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Pseudo-Stationary Ultrasonic Fields in Fluids

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Following Borgnis considerations on acoustic interferometer, a “real” (pseudo-stationary) field is investigated and the interferometer behaviour is theoretically derived, analyzing the difference between the gaseous and liquid medium.

Energetic considerations are then derived and the fixed-force liquid interferometer is analyzed.

Authors underline also the original interpretation of a pseudo-stationary field as a superposition of a pure stationary field and a progressive beam.


In Verfolgung der Überlegungen von Borgnis zum akustischen Interferometer wurde ein «reales» (pseudostationäres) Feld untersucht. Das Interferometer-Verhalten wird theoretisch durch Analyse des Unterschieds zwischen gasförmigem und flüssigem Medium hergeleitet. Es werden Energiebetrachtungen angestellt, ferner wird das Flüssigkeitsinterferometer mit eingeprägter Kraft analysiert.

Die Autoren folgen der ursprünglichen Interpretation eines pseudostationären Feldes als Überlagerung eines rein stationären Feldes und einer fortschreitenden Welle.


A la suite des remarques de Borgnis sur l'interférométrie acoustique, on a étudié un champ acoustique ,,réel“ (pseudo-stationnaire). On en déduit le principe de fonctionnement d'un inter-féromètre et on analyse les différentes caractéristiques entre les cas d'un milieu gazeux et liquide.

Des considérations énergétiques mènent d'autre part au principe d'un interféromètre à force fixe pour milieux liquides.

Une interprétation originale des auteurs présente le champ pseudo-stationnaire comme la superposition d'un champ stationnaire et d'une onde progressive.
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Document Type: Research Article

Publication date: July 1, 1979

More about this publication?
  • 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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