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Proceedings Paper

Preliminary results of detecting and locating defects under triangular thick composite structural members
Author(s): Jacob K. Easter; Nasser Qaddoumi; Reza Zoughi; Lawrence M. Brown; Johnnie J. DeLoach Jr.
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Paper Abstract

Thick triangularly shaped structural sections used in a variety of applications are inspected using open-ended microwave rectangular waveguide probes. Previous work has shown the ability of microwave techniques to detect and locate planar defects in thick composite structures. In all of those applications, the microwave sensor aperture has been parallel to the surface under inspection. However, in certain cases involving triangular joints, the geometry may require that the microwave sensor be positioned at an angle to the joint surface. Therefore, the inspection is conducted with the waveguide maintaining a certain angle with the surface of the sample. This angle causes the incident fields to bend at an angle which can be determined using Snell's law and the dielectric properties of the sample under inspection. The bending of the fields causes defects and internal structural features to appear at positions at which they are not actually located. The proper location of defects can be found by using Snell's law along with the geometrical and dielectric properties of the material under inspection. The preliminary results of this investigation, including the results of a simple mathematical model and several experimental results, are presented.

Paper Details

Date Published: 31 March 1998
PDF: 6 pages
Proc. SPIE 3396, Nondestructive Evaluation of Materials and Composites II, (31 March 1998); doi: 10.1117/12.301511
Show Author Affiliations
Jacob K. Easter, Colorado State Univ. (United States)
Nasser Qaddoumi, Colorado State Univ. (United States)
Reza Zoughi, Colorado State Univ. (United States)
Lawrence M. Brown, Naval Surface Warfare Ctr. (United States)
Johnnie J. DeLoach Jr., Naval Surface Warfare Ctr. (United States)

Published in SPIE Proceedings Vol. 3396:
Nondestructive Evaluation of Materials and Composites II
Steven R. Doctor; Carol A. Nove; George Y. Baaklini, Editor(s)

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