Method and device for inductive conductivity measurements of a fluid medium
US8456178B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 13, 2011 |
| Grant date | Jun 4, 2013 |
| Priority date | — |
| Expiry date | Jan 7, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/023
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Exemplary embodiments of the present invention include methods and devices for the electromagnetic (inductive) measurement of the conductivity of liquids by immersing a sensor into the liquid, wherein the sensor includes at least 2 toroidal cores, one of said cores carrying an excitation coil and the other core carrying an induction coil. Exemplary methods include converting the induced current at the induction coil into an alternating square-wave voltage, followed by rectification. A sample-hold circuit may be employed to avoid the transition time of the alternating square-wave current conversion. The demodulated DC voltage is proportional to the conductivity of the measured liquid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.