Titre :

Time reversed acoustics techniques for elastic imaging in reverberant and nonreverberant media : an experimental study of the chaotic cavity transducer concept

Auteur(s) :

van Damme, B. [Auteur]
Catholic University of Leuven = Katholieke Universiteit Leuven [KU Leuven]
van den Abeele, K. [Auteur]
Catholic University of Leuven = Katholieke Universiteit Leuven [KU Leuven]
Li, Y.F. [Auteur]
Nanjing Tech University
Bou Matar Lacaze, Olivier [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]

Titre de la revue :

Journal of Applied Physics

Pagination :

104910

Éditeur :

American Institute of Physics

Date de publication :

2011

ISSN :

0021-8979

Discipline(s) HAL :

Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph]

Résumé en anglais : [en]

In view of emerging imaging technologies based on the combination of Time Reversed Acoustics (TRA) with Nonlinear Elastic Wave Spectroscopy (NEWS) for the detection and localization of micro-damage in solids, we have ...
Lire la suite >In view of emerging imaging technologies based on the combination of Time Reversed Acoustics (TRA) with Nonlinear Elastic Wave Spectroscopy (NEWS) for the detection and localization of micro-damage in solids, we have investigated the benefits of chirped source signal excitation, inverse filtering techniques, and the implementation of chaotic cavity transducers to improve the quality of energy focusing, especially for weakly reverberant media. Chaotic cavity transducer focusing is defined as the hardware-software combination of a piezoelectric ceramic glued on a cavity of chaotic shape on the one hand with the reciprocal Time Reversal (or Inverse Filter) technique on the other hand. Experimental data for reverberant and nonreverberant composite plates show that the use of chirps, inverse filtering and chaotic cavity transducers significantly enhances the focusing process, and enables focusing in a nonreverberant medium using only one transducer. As a potential exploitation, the application of the chaotic cavity transducer concept for synthetic imaging is examined, revealing several properties similar to phased arraysLire moins >

Langue :

Anglais

Vulgarisation :

Non

Collections :

• Institut d'Électronique, de Microélectronique et de Nanotechnologie (IEMN) - UMR 8520

Source :

Harvested from HAL