Sound intensity meter

Details Sound intensity meter Sound intensity meter

1978-08-17

1980-11-25

Konick, Bernard

73646, G01H 1100

Patent

active

042360404

ABSTRACT:
Acoustic intensity is measured by a pair of closely spaced microphones aligned in a given direction. One microphone is connected directly to an integrator the output of which is connected to a multiplier while the other microphone is connected directly to the multiplier. The multiplier output is proportional to the imaginary part of the cross-spectrum of the two microphone signals which when time averaged represents the absolute value of the sound intensity in the given direction if the microphone systems are properly phased matched.

REFERENCES:
patent: 1892644 (1932-12-01), Olson
patent: 1892646 (1932-12-01), Wolff
patent: 2836656 (1958-05-01), Schultz
patent: 3057960 (1962-10-01), Kaiser
patent: 3794766 (1974-02-01), Cox et al.
patent: 4061041 (1977-12-01), Fletcher et al.
T.J. Schultz; "Acoustic Wattmeter"; The Journal of the Acoustical Society of America; vol. 28, No. 4; Jul. 1956; pp. 693-699.
F. Fahy; "Measurement of Acoustic Intensity Using the Cross-Spectral Density of Two Microphones"; Journal of Acoustics Society of America; vol. 64, No. 4; Oct. 1977; pp. 1057-1059.
F. Fahy; "A Technique for Measuring Sound Intensity With a Sound Level Meter"; Noise Control Engineering; Nov./Dec. 1977; vol. 9, No. 3; pp. 155-162.

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