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Développement d’une méthode de reconstruction ultrasonore pour la localisation et la caractérisation de défauts

Abstract : Techniques for nondestructive testing based on ultrasonic phased array probe are now increasingly used in industry. These probes offer many advantages, in particular use versatility and adaptability to complex configurations. More advanced acquisition techniques, such as “Full Matrix Capture”, provide access to collection of data richer and more complete than those provided by conventional techniques, offering so new possibilities in terms of localization and characterization of defects. The work of this thesis aims to implement imaging and reconstruction methods for various operating modes of UT array inspection. For this, we propose different methods derived from the so-called synthetic focusing. These methods rely on forward models developed at CEA LIST and implemented in the CIVA software platform. These models can also take into account the complex inspection configurations, especially in regard to the -irregular- surface inspected parts. At first, we were interested in locating point-like scatterer. Under this hypothesis, we evaluated the performance of the proposed methods when they are applied with different types of inspection operating mode. Next work has been refocused on the study of the Full Matrix Capture coupled to the algorithm called Focalisation en Tous Points (FTP), this combination has shown good performance in terms of defect localization. In a second step, we generalized our approach to extended defects and multiple ultrasonic paths. In particular, we applied the latest FTP algorithm to the localization and characterization of notch near the bottom of the part with corner echoes, echoes due to successive ultrasonic wave reflections on the bottom and defect. The different methods considered in this work have been applied with both simulated data and experimental measurements.
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Submitted on : Monday, October 29, 2012 - 2:37:15 PM
Last modification on : Sunday, June 26, 2022 - 11:57:17 AM
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  • HAL Id : tel-00746630, version 1



Alex Fidahoussen. Développement d’une méthode de reconstruction ultrasonore pour la localisation et la caractérisation de défauts. Autre [cond-mat.other]. Université Paris Sud - Paris XI, 2012. Français. ⟨NNT : 2012PA112147⟩. ⟨tel-00746630⟩



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