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Proceedings Paper

Electromagnetic localization of defects in carbon epoxy composite materials
Author(s): Michel B. Lemistre; Remi Gouyon; Daniel L. Balageas
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Paper Abstract

When an imperfectly conductive structure is illuminated by an electromagnetic wave, its response, on the magnetic component, is comparable to a first order integrator, if the skin effect is negligible at the wave frequency. Using this model, we have developed a method and a magnetic prove allowing to build 'electric images' of the defects present in carbon epoxy composite materials, by measurement of magnetic field transmission in these materials. After a presentation of the theory of electromagnetic scattering in a non perfectly conductive materials from M.A. Bethe and K.F. Casey, we demonstrate that it is not necessary to perform the magnetic field attenuation measurement by transmission; we can proceed on one face of the sample, by reflection, obtaining the same result. We present the experimental set up and the magnetic probe developed, we show several images achieved on samples having induced defects and we compare these image with the images achieved by a classical ultrasonic method on the same specimens. Furthermore we present images produced by integration in a structure of a 'sensor-network' based on the principle used by the probe.

Paper Details

Date Published: 15 March 1998
PDF: 8 pages
Proc. SPIE 3399, Process Control and Sensors for Manufacturing, (15 March 1998); doi: 10.1117/12.302540
Show Author Affiliations
Michel B. Lemistre, ONERA (France)
Remi Gouyon, ONERA (France)
Daniel L. Balageas, ONERA (France)

Published in SPIE Proceedings Vol. 3399:
Process Control and Sensors for Manufacturing
Richard H. Bossi; David M. Pepper, Editor(s)

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