19th INTERNATIONAL CONGRESS ON ACOUSTICS

The Biot-Allard model is commonly used to model porous materials which are used for a wide range of applications like sound and vibration insulation and sound absorbers in building and vehicle acoustics. The acoustical behavior of these materials is governed by the material properties of the porous structure (pore size, pore distribution, porosity, elasticity). The last ten years the laboratory has been involved in developing non-contact ultrasound measuring techniques which can estimate these material properties. These non-destructive techniques are based on the high frequency asymptotical behavior of the Biot-Allard model and were developed with the focus on characterizing very soft and highly porous materials. Recent research is focused on the application of these techniques and the Biot-Allard model for the description of a wider range of materials like e.g. bone, food products