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Proceedings Paper

Ultrasonic nondestructive testing with time reversal mirrors
Author(s): N. Chakroun; Mathias Fink; Fengqing Wu
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Paper Abstract

Detection of very small defects in solids needs the development of new focusing techniques. Focusing an ultrasonic wave on a defect of unknown shape through an interface of any geometrical shape is an important problem to be solved in acoustics, and is a challenge in nondestructive testing. In nondestructive testing, we have to detect metallurgical defects and the incident beam can be strongly distorted with the change of acoustical impedance created at the liquid-solid interfaces. The use of time reversal mirror (TRM) represents an original solution to this problem. They realize in real time a focusing process matched to the defect shape, to the propagation medium, and to the geometries of the mirror and of the medium. It is a self-adaptive technique which compensates for any geometrical distortions of the mirror structure as well as for distortions due to the propagation through interfaces between liquid and solid.

Paper Details

Date Published: 5 November 1992
PDF: 9 pages
Proc. SPIE 1733, New Developments in Ultrasonic Transducers and Transducer Systems, (5 November 1992); doi: 10.1117/12.130611
Show Author Affiliations
N. Chakroun, Univ. de Paris VII (France)
Mathias Fink, Univ. de Paris VII (France)
Fengqing Wu, Univ. de Paris VII (France)

Published in SPIE Proceedings Vol. 1733:
New Developments in Ultrasonic Transducers and Transducer Systems
Frederick L. Lizzi, Editor(s)

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