Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1983-12-19
1986-06-24
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
310321, 310330, G01F 120
Patent
active
045961530
ABSTRACT:
A flowmeter has a vane which is caused to vibrate at one of its resonant frequencies and a flexure standing wave set up along it. Two piezoelectric sensors are used to monitor characteristics of the standing wave and hence the mass flow rate of a fluid flowing past the vane along a pipe.
The vane comprises a ceramic planar member on which a conductive ceramic ink is laid down to form tracks. The ink also bonds a ceramic piezoelectric transducer to the member to drive and maintain it in vibration. A non-conductive layer is laid down on the surface of the member covering the conductive tracks surrounding the transducer. A metal layer forms the external surface of the vane and acts as a ground plane for the transducer.
REFERENCES:
patent: 2168943 (1939-08-01), Pfundt
patent: 2618579 (1952-11-01), Brajer
patent: 3218851 (1965-11-01), Sipin
Jarvis Charles R.
Langdon Roger M.
Macdonald George A.
Goldstein Herbert
The Marconi Company Limited
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