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Zur Bündelversetzung bei der Reflexion von transversalen Ultraschallwellen an freien Grenzflächen

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The reflection of a transverse wave beam at a free boundary surface is treated using the angular spectrum representation. It is shown that not only the reflected transverse wave but also the reflected longitudinal wave, which is degenerated in our case to a surface wave, is shifted. This latter shift of the surface wave is only the half of the other one. Both shifts change their signs for angles of incidence greater than 45°. This behavior becomes more evident if the energy flux is considered. Finally a comparison is made between the beam shift investigated in this paper and the beam shift which appears in the case of total reflection.

Zusammenfassung

Es wird die bei der Reflexion von transversalen Ultraschallwellen an freien Grenzflächen auftretende Bündelversetzung mit Hilfe einer Teilwellenentwicklung untersucht. Dabei zeigt sich, daß nicht nur die reflektierte Transversal welle sondern auch die zu einer quergedämpften Oberflächenwelle entartete Longitudinal welle eine Bündelversetzung erfährt, die allerdings nur halb so groß ist. Bei beiden Bündelversetzungen tritt für Einfallswinkel größer als 45° eine Vorzeichenumkehr auf. Dieses Verhalten wird besonders deutlich bei der Untersuchung der auftretenden Energieströme. Abschließend werden die erhaltenen Ergebnisse mit denen für den Fall der Totalreflexion verglichen.

Sommaire

On analyse, à l'aide d'un développement en ondes partielles, la translation que subit un faisceau d'ondes ultrasonores transversales à la réflexion sur une surface libre. Les ondes longitudinales dégénérées en ondes de surface subissent une translation analogue, mais d'amplitude moitié moindre. Pour ces deux translations, il se produit un changement de signe lorsque l'angle d'incidence dépasse 45°. Un tel comportement devient particulièrement évident lorsqu'on étudie les transferts d'énergie. Pour finir on compare les résultats obtenus avec ceux qui concernent la réflexion totale.
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Document Type: Research Article

Publication date: 1980-05-01

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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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