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Article Dans Une Revue Journal of the Acoustical Society of America Année : 2021

Pump-probe localization technique of varying solid contacts

Maxime Farin
Julien de Rosny

Résumé

A baseline-free defect localization method in thin plates is proposed and tested. In this proof-of-concept work, a steel ball pressed against an aluminum plate is used to mimic a surface contact defect. The technique takes benefit of a repetitive nonlinear pump-probe interaction with a backpropagation imaging algorithm. High-frequency probe waves are periodically emitted by a piezoelectric patch transducer glued to the plate. Propagated flexural waves are recorded using a distributed array of transducers. At the same time, a continuous low-frequency pump vibration provided by a shaker fixed to the plate modulates the contact state. By combining multiple probe signals, the contact can be successfully localized. Contrast of the localization images is finally improved by a factor of 3 to 5 by implementing a modified version based on synchronous detection of the imaging algorithm.
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Dates et versions

hal-03376735 , version 1 (21-10-2021)

Identifiants

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Marina Terzi, Lynda Chehami, Maxime Farin, Emmanuel Moulin, Vladislav Aleshin, et al.. Pump-probe localization technique of varying solid contacts. Journal of the Acoustical Society of America, 2021, 149 (5), pp.2943-2949. ⟨10.1121/10.0004820⟩. ⟨hal-03376735⟩
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