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Apparatus for the Direct Measurement of the Acoustic Impedance of Small Apertures

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An apparatus has been developed for the direct measurement of the real and imaginary parts of the acoustic impedance of small apertures in liquids over the frequency range of 10 to 1000 Hz. Two piezoelectric hydrophones serving as volume velocity source and pressure transducer, together with the confining liquid, are contained in a small chamber, which is terminated with the pertinent acoustic element. The calibration and accuracy of the system are studied, and the acoustic impedance of a small orifice is measured in an evaluation of the behaviour of the apparatus.
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Document Type: Research Article

Publication date: May 1, 1999

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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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