A Reflection Ultrasonic Interference Method for Measurement of the Acoustic Velocity of Thin Layers
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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
Ultrasonic waves can be used to measure the velocities and other properties of a material layer by determining the difference in the time-of-flight of the successive echoes from the backwall of the layer. The top and bottom surfaces must be sufficiently far apart for the successive echoes to be distinct. This method can be used to measure the velocity of a protective epoxy layer on a pipeline wall to determine the deviation of an ultrasonic wave scattered from a defect. It has been used to determine the strength of adhesive bonds [1].