Fraunhofer-Forschungsgruppe Hydroakustik FHAK

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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.

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Entwicklung und Anwendung von akustischen Modelltechnologien

1982 , Brebeck, D. , Spengler, G. , Zurnatzis, S.

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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.

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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.

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