Relationship of Gaussian Beam Theory to Scanned Ultrasonic Measurements with Commercial Transducers
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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
The effects of diffraction play an important role in defining the performance of an ultrasonic inspection. For example, in a scanned inspection with a focussed probe, diffraction determines the size of the beam near the focal point. This in turn defines the size of the scan increments which will produce a desired probability of detecting a flaw. Increments which are too great will introduce a greater possibility of missing a flaw. Those which are too small will cause excess time and inspection cost.