Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1985-08-29
1987-02-24
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
7386117, G01F 160
Patent
active
046447997
ABSTRACT:
A square wave excitation current is supplied to an excitation coil. A magnetic field generated in this coil is impressed on an electrically conductive fluid. The voltage induced in the electrically conductive fluid is drawn out as a flow rate signal by means of a pair of electrodes. The issue of the flow rate signal is delayed by the sample hold circuit to an extent corresponding to half the period of the flow rate signal. A differential amplifier determines a difference between the level of the flow rate signal and that of the delayed signal. The noise component of the delayed signal is offset against the noise component of the flow rate signal, thus issuing a signal having a level corresponding the level difference. The flow rate of the electrically conductive fluid is determined from the level of an output signal from the differential amplifier.
REFERENCES:
patent: 3965738 (1976-06-01), Watanabe
patent: 4206641 (1980-06-01), Takada
patent: 4382387 (1983-05-01), Hafner
Goldstein Herbert
Kabushiki Kaisha Toshiba
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