Apparatus and method for digitising impedance
US8890546B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 1, 2010 |
| Grant date | Nov 18, 2014 |
| Priority date | — |
| Expiry date | Jul 19, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/24
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for digitizing an impedance is provided that comprises a first impedance element having a first impedance that varies with a property to be measured and a second impedance element having a second impedance. The apparatus also includes a drive signal generator for applying a first alternating drive signal to the first impedance element and a second alternating drive signal to the second impedance element. An analog-to-digital converter, ADC, receives a resultant signal comprising the combination of the signals produced by the application of the first and second alternating drive signals to the first and second impedance elements. The first alternating drive signal is phase shifted relative to the second alternating drive signal such that the resultant signal received and sampled by the ADC sequentially relates to the sum of, and the difference between, the first and second impedances. The apparatus also comprises a signal separator that receives sample values from the ADC and generates a sum channel and a difference channel therefrom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.