Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1994-06-21
1995-08-22
Chilcot, Jr., Richard E.
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
7386115, G01F 100
Patent
active
054435528
ABSTRACT:
An electromagnetic flowmeter comprises a measurement tube through which a fluid flows the rate of flow of which is to be measured, a plurality of electrodes disposed on the inner wall of the measurement tube to face each other, excitation coils for applying a magnetic field to the inside of the measurement tube in a direction orthogonal to the axis of the tube, an excitation circuit for supplying the excitation coils with a rectangular excitation current in at least two excitation cycles, a flow-rate value calculating circuit for, when electromotive force is generated between the electrodes in each of the excitation cycles, extrapolating flow-rate signals based on the electromotive force generated during the excitation cycles to obtain a flow-rate value signal that would be obtained when the excitation cycles are made infinitely large, and a flow-rate value output circuit for outputting the flow-rate value signal obtained by the flow-rate value calculating circuit through extrapolation.
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Biegel R.
Chilcot Jr. Richard E.
Kabushiki Kaisha Toshiba
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