Abstract
A method is described whereby measurements of the acoustic impedance of small orifices and membranes are made by comparison to a known impedance. The equipment required consists of a high impedance and a low impedance source of sound, a sound level meter, phase angle indicator, and a few easily constructed impedance references. The method is analogous to the electrical one where a known impedance is compared to an unknown using a constant voltage or constant current source and measuring the current or voltage. Data on the acoustic impedance of various types of cloth and metallic screens and membranes are given. Experimental results of impedance measurements of two orifices for various separations as well as for different shapes of orifices is also shown.
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