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Proceedings Paper

Wavelet inversions of elastic wave data for nondestructive evaluation
Author(s): David Matthew Patterson; Brian DeFacio
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Paper Abstract

Certain wavelet transforms based on orthogonal wavelets are used to reduce the noise and then to invert noisy, bandlimited elastic wave scattering signals in stainless steel for nondestructive evaluation (NDE). An empirical technique that is based upon treating the noise differently at different frequency scales is presented. In this approach the amount of pruning of small coefficients depends nonlinearly on their frequency scales. One somewhat surprising consequence of the analysis is that information etalons in phase space exist that must not be changed at all because they pass almost pure information on the radius of the flaw. This suggests the presence of islands of information in phase space for other attributes of flaws such as location, material properties, and boundary shape which are being addressed in other work.

Paper Details

Date Published: 8 July 1994
PDF: 13 pages
Proc. SPIE 2241, Inverse Optics III, (8 July 1994); doi: 10.1117/12.179737
Show Author Affiliations
David Matthew Patterson, Martin Marietta Corp. (United States)
Brian DeFacio, Univ. of Missouri/Columbia (United States)

Published in SPIE Proceedings Vol. 2241:
Inverse Optics III
Michael A. Fiddy, Editor(s)

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