Acoustic impedance measurement

Details Acoustic impedance measurement Acoustic impedance measurement

1985-12-26

1988-03-22

Levy, Stewart J.

Measuring and testing

Vibration

By mechanical waves

73588, G01N 2904

Patent

active

047320397

ABSTRACT:
A flexible U-shaped channel is abutted against a surface to be measured, thereby forming an acoustic duct, with the surface forming one wall of the duct. An acoustic source injects sound waves into the duct traveling parallel with the surface in order to establish a standing acoustic wave. Measurements of acoustic pressure at several points allows one to compute k.sub.y, the acoustic wave number normal to the surface, and from k.sub.y to compute the acoustic impedance of the surface.

REFERENCES:
patent: 4305295 (1981-12-01), Andersson et al.
patent: 4397187 (1983-08-01), Stribling
patent: 4537630 (1985-08-01), Syed
Article: "Error Analysis of Spectral Estimates with Application to the Measurement of Acoustic Parameters Using Random Sound Fields in Ducts", by A. F. Seybert and Benjamin Soenarko, J. Acoust. So. Am., vol. 69, No. 4, Apr., 1981, pp. 1190-1199.

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