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Effect of Pulse-Width on the Measurement of the Ultrasonic Shear Absorption in Viscous Liquids

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The amplitude decay of pulses of shear mechanical oscillation resulting from the attenuation by a viscoelastic liquid has been investigated for varying pulse-widths. It has been shown that significant corrections must be applied to the simple exponential decay, normally associated with the measurement of the absorption coefficient, α. The modified decay scheme lends support to the measurement of α by an alternative experimental procedure.

Zusammenfassung

Für unterschiedliche Pulsbreiten wurde der von der Dämpfung durch eine viskoelastische Flüssigkeit hervorgerufene Amplitudenabfall mechanischer Scherschwingungs-Pulse untersucht. Es wurde gezeigt, daß der normalerweise mit der Messung des Absorptionskoeffizienten α assoziierte, einfache exponentielle Abfall signifikant korrigiert werden muß. Das modifizierte Abklingschema legt alternative, experimentelle Anordnungen zur Messung von α nahe.

Sommaire

La diminution d'amplitude d'oscillations mécaniques de cisaillement du fait de leur atténuation par contact avec un liquide viscoélastique a été étudiée, en régime puisé, et en fonction de la largeur des impulsions utilisées. Il est montré que d'importantes corrections sont à apporter à la loi de décroissance simplement exponentielle qui est associée ordinairement à la mesure du coefficient d'absorption α. La loi de décroissance modifiée conduit normalement à un nouveau procédé expérimental pour mesurer α.
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Document Type: Research Article

Publication date: August 1, 1978

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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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