Noncontact ultrasonic imaging of subsurface defects using a laser-ultrasonic technique

Hisashi Yamawaki, Tetsuya Saito, Hiroaki Fukuhara, Chitoshi Masuda, Yoshihisa Tanaka

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)3075-3079
Number of pages5
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume35
Issue number5 B
Publication statusPublished - 1996
Externally publishedYes

Keywords

  • Heterodyne interferometer
  • Laser-ultrasonic
  • Microscopic ultrasonic imaging
  • Noncontact ultrasonic measurement
  • Nondestructive testing
  • Subsurface defects

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Engineering(all)

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