TY - JOUR
T1 - Noncontact ultrasonic imaging of subsurface defects using a laser-ultrasonic technique
AU - Yamawaki, Hisashi
AU - Saito, Tetsuya
AU - Fukuhara, Hiroaki
AU - Masuda, Chitoshi
AU - Tanaka, Yoshihisa
PY - 1996
Y1 - 1996
N2 - Noncontact ultrasonic imaging of subsurface defects using a laser-ultrasonic technique was demonstrated. Pulsed laser irradiation was used for ultrasonic generation, and optical heterodyne interferometry was used for detection of ultrasonic vibration on the specimen surface. Bonded thin plates with character-shaped hallmarks with 1.5mm width on bonding layer were used as specimens. Imagings in ultrasonic transmission and reflection modes were performed, and imagings using not only XY-scanning of specimens but also a laser beam scanner were demonstrated. Ultrasonic images of hallmarks located 0.2mm below the specimen surface were obtained through the experiments.
AB - Noncontact ultrasonic imaging of subsurface defects using a laser-ultrasonic technique was demonstrated. Pulsed laser irradiation was used for ultrasonic generation, and optical heterodyne interferometry was used for detection of ultrasonic vibration on the specimen surface. Bonded thin plates with character-shaped hallmarks with 1.5mm width on bonding layer were used as specimens. Imagings in ultrasonic transmission and reflection modes were performed, and imagings using not only XY-scanning of specimens but also a laser beam scanner were demonstrated. Ultrasonic images of hallmarks located 0.2mm below the specimen surface were obtained through the experiments.
KW - Heterodyne interferometer
KW - Laser-ultrasonic
KW - Microscopic ultrasonic imaging
KW - Noncontact ultrasonic measurement
KW - Nondestructive testing
KW - Subsurface defects
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M3 - Article
AN - SCOPUS:0030149321
SN - 0021-4922
VL - 35
SP - 3075
EP - 3079
JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
IS - 5 B
ER -