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Construction of a Measuring Apparatus to Record Directly Curves of Hydroacoustic Impedance in a Kundt Tube

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The present paper describes the development of a measuring apparatus to investigate acoustic properties of absorbers for underwater sound. A Kundt tube for underwater sound was constructed which may be operated in the frequency range of 1 kHz to 20 kHz at variable temperatures and variable static pressures (up to 40 at). The apparatus permits the choice of operation either by the pulse-echo-method or continuous wave operation by determining sound pressure and particle velocity simultaneously at a given location in the tube. The ratio of these two quantities is formed by an appropriate electronic apparatus. Thus the complex impedance or reflection coefficient can be recorded directly. The particle velocity is obtained from a pressure gradient microphone which is followed by an analogue integrator. Examples illustrate where the automatic registration of the curves can be applied and how it compares with the pulse-echo-method.
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Document Type: Research Article

Publication date: January 1, 1969

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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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