Pressure ratio measurement system

Details Pressure ratio measurement system Pressure ratio measurement system

G - Physics

01

L

73/3, 354/30

G01L 9/12 (2006.01) G01L 15/00 (2006.01)

Patent

CA 1176866

ABSTRACT OF THE DISCLOSURE 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 capaci- tance are combined in a summing junction (36) whose output is an error signal (le) 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 (le) 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 capaci- tance (Csf). (Figure 2)

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