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.
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Achenbach, J.D., Komsky, I.N., Lee, Y.C. et al. Self-calibrating ultrasonic technique for crack depth measurement. J Nondestruct Eval 11, 103–108 (1992). https://doi.org/10.1007/BF00568293
- surface breaking cracks
- crack depths