fibre Bragg grating created in a dedicated microstructured optical fibre allows one to directly make the distinction between these fundamental Lamb wave modes. This feature stems from the different sensitivities of the microstructured fibre to axial and transverse strain. We fabricated carbon fibre-reinforced polymer panels equipped with embedded microstructured optical fibre sensors and experimentally demonstrated the strain waves associated with the propagating Lamb waves in both the axial and transverse directions of the optical fibre. View Full-Text
Keywords: fibre Bragg gratings; Lamb waves; CFRP; impact damages fibre Bragg gratings; Lamb waves; CFRP; impact damages
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De Pauw, B.; Goossens, S.; Geernaert, T.; Habas, D.; Thienpont, H.; Berghmans, F. Fibre Bragg Gratings in Embedded Microstructured Optical Fibres Allow Distinguishing between Symmetric and Anti-Symmetric Lamb Waves in Carbon Fibre Reinforced Composites. Sensors 2017, 17, 1948.

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