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Sensors 2019, 19(6), 1375; https://doi.org/10.3390/s19061375

Bidirectional, Bimodal Ultrasonic Lamb Wave Sensing in a Composite Plate Using a Polarization-Maintaining Fiber Bragg Grating

1
Department of Physics, University of Alabama in Huntsville, Huntsville, AL 35899, USA
2
College of Physics and Communication Electronics, Jiangxi Normal University, Nanchang 330022, Jiangxi, China
*
Author to whom correspondence should be addressed.
Received: 30 January 2019 / Revised: 15 March 2019 / Accepted: 17 March 2019 / Published: 19 March 2019
(This article belongs to the Special Issue Ultrasound Transducers)
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Abstract

Lamb wave (LW) is well suited for structural health monitoring (SHM) in advanced composites. However, characteristic differences between the symmetric modes and the anti-symmetric modes often add complexity to SHM systems. The anisotropic nature of composite materials, on the other hand, necessitates direction-sensitive sensing. In this paper we report the experimental demonstration of bidirectional (0° and 90°), bimodal (S0 and A0) LW measurement within the frequency range of 20–140 kHz using a polarization-maintaining fiber Bragg grating (PM-FBG) sensor attached to a composite laminated plate. By selectively interrogating the fast and/or the slow axis of the PM-FBG, we show that not only can the sensor respond to LWs propagating along both directions, but the response can also be used to differentiate the two directions. Moreover, the fast axis of the sensor is able to respond to both the S0 and the A0 modes when the sensor is aligned with the wave propagation direction, whereas single S0 mode response can be achieved with the slow axis operating perpendicularly to the wave propagation direction. Such diverse responses indicate the potential of PM-FBGs as versatile multi-parameter SHM detectors, which can effectively address the challenges posed by material anisotropicity and LW mode diversity. View Full-Text
Keywords: polarization-maintaining Fiber Bragg Grating sensor; Lamb waves; single-mode responses; composite plate polarization-maintaining Fiber Bragg Grating sensor; Lamb waves; single-mode responses; composite plate
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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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Rao, C.; Duan, L. Bidirectional, Bimodal Ultrasonic Lamb Wave Sensing in a Composite Plate Using a Polarization-Maintaining Fiber Bragg Grating. Sensors 2019, 19, 1375.

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