Fraunhofer-Forschungsgruppe Hydroakustik FHAK

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  • Publication
    Recent development in measuring material parameters by a tube facility
    ( 1991)
    Brebeck, D.
    Paper describes a tube facility for investigations in underwater acoustics. The purpose is the measurement of physical parameters of materials. The device can be driven in the pulse mode and in the standing wave mode. The pulse mode delivers the echo reduction of test material at normal incidence. The standing wave mode is used to measure and calculate the input impedance of the material in magnitude and phase.
  • Publication
    A novel tube device for measuring hydroacoustic properties of homogeneous and layered materials
    ( 1991)
    Brebeck, D.
    Paper describes a tube facility for investigations in underwater acoustic. The purpose is the measurement of physical parameters of materials. The device can be driven in the pulse mode and in the standing wave mode. The pulse mode delivers the echo reduction of a test material at normal incidence. The standing wave mode is used to measure and calculate the input impedance of the material in magnitude and phase.
  • Publication
    Determination of the sound speed in materials by measurements at thin plate samples in free-field water
    ( 1991)
    Brebeck, D.
    ;
    Tilmann, P.
    In order to determine the sound speed of a layer of an unknown material by measurements in the free-field the advantages of the velocity transfer coefficient of the layer is investigated in comparison to the more usual reflection coefficient and transmission coefficient. A few test measurements are presented which show in principal the feasibility of the sound determination using the velocity transfer coefficient.
  • Publication
    Entwicklung und Anwendung von akustischen Modelltechnologien
    ( 1982)
    Brebeck, D.
    ;
    Spengler, G.
    ;
    Zurnatzis, S.