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Impedance tube for measuring sound absorption coefficient and transmission loss coefficient
Hodinka, Tomáš ; Balík, Miroslav (referee) ; Skvaril, Šimon (advisor)
The goal of this thesis is the design and manufacture of the mechanical and electrical components of the impedance tube. The impedance tube is a tool used in laboratories, that has its parameters dictated by norms. On one side of this enclosed airtight tube is a speaker, and on the other the measured material. By switching some additional parts, the tube is capable of measuring not only the acoustic absorption, but also sound penetration. Impedance tube is made, so that it is robust, easy to manipulate and use, and easy to store. The designed impedance tube can measure the sound penetration of any material, that is up to 50mm in thickness, and the acoustic absorption of materials that are up to 120mm in thickness. Parts of the tube, that are directly welded to the tube itself are made of the same metal that the tube itself is, and the speaker enclosure is made from plywood. Along with the assembly of the impedance tube, a complete and detailed drawing documentation for future recreation is added, along with a suitable amplifier and all peripherals necessary for measurements.
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