Measuring and testing – Volume or rate of flow – Using rotating member with particular electrical output or...
Patent
1981-01-26
1983-09-20
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Using rotating member with particular electrical output or...
7386187, G01F 175
Patent
active
044048602
ABSTRACT:
A flowmeter for measuring the flow rate of fluids, having a range from a very low to a very high value. An impeller is located in a pipe for rotation with the flow of fluid. Metallic vanes of the impeller pass through the field of an inductor which is in a series circuit with a capacitor. An oscillator applies a signal at the series resonant frequency of the capacitor and inductor. The envelope of the resulting high voltage signal across the inductor is detected, filtered, and the resulting output pulses in excess of a minimum threshold can be applied to a counting apparatus for establishing the flow rate with high sensitivity. Since the spacing between the impeller and pickup is not critical, a meter is provided which does not clog with magnetic or non magnetic particles suspended in the fluid to be measured. The meter pickup can also be used to sense the rotation rate of wheels or the like having metallic discontinuities, whereby the speed of a vehicle, the rotation rate of a shaft, etc. can be determined.
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Walewsni et al., "Position Detection Device Using Amplitude Modulation", in I.B.M. Tech. Disc. Bulletin, vol. 14, #7, 12/71, pp. 2119-2120.
Okkerse Simon W. J. H.
Wood Hugh C.
Goldstein Herbert
Levine Alan H.
SED Systems Inc.
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