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Proceedings Paper

Novel microwave method for detection of finite surface cracks in metals
Author(s): Chin-Yung Yeh; Reza Zoughi
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Paper Abstract

An electromagnetic model for finite surface crack detection is presented. An open-ended waveguide sensor is used to scan a cracked metal surface. The crack is modelled as a large waveguide feeding a smaller one. The characteristics of the standing wave set up in the waveguide is altered when the waveguide is terminated by an imperfect short circuit load (crack surface). This is due to the generation of higher order modes as a result of the presence of the crack. Strategic probing of the standing wave properties is used to indicate the presence of a crack. A Fourier boundary matching technique is used to satisfy the boundary conditions at the waveguide aperture and the crack boundaries. The behavior of crack characteristic signals as a function of crack size and location within the sensor aperture is also studied. A finite fatigue crack is finally detected at 38 GHz to demonstrate the practical feasibility of this technique.

Paper Details

Date Published: 14 September 1994
PDF: 9 pages
Proc. SPIE 2275, Advanced Microwave and Millimeter-Wave Detectors, (14 September 1994); doi: 10.1117/12.186707
Show Author Affiliations
Chin-Yung Yeh, Institute of Nuclear Energy Research (Taiwan)
Reza Zoughi, Colorado State Univ. (United States)

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

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