Measuring and testing – Frictional resistance – coefficient or characteristics – Lubricant testing
Patent
1990-11-14
1992-06-30
Williams, Hezron E.
Measuring and testing
Frictional resistance, coefficient or characteristics
Lubricant testing
73659, 367 13, 36457104, H04R 2900
Patent
active
051252600
ABSTRACT:
A calibrator and the derivation of an associated calibration data base for computationally compensating for gain and phase mismatch in sound intensity probes comprised of two unmatched pressure transducing microphones is described herein. The calibrator utilizes a unique `phase plug` to maintain temporal uniformity (in addition to standard spatial uniformity) in the sound field of the calibration chamber. Gain and phase calibration factors are independently obtained for each probe of interest using the calibrator and these data are compiled into an independent data base for storage and subsequent application. Such linear correction factors as applied to associated signal processing of probe measurements serves to computationally compensate for phase mismatch between the unmatched microphone pair.
REFERENCES:
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patent: 3098211 (1963-07-01), Gerber
patent: 4205394 (1980-05-01), Pickens
patent: 4375679 (1983-03-01), Park, Jr. et al.
patent: 4473797 (1984-09-01), Shiota
patent: 4715219 (1987-12-01), Frederiksen
Davis Jr. James C.
Finley Rose M.
General Electric Company
Scanlon Patrick R.
Webb II Paul R.
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