Journal of Nondestructive Evaluation

, Volume 11, Issue 2, pp 103–108 | Cite as

Self-calibrating ultrasonic technique for crack depth measurement

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


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/orT/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 onT/R for the latter case can be used to determine the depth of the crack. The experimental measurements ofT/R show excellent agreement with theoretical results.

Key words

Ultrasonics surface breaking cracks self-calibrating crack depths 


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Copyright information

© Plenum Publishing Corporation 1992

Authors and Affiliations

  • J. D. Achenbach
    • 1
  • I. N. Komsky
    • 1
  • Y. C. Lee
    • 1
  • Y. C. Angel
    • 2
  1. 1.Center for Quality Engineering and Failure PreventionNorthwestern UniversityEvanston
  2. 2.Department of Mechanical Engineering and Materials ScienceRice UniversityHouston

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