Liquid medium capacitive displacement sensor
US4624140A · kind A · utility
16Cited by
16References
42Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 30, 1984 |
| Grant date | Nov 25, 1986 |
| Priority date | — |
| Expiry date | Jul 30, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C9/20
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The inside surface of a conductive vessel (preferably spherical) with insulated adjacent segments is coated with a dielectric layer. The vessel is then partly filled with a conductive liquid-like material such as mercury having an upper surface which remains approximately horizontal irrespective of the inclination of the vessel. The capacitance between the segments and liquid varies as a function of the vessel's inclination. Vibration-induced surface action also produces varying capacitance which can be detected for seismometer applications and the like.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.