Method of compensating the interference DC voltages in the elect

Details Method of compensating the interference DC voltages in the elect Method of compensating the interference DC voltages in the elect

1981-09-21

1983-12-27

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

By measuring electrical or magnetic properties

G01F 160

Patent

active

044223374

ABSTRACT:
An arrangement for magnetic-inductive flow measurement of an electrically conductive liquid flowing in a conduit includes a magnetic field generator which generates a periodically reversed magnetic field passing through the conduit perpendicularly to the flow direction. In the conduit two electrodes are disposed. The voltage taken from the electrodes is applied to a measuring amplifier. Connected to the output of the measuring amplifier are two sample and hold circuits which are controlled by a control circuit in such a manner that they sample the output voltage of the measuring amplifier for equal induction values of opposite sign of the magnetic field and store the sampling values until the next sampling. A subtraction circuit forms the difference of the stored sampling values. In a control loop between the output and the input of the measuring amplifier there is a storing control circuit which in predetermined compensation time intervals forms a compensation voltage value regulating the output voltage of the measuring amplifier to zero. The compensation method resides in that 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: 4010644 (1977-03-01), Bonfig et al.
patent: 4210022 (1980-07-01), Boss

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