TITLE

Analysis of surface acoustic wave propagation on a cylinder using laser ultrasonics

AUTHOR(S)
Clorennec, D.; Royer, D.
PUB. DATE
June 2003
SOURCE
Applied Physics Letters;6/23/2003, Vol. 82 Issue 25, p4608
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
This letter shows an unexpected phenomenon for surface acoustic waves (Rayleigh waves) propagating on a solid cylinder. It was observed that a short Rayleigh wave pulse was reversed during its propagation. In experiments on duraluminum and steel cylinders, transient surface acoustic waves were launched by a pulsed YAG laser focused along a line. The radial component of the displacement was measured by a heterodyne optical interferometer. The wave forms recorded versus the angle θ between the source and the detection point shows that the Rayleigh pulse, which is monopolar (positive) near the source, becomes bipolar at θ = 45° and monopolar (negative) at θ = 90°. An analytical calculation taking into account the dispersive effect reproduces wave forms whatever the propagation distance. A physical model is proposed to account for the reversal of the acoustic pulse.
ACCESSION #
10024391

 

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