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Performances et apports des capteurs magnétiques à très haute sensibilité aux systèmes de contrôle Non Destructif par Courant de Foucault

Rimond Hamia 1, 2
Abstract : In recent years, the performance of high-sensitivity magnetic sensors have advanced considerably. Due to their intrinsic performances (sensitivity, noise, bandwidth, dynamic ...) these sensors offer new prospects for the development of systems Non Destructive Testing by Eddy Current. An important part of this thesis is to study, analyze and improve the performance of DDC systems by CF using magnetometers based GMR and developed in the Electronics team. Performance has been studied and analyzed in detail vis-à-vis the various parameters of the detection system. A 3-D numerical model based on finite element method was used to conduct this study. The simulation results have led to improvements in some parameters of the detection system, such as SNR, spatial resolution and the excitation frequency. Developed systems have excellent performance (especially a good SNR and high dynamic measurement) and provide the ability to detect faults deeply buried. Another important part of my work has been devoted to the detection of faults oriented. An original method of excitation based on the principle of a rotating magnetic field has been developed. It consists of using two perpendicular wire inductors driven by alternating currents whose amplitudes are modulated adequately to create adjustable currents induced orientation in areas inspected. The results show that the system is able to simply describe the orientation of the detected defect by analyzing the induced magnetic field in the test piece using the conventional Lissajous figures.
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  • HAL Id : tel-01076478, version 1

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Rimond Hamia. Performances et apports des capteurs magnétiques à très haute sensibilité aux systèmes de contrôle Non Destructif par Courant de Foucault. Electromagnétisme. Université de Caen, 2011. Français. ⟨tel-01076478⟩

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