Abstract
The in situ method to measure the surface impedance with a pu probe documented is published in many publications. The method is based on the measurement of sound pressure (p) and particle velocity (u) close to an acoustic absorbing material. A loudspeaker at a defined distance is applied to generate a sound field with a known radiation impedance. The impedance of a small area (a few square cm2) with a known impedance is scanned with an ultraminiature pu probe very close to the surface. The area is made of steel with a cut-out, behind this a material with a known impedance is placed. In this paper the method is explained, the spatial accuracy of the measurement is examined, and a visualization technique is presented with a display of the spatial distribution (two dimensional picture) of the damping properties as function of frequency. Finally the high-resolution measurements are combined and compared with a method that covers a larger surface area.
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