Lamb waves detection through phi-OTDR for structural health monitoring

Vallifuoco, Raffaele; Cerri, Enis; Minardo, Aldo; Zeni, Luigi; Zahoor, Rizwan; Perfetto, Donato; Caputo, Francesco; Luca, A. De

doi:10.1109/metroaerospace54187.2022.9856164

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2023

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“…They are suitable for long-distance assessment because, depending on their frequency, they can travel for long distances [5]. Our group has already demonstrated the use of phi-OTDR sensors for Lamb wave detection [6,7]. However, because of dispersion and multimode properties of Lamb waves, damage features resulting from their interaction with structural defects are often drowned and undetectable.…”

Section: Introductionmentioning

confidence: 99%

Damage detection in an aluminum plate through a phi-OTDR sensor and support vector machines

Zahoor

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Vallifuoco³

et al. 2023

European Workshop on Optical Fibre Sensors (EWOFS 2023)

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In this paper, we make use of a phase-sensitive time domain reflectometry (phi-OTDR) sensor with 60-cm spatial resolution to detect the Lamb waves generated by a piezo-ceramic actuator in an aluminum plate. Furthermore, a machine learning algorithm based on Support Vector Machine (SVM) classifiers was employed for damage localization. We show that SVMs are able to identify the characteristics in Lamb wave signals that may be linked to damage location. This study makes full use of the rich information provided by the phi-OTDR sensor, extracting damaged data from diverse damage spots. The results indicate that the proposed technique has the potential to identify and locate damages in thin-plate structures.

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Section: Introductionmentioning

confidence: 99%