Resonant conductor measurement system and method
US8752416B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Oct 22, 2012 |
| Grant date | Jun 17, 2014 |
| Priority date | — |
| Expiry date | Oct 22, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N11/162
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of measuring properties of a fluid that uses a conductor electrically connected to a current source. A magnetic field is created about the conductor and the conductor is introduced into the fluid medium. A current waveform, having a frequency, is periodically passed through the conductor, so as to cause the conductor to move, due to force exerted on the conductor from interaction of the current and the magnetic field. The conductor movement is sensed, producing a sense signal that is amplified into an amplified sense signal. The phase relationship between the current waveform and the amplified sense signal is measured and the current waveform frequency is adjusted to create a phase lock loop. The frequency when the phase lock loop is in lock state is measured as the phase between the excitation and the measured sense signal is varied, and fluid properties are calculated from the measured frequencies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.