Pressure ratio measurement system
US4434664A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 6, 1981 |
| Grant date | Mar 6, 1984 |
| Priority date | — |
| Expiry date | Jul 6, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L15/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A pressure ratio measuring system is disclosed. The system includes two quartz capacitive pressure transducers (16, 22). Each capsule contains a pressure sensitive capacitor (Csa, Csf) which is fed by an alternating excitation signal. Capacitance (Csa) is fed by excitation signal (Vr) and Capacitance (Csf) is fed out of phase by feedback excitation signal (-Vr f(N)). The outputs of the capacitance are combined in a summing junction (36) whose output is an error signal (Ie) proportional to the pressure ratio. A feedback loop (26) is closed through a register (30) and a multiplying digital to analog converter (32) to generate the feedback signal (-Vr f(N)). The feedback loop (26) integrates the error signal (Ie) by incremental changing the feedback signal (-Vr f(N)) with digital number (N) in a direction to null the loop. When the loop is nulled the digital number (N) is a representation of the ratio (Pa/Pb) of the pressure (Pa) sensed by capacitance (Csf).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.