Measuring and testing – Vibration – By mechanical waves
Patent
1984-10-19
1986-11-04
Levy, Stewart J.
Measuring and testing
Vibration
By mechanical waves
G01H 312
Patent
active
046204458
ABSTRACT:
A portable acoustic intensity measuring device comprising a pair of electroacoustic transducers at a positioned predetermined distance from one another. The measuring device utilizes analog summing, subtraction, integration and multiplier means for measuring an acoustic intensity vector midway between the two electroacoustic transducers. The acoustic intensity measuring device further comprises error correction means connected in circuit with a preamplifier means and a meter means. The error correction means includes switching means comprising a first switch connected in circuit with the preamplifier and summing means and subtraction means and a second switch connected in circuit with the multiplier and the meter for simultaneously switching the first and second preamplified analog signals at the summing input and subtraction input and for simultaneously switching the polarity of the acoustic intensity signal at the meter. The error correction means eliminates any errors induced by phase mismatch and/or any inherent DC component of the device.
REFERENCES:
patent: 1829644 (1931-05-01), Olson
patent: 2836656 (1958-05-01), Schultz
patent: 3658147 (1972-04-01), Ho et al.
patent: 3968697 (1976-07-01), Mutziger
F. H. Fahy, "Measurement of Acoustic Intensity Using the Cross-Spectral Density of Two Microphone Signals", Journal of Acoustical Society of America, vol. 62, pp. 1057-1059, 1977.
McKendree Francis S.
Zomp John M.
Chapman, Jr. John E.
Levy Stewart J.
Lombard R. S.
Westinghouse Electric Corp.
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