Capacitance measuring system
US4054833A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 11, 1976 |
| Grant date | Oct 18, 1977 |
| Priority date | — |
| Expiry date | Jun 11, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24149
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system for generating a signal which is a predetermined function of the capacitance of a sensor capacitor. The system comprises a sensing network including two series capacitors, at least one being the sensor capacitor. The system further comprises a switching network, and a feedback network coupled to the sensing and switching networks. The feedback network generates a feedback signal representative of the difference in charge stored on the series capacitors from a predetermined value. The switching network cyclically interconnects the feedback and sensor networks with the feedback signal and externally applied reference potentials whereby the average charge stored on the series capacitors over each cycle is substantially equal to the predetermined value. In some embodiments, the feedback signal is a linear function of the reciprocal of capacitance of the sensor capacitor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.