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Numerical modeling for the electromagnetic non-destructive evaluation: Application to the non-destructive evaluation of concrete.

Abstract : Concrete is the most common building material and accounts for a large part of the systems that are necessary for a country to operate smoothly including buildings, roads, and bridges. Nondestructive testing is one of the techniques that can be used to assess the structural condition. It provides nonperceptible information that conventional techniques of evaluation unable to do.

The main objective of this work is the numerical simulation of a particular technique of nondestructive testing: the radar. The numerical modeling of the radar assessment of concrete structures make it possible to envisage the behavior of the system and its capacity to detect defects in various configurations.

To achieve this objective, it was implemented electromagnetic wave propagation models in concrete structures, by using various numerical techniques to examine different aspects of the radar inspection. First of all, we implemented the finite-difference time-domain method in 3D which allows to take into account concrete characteristics such as porosity, salt content and the degree of saturation of the mixture by using Debye models. In addition, a procedure to improve the radiation pattern of bowtie antennas is presented. This approach involves the Moment Method in conjunction with the Multiobjective Genetic Algorithm. Finally, we implemented imaging algorithms which can perform fast and precise characterization of buried targets in inhomogenous medium by using three different methods. The performance of the proposed algorithms is confirmed by numerical simulations.
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https://tel.archives-ouvertes.fr/tel-00177523
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Submitted on : Monday, October 8, 2007 - 7:36:00 PM
Last modification on : Tuesday, September 1, 2020 - 2:44:16 PM
Long-term archiving on: : Sunday, April 11, 2010 - 10:26:20 PM

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  • HAL Id : tel-00177523, version 1

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Xisto Travassos. Numerical modeling for the electromagnetic non-destructive evaluation: Application to the non-destructive evaluation of concrete.. Other. Ecole Centrale de Lyon, 2007. English. ⟨tel-00177523⟩

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