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Absorption longitudinaler Ultraschallwellen in Aluminium, bei hohen Temperaturen

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The sound-echo impulse method has been used to measure the absorption of longitudinal ultrasonic waves in two alloys of aluminium and in a single crystal of aluminium. The measurements have been made in a frequency range from 5 to 72 Mc/s and for temperatures varying from normal room temperature up to 400°C. For all the specimens a quadratic increase of absorption with frequency was obtained. However, whereas there was a continual increase of absorption with temperature in the case of the single crystal, there was a sudden rise for temperature above 300°C in the polycrystalline specimens.

In using this method of measurement the geometrical attenuation of the transmitted waves, making particular assumptions, has been calculated and the result compared with measurements made on a quartzglass cylinder. It has been found that the attenuation of the transmitted waves is less than to be expected and that, in the absorption measurements in the aluminium for the frequency range considered, it is practically negligible.
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Document Type: Research Article

Publication date: January 1, 1961

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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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