Self-calibrating ultrasonic technique for crack depth measurement

J. D. Achenbach, I. N. Komsky, Y. C. Lee, Y. C. Angel

Research output: Contribution to journalArticlepeer-review

68 Citations (Scopus)


A configuration of transducers together with a self-calibrating measurement technique is proposed to investigate the reflection and transmission of surface waves by a surface-breaking or near surface defect. By means of this technique, the ratio of the reflection and transmission coefficients (R/T and/or T/R) can be obtained in a reliable and accurate manner. The reflection and transmission of surface waves for oblique incidence on a surface breaking crack is investigated in detail. Information on T/R for the latter case can be used to determine the depth of the crack. The experimental measurements of T/R show excellent agreement with theoretical results.

Original languageEnglish
Pages (from-to)103-108
Number of pages6
JournalJournal of Nondestructive Evaluation
Issue number2
Publication statusPublished - 1992 Jun

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering


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