Capacitive force-measuring system
US4051721A · kind A · utility
21Cited by
4References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 13, 1976 |
| Grant date | Oct 4, 1977 |
| Priority date | — |
| Expiry date | Jan 13, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L1/144
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An applied force whose mangitude is to be measured is caused to change the spacing between a pair of conductive plates. The resulting variation in capacitance between the plates is employed in an RC oscillator circuit so as to produce a frequency that is reciprocally related to the capacitance. A neutralizing circuit serves to cancel the effect of stray capacitance, and a digital counting device converts the oscillator frequency to a scaled number indicating the magnitude of the applied force.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.