Title :
Shear-wave focusing and beam steering by a thermoelastic source array: application to nondestructive testing
Author :
Noroy, Marie-Hélène ; Royer, Daniel ; Fink, Mathias
fDate :
Oct. 31 1994-Nov. 3 1994
Abstract :
A phased array of 16 thermoelastic line sources has been implemented to focus shear-waves by time delaying the laser generated ultrasound pulses. The focusing parameters have been optimized by computations. Directivity patterns of the array have been probed on a duraluminum sample by using a piezoelectric transducer. The shear-beam characteristics versus the focusing direction are discussed. Two applications of nondestructive testing are presented. A hole is detected by a transducer by scanning a duraluminum sample with the narrow shear-beam. The same kind of defect is located by an optical probe by analysing the transmitted shear-beam diffracted by the hole
Keywords :
acoustic focusing; piezoelectric transducers; thermoelasticity; ultrasonic focusing; ultrasonic materials testing; ultrasonic waves; beam steering; directivity patterns; duraluminum sample; focusing direction; focusing parameters; laser generated ultrasound pulses; narrow shear-beam; nondestructive testing; optical probe; piezoelectric transducer; shear-wave focusing; thermoelastic line sources; thermoelastic source array; transmitted shear-beam; Acoustic beam focusing; Acoustic beam steering; Acoustic testing; Acoustooptic measurements; Nondestructive testing; Piezoelectric transducers; Thermoelasticity;
Conference_Titel :
Ultrasonics Symposium, 1994. Proceedings., 1994 IEEE
Conference_Location :
Cannes, France
Print_ISBN :
0-7803-2012-3
DOI :
10.1109/ULTSYM.1994.401800
