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Improvements to ultrasonic imaging with post-processing of full matrix capture data

Authors: Deschênes Labrie, Patrick;

Improvements to ultrasonic imaging with post-processing of full matrix capture data

Abstract

Ce mémoire présente les comparaisons entre les différentes méthodes de reconstruction "Total Focusing Method" (TFM) et des différents algorithmes modifiés qui utilisent les données obtenues avec la "Full Matrix Capture" (FMC) dans le but d'améliorer certains points clés présents dans les méthodes d'imageries, tel que les problèmes de reconstructions en sous-résolution ou bien des améliorations sur la détection. Les algorithmes conçus sont comparés en analysant les mêmes données pour les différents cas. De ces cas, l'imagerie de défauts isolés et puis ensuite celle d'une séquence de défauts très rapprochée ont été effectuées. Différentes recherches ont été effectuées sur les performances des algorithmes de reconstruction TFM en basse résolution. Ce mémoire montre que tous les types d'algorithmes présentés, soit la TFM standard, la TFM avec enveloppe d'Hilbert, la TFM intégration, la TFM intégration avec enveloppe d'Hilbert, la TFM restreinte en angle, la Migration et la Migration d'Hilbert sont toutes des méthodes valides de post-traitements des données capables d'imager convenablement les défauts présentés. Les différentes méthodes de reconstruction démontrent également des habilitées dépassant celles de la TFM standard dans certains points clés, en ayant seulement quelques points négatifs, tel que les temps de traitement ou bien l'augmentation du bruit de l'image.

This study shows the comparison between standard Total Focusing Method (TFM) and various modified algorithms using the data obtained from the Full Matrix Capture (FMC) in order to improve on some key points present in the aforementioned standard method of imaging, such as sub-resolution problems and improvements on detection. The designed algorithms were compared by processing the same data for different cases. Off those cases, the imaging of isolated defects and then imaging an array of close defects were analyzed. Further work have also been done on the performance of TFM algorithms in low resolution settings. The study has shown that all presented algorithms, which are the standard TFM, the Hilbert envelope TFM, the integration TFM, the Hilbert integration TFM, the angle restricted TFM, the Migration and the Hilbert Migration are all valid image post-processing reconstruction methods able to properly detect the defects presented. The different reconstruction methods used have also shown to outperform the standard TFM in a few key points, while having a few negative points such as the processing time and the increase noise.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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