Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1984-05-01
1986-07-22
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
7386118, 310327, 310336, G01F 166
Patent
active
046012109
ABSTRACT:
An ultrasonic flowmeter of the upstream-downstream type having piezoelectric crystals operated in the radial mode, as well as the compression mode, or primarily the radial mode. If both modes are used, one of the two may be selected in order to optimize the received signal. Selection would depend upon the molecular weight and temperature of the viscous fluid in the flowmeter. The selected frequency would be below the relaxation frequency of the flowing material. Radial mode oscillations are achieved by mass loading members adhered to either side of the crystal, thereby creating acoustic impedances which dampen the compressional mode, but enhance the radial mode of vibration. The mass loading member rearward of the crystal is significantly larger than the forward member so that most of the energy to be transmitted is directed in a forward direction. The forward end of the crystal is mounted in a tubular housing which is inserted into a pipe opening into a larger pipe where fluid flow occurs.
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Manning Technologies, Inc.
Ruehl Charles A.
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