Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1986-10-20
1987-11-10
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
G01F 158
Patent
active
047049081
ABSTRACT:
In magnetic-inductive flow measurement with periodically reverse-poled DC magnetic field (with or without field-free phases) the signal voltage in each half period is sampled during a measuring signal sampling interval and the signal value obtained by the sampling is stored. For compensating an interference DC voltage superimposed on the measuring signal in a compensation interval following each measuring signal sampling interval within the same half period by sampling and storing the signal voltage a compensation voltage is generated which compensates the signal voltage within the compensation interval to the value zero. The compensation voltage is stored and superimposed on the signal voltage until the next compensation interval. During a correction sampling interval following each compensation interval within the same half period the signal voltage is again sampled and the signal value thereby obtained also stored. To recover a useful signal value firstly the difference is formed between the stored signal values obtained between two compensation intervals in different half periods and then the differences formed between two difference values obtained in this manner.
REFERENCES:
patent: 4210022 (1980-07-01), Boss
patent: 4382387 (1983-05-01), Hafner
patent: 4651286 (1987-03-01), Fukai et al.
JP-Patents Abstracts of Japan, vol. 4, No. 172, Nov. 27, 1980, No. 55-116220.
Flowtec AG
Ruehl Charles A.
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