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Transducteurs mono-éléments pour l'imagerie ultrasonore haute résolution : modélisation, réalisation et caractérisation

Abstract : Applications of ultrasonic imaging such as medical diagnostics and non-destructive testing tend to require improvement of resolution. Resolution being mainly linked to the operating frequencies of the systems, there is a need for ultrasonic transducers having a high center frequency, large bandwidth as well as strong focusing. Here, several modeling methods of the transducer and its radiation diagram are implemented in order to describe an acoustically focused source. The electroacoustic response and radiated field are evaluated and compared for various materials. In order to optimize transducer performance, new compositions and thick film deposition techniques of piezoelectric materials are tested and compared with classical fabrication methods. Several transducers are manufactured and their performance compared to those predicted by our models. Finally, they are integrated in a real-time high frequency ultrasonic scanner and used to produce in vivo images of human skin.
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https://tel.archives-ouvertes.fr/tel-00010031
Contributor : Pierre Marechal <>
Submitted on : Wednesday, February 14, 2007 - 6:05:43 PM
Last modification on : Tuesday, February 18, 2020 - 5:18:01 PM
Long-term archiving on: : Tuesday, September 21, 2010 - 12:41:26 PM

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  • HAL Id : tel-00010031, version 2

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Pierre Marechal. Transducteurs mono-éléments pour l'imagerie ultrasonore haute résolution : modélisation, réalisation et caractérisation. Acoustique [physics.class-ph]. Université François Rabelais, 2004. Français. ⟨tel-00010031v2⟩

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