Method for compensating interference voltages in the electrode circuit in magnetic-inductive flow measurement
US4704908A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 20, 1986 |
| Grant date | Nov 10, 1987 |
| Priority date | — |
| Expiry date | Oct 20, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F1/60
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.