Acoustic ground impedance meter
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United States of America Patent
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-
May 1, 1984
Grant Date -
N/A
app pub date -
Nov 24, 1982
filing date -
Nov 24, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Method and apparatus for measuring the acoustic impedance of a surface in which the surface is used to enclose one end of the chamber of a Helmholz resonator. Acoustic waves are generated in the neck of the resonator by a piston driven by a variable speed motor through a cam assembly. The acoustic waves are measured in the chamber and the frequency of the generated acoustic waves is measured by an optical device. These measurements are used to compute the compliance and conductance of the chamber and surface combined. The same procedure is followed with a calibration plate having infinite acoustic impedance enclosing the chamber of the resonator to compute the compliance and conductance of the chamber alone. Then by subtracting, the compliance and conductance for the surface is obtained.
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