Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1981-04-16
1983-05-10
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
G01F 160
Patent
active
043823874
ABSTRACT:
A method of compensating interference DC voltages in the electrode circuit in magnetic-conductive flow measurement with periodically reversed DC magnetic field in which the useful signal is obtained by sampling and storing the signal voltage after each reversal of the magnetic field at opposite polarity values of the magnetic field during a sampling time interval and forming the difference of the stored sampled values, and wherein in a compensating time interval following each sampling time interval a compensation voltage is produced by sampling and storing the signal voltage, which compensation voltage is superimposed oppositely on the signal voltage for compensating the signal voltage within the compensation time interval to the value zero and is retained until the next compensation time interval, wherein each compensation time interval lies within the time interval corresponding to the switched-on magnetic field, in which also the preceding sampling time interval lies.
REFERENCES:
patent: 3316762 (1967-05-01), Westersten
patent: 3965738 (1976-06-01), Watanabe
patent: 4010644 (1977-03-01), Bonfig et al.
patent: 4210022 (1980-07-01), Boss
Baker Joseph J.
Ferguson Jr. Gerald J.
Flowtec AG
Ruehl Charles A.
Whitham C. Lamont
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