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The Use of Harmonics in Ultrasound Diffraction Tomography Utilisation des harmoniques en tomographie ultrasonore par diffraction

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In order to increase images resolution, this study present the use of the harmonics wave generated by ultrasonic distortion, in diffraction tomography imaging. The image reconstruction is based on Fourier diffraction theorem. The experimental setup is based on a 3 MHz circular transducer with 2 cm of diameter. Transmitted field is detected using a wide bandwith hydrophone. A comparison between the image of the fundamental wave with the images of the three successive harmonics waves shows that the quality of the image increases with the harmonic order. This improvement is due to beam directivity and secondary lobes attenuation.

En vue d'augmenter la résolution des images, cette étude présente l'intérêt d'utiliser les harmoniques générés par distorsion ultrasonore en tomographie par diffraction. La reconstruction des images est bas ée sur la méthode analytique de Fourier. Le dispositif expérimental utilise un disque piézo-électrique de 2 cm de diamètre émettant à 3 MHz. Un hydrophone large bande à la réception permet de mesurer le champ transmis. Une comparaison entre l'image du fondamental et les images des trois harmoniques successifs montre que la qualit é de l'image augmente avec l'ordre de l'harmonique utilisé. Cette amélioration est due à la bonne directivité du faisceau et à l'atténuation des lobes secondaires.
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Language: French

Document Type: Research Article

Publication date: March 1, 2001

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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