Investigating Hydroacoustic Properties of Materials

The study deals with designing an impedance tube for investigating acoustic reflectivity, acoustic absorption coefficient and acoustic impedance of various materials when used underwater. We employed our installation to determine hydroacoustic properties of the following soundproofing materials: three types of extruded polystyrene foam as well as a mixture of cement and wood chips. We describe our methods of conducting experiments, calibrating equipment and reducing instrument errors in measurement. We show that certain samples of extruded polystyrene foam have high acoustic absorption coefficients (up to 0.9) in the 3 to 6 kHz frequency range. We provide recommendations for using these materials to create underwater anechoic chambers

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