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Ausbreitung akustischer Wellen in einer Niederdruckentladung

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An experimental device is described here by means of which acoustic waves have been excited in the direction of the longitudinal axis of a gas discharge over a frequency range of 300 c/s to 15 kc/s. The discharge tube was filled with air having a slight addition of mercury vapours.

Measurements were taken in the pressure interval of 10−1 torr to 20 torr. Since the lowpressure discharge represents a partially ionized medium containing electrons, ions, and neutral particles the acoustic waves propagate both through the medium of neutral particles and through that of ionized particles at the same time. These waves are called electroacoustic waves. By means of the experimental device described here, the dependence of the propagation velocity of the electro-acoustic waves on the direct current of the discharge was measured over the pressure interval of 6 torr to 20 torr, for two different frequencies.

The values obtained by measurement were of the same order as those calculated from the relation for propagation velocity of electro-acoustic waves derived from a system of hydrodynamic equations.

Furthermore the paper presents some measured values of the experimental dependence of the perturbed alternating current, produced by an acoustic wave when propagating through the medium of ionized particles, on the parameters of discharge plasma.
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Document Type: Research Article

Publication date: January 1, 1965

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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