Determination of absorption characteristic of materials on basis of sound intensity measurement

Abstract
The coefficient of the acoustic absorption of the materials can be determined using two standard methods : the standing wave method and the reverberation room method. In this paper, starting from the fact that the sound intensity as vector quantity describes, beside the amount of the sound energy its direction as well and that intensity vector distribution on the floor of the rectangular rooms is rather uniform, a procedure of the absorption characteristics determination of the absorber specimen by measuring of the sound intensity is suggested. The comparative results of the absorption coefficient determination of the glass wool, obtained by reverberation room method and suggested procedure, are given. The first results point out to the possibility of the absorbed energy determination in the rectangular parallelepiped rooms, using suggested procedure on the basis of the sound intensity measurement.