Time of flight diffraction method using laser ultrasound for noncontact flaw height measurement

T. Mihara, Y. Otsuka, H. Cho, K. Yamanaka

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)


We developed a laser TOFD (Time of flight diffraction) algorithm which utilizes not only longitudinal wave but also shear wave. This algorithm made it possible to obtain accurate flaw depth without knowing the specimen velocity and probe distance previously. We constructed the laser TOFD system and applied it to estimate the slit depth of aluminum alloy plate. Time of flight of lateral wave, flaw tip diffraction waves and mode converted shear wave at flaw tip were used to estimate the slit depth using new algorithm.

Original languageEnglish
Pages (from-to)987-992
Number of pages6
JournalKey Engineering Materials
Issue numberII
Publication statusPublished - 2004 Jan 1
EventAdvances in Fracture and Failure Prevention: Proceedings of the Fifth International Conference on Fracture and Strength of Solids (FEOFS2003): Second International Conference on Physics and Chemistry of Fracture and Failure Prevention (2nd ICPCF) - Sendai, Japan
Duration: 2003 Oct 202003 Oct 22


  • Directivity
  • Flaw sizing
  • Laser ultrasound
  • Longitudinal wave
  • Mode conversion
  • Nondestructive evaluation
  • TOFD
  • Ultrasonics

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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