Title :
Local and selective detection of acoustic waves at the surface of a material
Author :
Nikolovski, J.P. ; Royer, D.
Author_Institution :
Lab. Ondes et Acoust., Paris VII Univ., France
Abstract :
A method for detecting selectively elastic waves at the surface of a solid is described. This method is based on the propagation of transversal waves in a tapered rod. The probe is composed of a shear wave transducer coupled to a focusing tip. Selective detection of acoustic waves at the surface of materials is experimentally demonstrated. Conical and parabolic tips are compared. The sensitivity of the probe as well as the local perturbation induced by the contact is investigated with an optical heterodyne interferometer
Keywords :
piezoelectric transducers; surface acoustic wave transducers; surface acoustic waves; ultrasonic materials testing; ultrasonic transducers; Lamb mode; US testing; acoustic waves; angular characteristics; conical tips; elastic waves; focusing tip; local detection; local perturbation; material surface; mode conversion; optical heterodyne interferometer; parabolic tips; piezoelectric transducer; probe sensitivity; propagation of transversal waves; selective detection; shear wave transducer; tapered rod; Acoustic propagation; Acoustic signal detection; Acoustic transducers; Acoustic waves; Optical interferometry; Optical materials; Optical surface waves; Probes; Solids; Surface acoustic waves;
Conference_Titel :
Ultrasonics Symposium, 1997. Proceedings., 1997 IEEE
Conference_Location :
Toronto, Ont.
Print_ISBN :
0-7803-4153-8
DOI :
10.1109/ULTSYM.1997.663114
