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Messung der Ultraschallintensitdt mit dem Hitzdraht

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A survey of the literature shows, that no clear picture can be derived from the publications known so far on the relations between sound intensity and the non-periodic change of resistance of a pre-heated wire due to cooling.

In order to make use of the hot-wire in absorption measurements with the ultrasonic interferometer calibration measurements were carried out at 287.75 kc/s in dry carbon dioxide. As a measure for the sound intensity the electric input power of the quartz transmitter was determined by directly measuring current, voltage and phase with the help of a cathode ray oscilloscope. Over a range of lower intensities — broad enough for experimental purposes — a linear relation between the sound intensity and the change of voltage at the hot-wire was found. It is, however, proved that this simple relationship makes the hot-wire unsuited to measure the sound absorption with the interferometer. At higher intensities no simple relationship was found.
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Document Type: Research Article

Publication date: January 1, 1958

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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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