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Titolo:
SELF-FOCUSING AND TIME RECOMPRESSION OF LAMB WAVES USING A TIME-REVERSAL MIRROR
Autore:
ING RK; FINK M;
Indirizzi:
UNIV PARIS 07,LAB ONDES & ACOUST,URA CNRS 1503,10 RUE VAUQUELIN F-75231 PARIS 05 FRANCE
Titolo Testata:
Ultrasonics
fascicolo: 1-5, volume: 36, anno: 1998,
pagine: 179 - 186
SICI:
0041-624X(1998)36:1-5<179:SATROL>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Keywords:
LAMB WAVE; NDE; TIME REVERSAL PROCESS; TIME REVERSAL MIRROR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
8
Recensione:
Indirizzi per estratti:
Citazione:
R.K. Ing e M. Fink, "SELF-FOCUSING AND TIME RECOMPRESSION OF LAMB WAVES USING A TIME-REVERSAL MIRROR", Ultrasonics, 36(1-5), 1998, pp. 179-186

Abstract

Lamb waves are particularly useful in the non-destructive testing domain of guided structures. However, they have the drawback to be dispersive and multimodal. These two characteristics make their processing particularly delicate during measurements. With a time reversal mirror (TRM), realized with an array of 32 transducers coupled to a Lucite wedge and where each transducer is associated to an appropriate individual electronic, we demonstrate that the time reversal process allows tocompensate the problems linked to these two characteristics. In the set of experiments presented in this paper, we use a laser impact of short time duration to create a point source of Lamb waves. Using the TRM, detected waves are then remitted, but in time reverse order. According to this re-emission, we obtain an axial hyperfocusing effect whosemaximum is localized at the initial laser generation point. This hyperfocusing effect generated by the time recompression is tested on different plates of various thickness and geometry. Experimental results are then compared to a numerical bidimensional scalar model. (C) 1998 Elsevier Science B.V.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/09/20 alle ore 05:03:02