Acoustic impedance measurement

Details Acoustic impedance measurement Acoustic impedance measurement

1983-05-31

1985-08-27

Ciarlante, Anthony V.

Measuring and testing

Vibration

By mechanical waves

G01N 2904

Patent

active

045376301

ABSTRACT:
An open-ended acoustic impedance tube is abutted against a material having a known acoustic impedance and a standing wave pattern is established in the tube. A first apparent impedance of the material is derived based on the standing wave pattern. A correction factor is computed based on the known impedance and the first apparent impedance. The open-ended impedance tube is then abutted against a sample material and a second apparent impedance is derived. The actual impedance of the sample is inferred from the second apparent impedance and the correction factor.

REFERENCES:
patent: 4397187 (1983-08-01), Stribling
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. Soc. Am., vol. 69, No. 4, Apr. 1981, pp. 1190-1199.

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