Title :
Laser generated flexural acoustic waves travelling along the tip of a wedge
Author :
Jia, Xiuping ; Auribault, D. ; de Billy, M. ; Quentin, G.
Author_Institution :
Groupe de Phys. des Solides, Paris VII Univ.
fDate :
31 Oct-3 Nov 1993
Abstract :
Surface acoustic waves travelling along the tip of an elastic wedge, are investigated by laser ultrasonic techniques. The laser-generated antisymmetrical flexural (ASF) modes have been detected by laser interferometer on the duralumin wedges of different apex angles. Important dispersion behavior of the waveforms, not predicted by theoretical models, was observed both in the fundamental and superior ASF modes. Dispersion curves of phase velocity were deduced with a phase analysis method. The influence of the apex truncation on the wave dispersion is studied. A comparison is made between ASF modes and the flexural Lamb wave (A0) propagating along the edge of a plate
Keywords :
aluminium alloys; measurement by laser beam; photoacoustic effect; surface acoustic waves; ultrasonic dispersion; apex truncation; dispersion curves; duralumin wedges; elastic wedge tip; flexural Lamb wave propagation; laser generated flexural acoustic waves; laser ultrasonic techniques; laser-generated antisymmetrical flexural modes; wave dispersion; Acoustic signal detection; Acoustic waves; Laser ablation; Laser modes; Laser theory; Optical interferometry; Optical surface waves; Surface acoustic waves; Surface emitting lasers; Ultrasonic imaging;
Conference_Titel :
Ultrasonics Symposium, 1993. Proceedings., IEEE 1993
Conference_Location :
Baltimore, MD
Print_ISBN :
0-7803-2012-3
DOI :
10.1109/ULTSYM.1993.339520
