Pressure measuring system

Details Pressure measuring system Pressure measuring system

G - Physics

01

D

354/80

G01D 3/06 (2006.01) G01L 9/00 (2006.01) G01L 9/12 (2006.01)

Patent

CA 1160348

ABSTRACT OF THE DISCLOSURE A digital pressure measuring system with nonlinear resolution is disclosed. The system includes a capacitive pressure transducer with a pressure variable sensing capacitor and a substantially invariable reference capacitor. The capacitors of the transducer are excited by out-of-phase signals and their outputs combined at a summing junction. The output of the summing junction controls the incrementation of a counter whose output is converted to a nonlinear negative feedback signal. A closed loop is formed by applying the feedback signal to the summing junction through a feedback capacitor. The counter is incremented in a direction to null the loop such that its output is representative of the measured pressure.

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