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Proceedings Paper

Nondestructive testing technique combining ultrasonic Lamb waves and double-pulse TV holography
Author(s): Daniel Cernadas; C. Trillo; Angel F. Doval; Carlos Lopez; Benito Vasquez Dorrio; J. L. Fernandez; Mariano Perez-Amor
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Paper Abstract

The combination of ultrasonics with optics has led to the development of emergent technologies for nondestructive testing with outstanding capabilities. In this work we describe a combination that, in our knowledge, was up to now unexplored, directed to the detection of cracks and other types of flaws in metallic plates of medium thickness (several millimeters). We selected a special kind of surface acoustic waves, i.e. Lamb waves, to explore the volume of the plates in the search for flaws, while a whole field interferometric technique, namely double-pulse TV holography, is employed to generate a map of the surface displacements in which the signature of the defects can be seen as a perturbation of the initially smooth wavefronts. Several examples of detection of artificially generated flaws are presented.

Paper Details

Date Published: 22 May 2002
PDF: 11 pages
Proc. SPIE 4827, Fifth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (22 May 2002); doi: 10.1117/12.468155
Show Author Affiliations
Daniel Cernadas, Univ. de Vigo (Spain)
C. Trillo, Univ. de Vigo (Spain)
Angel F. Doval, Univ. de Vigo (Spain)
Carlos Lopez, Univ. de Vigo (Spain)
Benito Vasquez Dorrio, Univ. de Vigo (Spain)
J. L. Fernandez, Univ. de Vigo (Spain)
Mariano Perez-Amor, Univ. de Vigo (Spain)


Published in SPIE Proceedings Vol. 4827:
Fifth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications
Enrico Primo Tomasini, Editor(s)

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