Abstract
Static and dynamic air-flow impedance measurements were conducted with thin specimens of a variously sintered PVC powder. The results were interpreted by a statistical theory that expresses the parameters of a quasihomogeneous acoustic absorber in terms of porosity averages of channel radius and orientation. The low-frequency behavior of the air-flow impedance is determined by the porosity, a structure factor, and three different average channel radii that are related by inequalities. The latter could be established from general statistical considerations and were confirmed in most cases by experiment. Photomicrographs of sections through sintered powder layers were analyzed by stereological techniques in terms of specific surfaces. The channel radii derived from such measurements compared favorably with the average acoustic channel radii.
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