Acoustic ground impedance meter

Details Acoustic ground impedance meter Acoustic ground impedance meter

1982-11-24

1984-05-01

Ciarlante, Anthony V.

Measuring and testing

Vibration

By mechanical waves

73594, 367189, 181121, G01N 2900

Patent

active

044453787

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.

REFERENCES:
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patent: 1816917 (1931-08-01), Smythe et al.
patent: 2837914 (1958-06-01), Caldwell
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patent: 3710615 (1973-01-01), Johnson et al.
patent: 3883841 (1975-05-01), Norel et al.
patent: 3934673 (1976-01-01), Silverman
patent: 4283953 (1981-08-01), Plona
patent: 4325255 (1982-04-01), Howard et al.

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