Development of the Specular Echoes Estimator to predict relevant modes for Total Focusing Method imaging

Abstract : Total Focusing Method imaging based is an ultrasonic testing method which has emerged in recent years as alternative to standard phased array inspection methods in non-destructive testing, due to its high resolution and the realistic images of defects it provides. In case of crack like defects, it provides realistic images where the profile and the tips of the defects are reconstructed. TFM imaging relocates energy of temporal signals at the spatial position of the reflectors which gave them birth. Thereby, di ffraction echoes are located at the tip of the defect, and specular echoes appear along the proof le of the defect. This signature allows to characterise with con fidence the planar nature of the defect. However, a correct reconstruction requires to use the relevant ultrasonic path to produce the wanted echoes among a large number of possible paths between the array transducer and the reflector. In this paper, we have developed a method based on physical considerations, for predicting relevant paths. The developed tool will be applied on several inspection con gurations involving notches nearby welds. Validation will be achieved from a variety of synthetic and experimental results.
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https://hal-centralesupelec.archives-ouvertes.fr/hal-01634299
Contributeur : Dominique Lesselier <>
Soumis le : lundi 13 novembre 2017 - 21:51:55
Dernière modification le : jeudi 5 avril 2018 - 12:30:06

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  • HAL Id : hal-01634299, version 1

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Kombossé Sy, Philippe Bredif, Ekaterina Iakovleva, Olivier Roy, Dominique Lesselier. Development of the Specular Echoes Estimator to predict relevant modes for Total Focusing Method imaging. 2017. 〈hal-01634299〉

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