Pressure transducer
US4422335A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 1981 |
| Grant date | Dec 27, 1983 |
| Priority date | — |
| Expiry date | Mar 25, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L9/0086
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A pressure transducer (26) is disclosed. A multiplicity of signal plates (Cs, Cr, Csf, Crf) are disposed on a first quartz disc (88). Opposing the signal plates (Cs, Cr, Csf, Crf) across a gap formed by an annular frit (92) is a common plate (94) disposed on a second quartz disc (86). The signal plates (Cs, Cr, Csf, Crf) and common plate (94) form capacitors which are operable to modulate alternating excitation signals applied to the signal plates. The capacitances vary the modulation during deflections of the discs (86, 88) as a result of pressure changes, and the common plate (94) algebraically sums the modulated excitation signals into a single output from the transducer (26).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.