Ultrasonic Equivalent Flaw Sizing - A Time-of-Flight Approach
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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 equivalent flaw sizing is a method in which the size, shape, and orientation of a flaw is determined in terms of a best-fit simple shape, such as an ellipsoid (for volumetric flaws) or an ellipse (for cracks). Previous equivalent flaw sizing methods have used the Born [1] or Kirchhoff [2] approximations in conjunction with non-linear optimization procedures. More recently, Chiou and Schmerr [3] have shown how the non-linear optimization problem in equivalent sizing can be reduced to a simpler linear least squares/eigenvalue problem.