Flow sensor and method for measuring a flow rate component...

Details Flow sensor and method for measuring a flow rate component... Flow sensor and method for measuring a flow rate component...

2007-07-24

2007-07-24

Thompson, Jewel (Department: 2855)

Measuring and testing

Volume or rate of flow

By measuring electrical or magnetic properties

Reexamination Certificate

active

10544671

ABSTRACT:
The invention relates to measurement of a fluid flow, wherein a flow rate component of the fluid is measured along a selected direction. A magnetic field whose polarity varies over time is applied to the fluid, which presumed to contain electrically charged elements. First and second sensor electrodes (120, 121) are arranged to be wetted by the flowing fluid. The electrodes (120, 121) are spaced apart from one another along a line being substantially perpendicular both to the selected flow direction and a magnetic axis of the magnetic field. A DC-level drift of the sensor electrodes (120, 121) is prevented by supplying a control current (Ictrl-0; Ictrl-1) to each of the sensor electrode (120, 121), which has such sign and magnitude that a direct-current voltage level at the sensor electrodes (120, 121) relative areference potential is controled towards a predetermined voltage (DCset).

REFERENCES:
patent: 4612806 (1986-09-01), Feller
patent: 4616509 (1986-10-01), Feller
patent: 5392657 (1995-02-01), Feller
patent: 6431011 (2002-08-01), Feller
patent: 2002/0050175 (2002-05-01), Feller
patent: 2002/0145417 (2002-10-01), Brockhaus
patent: 2003/0005777 (2003-01-01), Budmiger
patent: 60-237321 (1985-11-01), None

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