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Etude théorique de l'influence de l'anisotropie des matériaux sur l'étalonnage des transducteurs d'angle

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In the calibration of a wedge transducer with a block of anisotropic material one finds a shift of the point of emergence of the acoustic beam and the angle of incidence is modified. By using the results of the propagation of ultrasound in anisotropic media we have shown that these deviations can be explained in terms of the directions of wave and energy propagation being different.

The study of a simple theoretical model permits the exact determination of the angle of incidence () and the residual anisotropy (α) of the material.

Sommaire

Lorsque l'on effectue l'étalonnage d'un transducteur d'angle avec une câle constituée par un matériau anisotrope, on constate un déplacement du point d'émergence et une modification de l'angle d'incidence. En utilisant les résultats de la propagation des ultrasons dans les milieux anisotropes nous avons montré que l'on pouvait interpréter ces écarts en considérant que les directions de l'onde et de l'énergie sont différentes.

L'étude d'un modèle théorique simple permet la détermination de la valeur exacte de l'angle d'incidence () et la valeur de l'anisotropie (α) résiduelle du matériau.

Zusammenfassung

Wenn man einen Keilwandler mit einem Referenzblock aus einem anisotropen Material kalibriert, stellt man eine Verschiebung des Sendeorts und eine Veränderung des Einfallswinkels fest. Durch Anwendung der Ergebnisse über die Ultraschallausbreitung in anisotropen Medien wurde gezeigt, daß sich diese Abweichungen durch die Verschiedenheit der Richtungen der Wellenausbreitung und des Energieflusses erklären lassen.

Die Untersuchung eines einfachen theoretischen Modells erlaubt die Bestimmung des exakten Werts des Einfallswinkels () und des Anisotropieparameters (α) des Mediums.
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Document Type: Research Article

Publication date: October 1, 1980

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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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