Capacitor and pressure transducer
US5168419A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 16, 1991 |
| Grant date | Dec 1, 1992 |
| Priority date | — |
| Expiry date | Jul 16, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L9/003
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A dual capacitor device for utilizing dependent capacitances for measurement purposes where an upper capacitor base member and a lower capacitance base member are arranged with parallel capacitor surfaces in horizontal planes and where the parallel capacitor surfaces are located on opposite sides relative to a vertical axis to define first and second capacitors. The lower capacitor base member has a centrally located section connected to an outer section of the lower capacitor base member by a torsion beam and the centrally located section is attached to the upper capacitor base member by a vertical arm member. The torsion beam means has a displacement axis normal to the central axis so that angular displacement of the torsion beam and the centrally located section about the displacement axis produces a capacitance change in the first and second capacitors. A force moment applied to the centrally located section by a spirally wound bourdon tube in response to pressure develops a low force on the torsion beam which is less than the micro yield point of the torsion beam material and develops a micro dimensional angular displacement of the centrally located section and a capacitance c…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.