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In Situ Technique for the Measurement of Acoustic Surface Impedance

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A method of measuring surface impedance in-situ is presented. A source is set close to the surface of the material, in order to minimize the finite dimension effect of the sample, and the effect of the reflections on the walls and the ceiling of the room. The pressure above the material is measured simultaneously with two microphones, and measurement is compared a model of Hayek.

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