Electromagnetic nondestructive evaluation of materials from incomplete EMIR data

Pliquet, B.; Levesque, P.; Duche⁁ne, B.; Ferrieres, X.; Alliot, J. C.
May 2000
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p557
Academic Journal
We are concerned herein with electromagnetic nondestructive evaluation of dielectric materials from data collected by means of the EMIR (ElectroMagnetic InfraRed) method which allows fast and accurate measurements of electromagnetic fields, at microwave frequencies, over a large probing surface. The goal is to build up a map of the electromagnetic parameters of an unknown object from measurements of the scattered field that results from its interaction with a known incident wave. The EMIR method consists of measuring the heating of a thin photothermic film located near the object under test by means of an infrared camera, this heating being proportional to the intensity of the electric field component tangential to the film. The first part of the paper will be devoted to the evaluation of the EMIR method by comparing the results obtained in 2D-TM configurations, with cylindrically stratified objects at several frequencies lying in between 8–12 GHz to numerical results obtained from a modal expansion of the fields. The second part will be devoted to the nondestructive evaluation of dielectric cylinders. The wave-defect interaction is described as a classical scattering problem through two contrast sources integral representation of the fields. The nondestructive evaluation is then dealt with as an inverse scattering problem. As is well known such problems are generally non-linear and ill-posed, and, in the present case, this ill-posedness is enhanced by the incomplete (phaseless) aspect of the data collected with EMIR. We will focus on gradient type nonlinearized iterative techniques able to cope with this drawback. © 2000 American Institute of Physics.


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