Title :
Excitation of the creeping wave by phase velocity scanning of laser interference fringe
Author :
Tsukahara, Y. ; Nishino, H. ; Sato, H. ; Yamanaka, K.
Author_Institution :
Toppan Tech. Res. Inst., Saitama, Japan
Abstract :
In non-destructive evaluation, attention has been paid to the “creeping wave”. The creeping wave can be understood as a longitudinal head wave associated with a transverse wave radiating into a solid which is in contact with a vacuum at a flat interface. The present paper demonstrates a first measurement of 80 MHz creeping waves excited by the scanning interference fringe of the laser irradiation on the free solid surface of sintered silicon nitride, Si3N4
Keywords :
ceramics; creep; laser beam effects; measurement by laser beam; silicon compounds; sintering; ultrasonic materials testing; wave propagation; 80 MHz; Si3N4; creeping wave excitation; flat interface contact; free solid surface; laser interference fringe phase velocity scanning; laser irradiation; laser ultrasonic experiment; nondestructive evaluation; sintered Si3N4; transverse wave radiation; vacuum conditions; Interference; Laser beams; Laser excitation; Optical materials; Optical surface waves; Solids; Surface acoustic waves; Surface cracks; Surface emitting lasers; Surface waves;
Conference_Titel :
Ultrasonics Symposium, 1996. Proceedings., 1996 IEEE
Conference_Location :
San Antonio, TX
Print_ISBN :
0-7803-3615-1
DOI :
10.1109/ULTSYM.1996.584130
