Title :
Noncontacting optical generation of focused surface acoustic waves using a customised zoneplate
Author :
Liu, M. ; Ho, H.P. ; Somekh, M.G. ; Weaver, J.M.R.
Author_Institution :
Dept. of Electr. & Electron. Eng., Nottingham Univ., UK
fDate :
2/16/1995 12:00:00 AM
Abstract :
The use of computer generated holographic zoneplates to enhance the generation of laser ultrasound is described. An amplitude grating capable of focusing laser light onto an arc which in turn generates a near diffraction limited focus of 82 MHz Rayleigh surface waves is also described. The application of zoneplates for ultrasonic nondestructive evaluation and imaging is considered
Keywords :
Rayleigh waves; acoustic wave production; laser beam applications; surface acoustic wave devices; ultrasonic focusing; ultrasonic imaging; ultrasonic materials testing; zone plates; 82 MHz; Rayleigh surface waves; US imaging; amplitude grating; computer generated holographic zoneplates; customised zoneplate; focused surface acoustic waves; laser ultrasound generation; near diffraction limited focus; noncontacting optical generation; ultrasonic nondestructive evaluation;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19950216
