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Proceedings Paper

New solution for the reflection properties of the dominant TE10 mode in a rectangular waveguide due to surface cracks
Author(s): F. Jay Bourland; Brian E. Skahill; Chin-Yung Yeh
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Paper Abstract

A mathematical model is described for a new microwave nondestructive testing method for surface crack detection in metals. The crack detection method uses an open-ended waveguide to scan the surface of a metal. The method's foundation is the observation that the standing wave experiences a phase shift when a crack is present within the waveguide aperture. The model exploits the small width of the crack to reduce a Helmholtz equation on a complicated geometry to three simpler problems that are solved using the method of matched asymptotic expansions. Simplifications are possible when the crack position and cross-section are independent of distance along the crack. It is shown that the crack behaves like a resonant cavity as the crack enters the waveguide aperture.

Paper Details

Date Published: 14 September 1994
PDF: 8 pages
Proc. SPIE 2275, Advanced Microwave and Millimeter-Wave Detectors, (14 September 1994); doi: 10.1117/12.186733
Show Author Affiliations
F. Jay Bourland, Colorado State Univ. (United States)
Brian E. Skahill, Colorado State Univ. (United States)
Chin-Yung Yeh, Institute of Nuclear Energy Research (Taiwan)

Published in SPIE Proceedings Vol. 2275:
Advanced Microwave and Millimeter-Wave Detectors
Satish S. Udpa; Hsiu C. Han, Editor(s)

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