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Proceedings Paper

Measurement of the mechanical amplitude and phase of transient surface acoustic waves using double-pulsed TV holography and the spatial Fourier transform method
Author(s): Cristina Trillo; Angel F. Doval; Daniel Cernadas; Oscar Lopez; Carlos Lopez; Benito Vasquez Dorrio; Jose L. Fernandez; Mariano Perez-Amor
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Paper Abstract

We present a technique to calculate the mechanical amplitude and phase of an ultrasonic plane wavefield of nanometric amplitude that propagates on a surface. Our aim is to detect perturbations of the initially smooth wavefronts that indicate the presence of flaws in the material. We use bursts of Rayleigh waves and a double-pulsed TV Holography system that records two correlograms separated down to 1.5 microseconds. The phases of the correlograms are calculated separately using the spatial Fourier transform method (SFTM), and subtracted. In the resultant phase map, the field of instantaneous displacements of the surface (that comprises several periods of the surface acoustic wave) acts as a modulated spatial carrier, now related to the mechanical phase and amplitude, that are extracted applying the SFTM again.

Paper Details

Date Published: 27 May 2003
PDF: 6 pages
Proc. SPIE 4933, Speckle Metrology 2003, (27 May 2003); doi: 10.1117/12.516578
Show Author Affiliations
Cristina Trillo, Univ. de Vigo (Spain)
Angel F. Doval, Univ. de Vigo (Spain)
Daniel Cernadas, Univ. de Vigo (Spain)
Oscar Lopez, Univ. de Vigo (Spain)
Carlos Lopez, Univ de Vigo (Spain)
Benito Vasquez Dorrio, Univ. de Vigo (Spain)
Jose L. Fernandez, Univ. de Vigo (Spain)
Mariano Perez-Amor, Univ. de Vigo (Spain)

Published in SPIE Proceedings Vol. 4933:
Speckle Metrology 2003
Kay Gastinger; Ole Johan Lokberg; Svein Winther, Editor(s)

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