Measuring and testing – Vibration – By mechanical waves
Patent
1995-02-28
1995-10-24
Williams, Hezron E.
Measuring and testing
Vibration
By mechanical waves
7386118, 7386127, 73597, G01N 2900, G01F 120
Patent
active
054600472
ABSTRACT:
A sensor system includes an ultrasonic transducer head with plural transducing elements. The elements are arranged in pairs with the first one of each pair lying in a first plane and the second one of each pair in a second plane spaced a half wavelength away. For transmission, the two are driven out of phase, while for reception their outputs are combined differentially. By changing the drive frequency the transmitted beam is steered to compensate for changes in transducer alignment, or changes in acoustic path caused by abnormal temperature, pressure or flow velocity. In another embodiment, an assembly has a plurality of transducers aligned along slightly divergent paths. Preferred systems employ an upstream and a downstream transducer assembly, each of which is used to alternately transmit and receive signal energy.
REFERENCES:
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patent: 4162630 (1979-07-01), Johnson
patent: 4445389 (1984-05-01), Potzick et al.
patent: 4555951 (1985-12-01), Gutterman
patent: 4596133 (1986-06-01), Smalling et al.
patent: 4838127 (1989-06-01), Herremans et al.
Lawrence C. Lynnworth, Ultrasonic Measurement for Process Control Academic Press, Inc. 1989 pp. 306, 308, 357-358, 628-629.
Ashraf Nashmiya
Panametrics, Inc.
Williams Hezron E.
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