Method for determining and/or monitoring at least one physical, process variable of a medium
US9109997B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 22, 2010 |
| Grant date | Aug 18, 2015 |
| Priority date | — |
| Expiry date | Nov 15, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/0427
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for determining and/or monitoring at least one physical, process variable of a medium with an oscillatable unit, wherein the oscillatable unit is excited by means of a frequency search sweep within a predetermined frequency band in the working range of the oscillatable unit in the form of transmitted signals successively to oscillate with discrete exciter frequencies wherein the corresponding oscillations of the oscillatable unit are received in the form of received signals, wherein, via the frequency search sweep, the exciter frequency is ascertained, in the case of which the oscillatable unit oscillates with an oscillation frequency, which has a predetermined phase shift between the transmitted signal and the received signal. The transmitting/receiving unit excites the oscillatable unit to oscillate with the ascertained oscillation frequency. The selected points in time depend on the predetermined phase shift between transmitted signal and received signal and that the voltage values sampled at the discrete exciter frequencies of the received signal are evaluated with reference to their amplitude.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.