Method for the measurment of capacitance, with application to linear measurement of distance
US5189376A · kind A · utility
7Cited by
13References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 17, 1990 |
| Grant date | Feb 23, 1993 |
| Priority date | — |
| Expiry date | Dec 17, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/2403
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A technique for measuring capacitance and displacement, in which two circuits are combined, one that produces a current proportional to capacitance, and another that integrates that current between two reference levels, and supplies an output proportional to the integration time. In preferred embodiments, the first circuit is a capacitive pump circuit, and the second circuit a dual-slope integrator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.