Self-Calibrating Ultrasonic Technique for R/T and T/R Measurements
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Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.
This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.
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Abstract
When a surface containing a surface-breaking crack is directly accessible for the generation of ultrasound, the use of surface waves is a preferred technique for depth determination of the crack. In principle, the crack depth can be determined by an accurate measurement at a fixed frequency or over a range of frequencies of either or both the reflection, R, and transmission, T, coefficients, and by subsequent comparison of these measurements with theoretical results for R and/or T as functions of crack depth.