Variable reactance position detector
US6486683B1 · kind B1 · utility
7Cited by
4References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 30, 1999 |
| Grant date | Nov 26, 2002 |
| Priority date | — |
| Expiry date | Dec 30, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R29/26
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A position sensor comprises a capacitive transducer and an inductor connected in series with the transducer. The transducer is a differential capacitor whose total admittance is essentially independent of changes in the sensed position. The total capacitance and inductance resonate at the fundamental frequency of a generator that provides a drive voltage and the resulting voltage across the sensor is thus substantially greater than the drive voltage. This increases the current through the transducer, and consequently increases the sensitivity of the sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.