Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1992-11-23
1993-12-21
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
7386112, G01F 160
Patent
active
052712800
ABSTRACT:
A device to measure the flowrate of electrically charged fluids consisting of a pipe section through which the fluid flows which contains at least two current sources connected to electromagnets, which generate a magnetic field which extends through the pipe section, and which contains for the measurement of the electrical potential due to the charge differential at least two electrodes, whose axes are connected by an imaginary line which extends through the fluid flow, and which electrodes are connected to a correction circuit which produces an output signal proportional to the flowrate which is only minimally influenced by the flow profile and/or the level of the fluid in the pipe section characterized by electromagnets which are excited from the current sources by different frequencies and that between the electrodes and the correction circuit are connected parallel to each other band pass filters corresponding to the different frequencies, and connected after these band pass filters are dc rectifiers controlled by the different frequencies.
REFERENCES:
patent: 4658653 (1987-04-01), Tomita
patent: 4773274 (1988-09-01), Kobayashi et al.
patent: 5090250 (1992-02-01), Wada
H. Ostling, "Dual Frequency Excitation Sets New Magmeter Performance Standard," Control Engineering, vol. 10, at pp. 20-21 (Sep., 1990).
Dougherty Elizabeth L.
Goldstein Herbert
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