Pump-probe localization technique of varying solid contacts

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 backpropagati...

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2021-05, Vol.149 (5), p.2943-2949
Main Authors: Terzi, M., Chehami, L., Farin, M., Moulin, E., Aleshin, V., Smagin, N., de Rosny, J., Benmeddour, F.
Format: Article
Language:English
Subjects:
Acoustics
Computer Science
Engineering Sciences
Mechanics
Physics
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Summary: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.
ISSN:0001-4966
1520-8524
DOI:10.1121/10.0004820