Pressure ratio measurement system

Details Pressure ratio measurement system Pressure ratio measurement system

1981-07-06

1984-03-06

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

Null balance type

731174, 73718, G01L 912

Patent

active

044346646

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).

REFERENCES:
patent: 3237178 (1966-02-01), Valentine
patent: 4322977 (1982-04-01), Sell et al.

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