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Representation of the Freezing-In Phenomenon of Standing Ultrasonic Waves in Concentration Gradients by Means of the Optical Philpot-Svensson Method

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The optical Philpot-Svensson method, which was developed some time ago for research into diffusion processes, is used for the first time to image a standing ultrasonic wave. The characteristic of representation is, that this method yields directly in rectangular coordinates the graph of the gradient of the index of refraction of the standing wave. From this graph the variations in density, the sound pressure and other characteristics of the sound-field can subsequently be inferred. Of particular interest are standing ultrasonic waves in the diffusion path of a concentration gradient, because of the freezing-in phenomenon of the wave, which was observed by means of the schlieren arrangement and described in [1]. Details of this freezing-in phenomenon are shown and described by means of the new method.
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Document Type: Research Article

Publication date: September 1, 1972

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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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