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Druckkammerverfahren zur Messung von akustischen Impedanzen kleiner Körper (Mikrophone) in Fülssigkeiten

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An oil-filled pressure chamber, which is small compared to the wavelength, is provided with two barium titanate discs. One of the discs generates a volume displacement v in proportion to the applied voltage. The alternating pressure p built up in the chamber by the volume displacement v is inversely proportional to the compliance K′ = — v/p, it is detected and measured with the help of the second titanate disc. If part of the oil in the test chamber is replaced by a test sample, the over-all compliance is K′ = K k + K ö + K m, with K k the compliance of the test chamber and K ö the compliance of the oil. From the compliance K m of the sample the acoustical impedance Z m = l/j ω K m of the sample is obtained.

The apparatus described here permits measurements of the complex compliance of small inhomogeneous bodies (up to 20 cm3) as for example hydrophones, in the range

0,35·10−9 cm5/dyn < | Km | < 14·10−9 cm5/dyn (1 : 40)

in the frequency range 125 c/s to 8 kc/s (6 octaves).
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Document Type: Research Article

Publication date: January 1, 1962

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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