Measuring and testing – Fluid pressure gauge – Null balance type
Patent
1981-03-16
1984-07-03
Goldberg, Gerald
Measuring and testing
Fluid pressure gauge
Null balance type
73718, G01L 912
Patent
active
044571798
ABSTRACT:
A differential pressure measuring system is disclosed. The system includes two quartz capacitive pressure transducers (14, 16). Each capsule contains a pressure sensitive capacitor (Csa, Csb) and a relatively pressure invariable reference capacitor (Cra, Crb). The pressure sensitive capacitors (Csa, Csb) are excited by out-of-phase signals, (Vr, -Vr) which further excite the reference capacitors (Cra, Crb), out of phase, respectively. The outputs of all capacitors are combined in a summing junction (22) whose output controls the count of a digital integrator (34). A closed loop is formed by converting the output of the integrator (34) to a negative feedback signal (lf) which is applied to the summing junction (22) through a feedback capacitor (Cf). The integrator (34) incrementally changes the feedback signal (lf) in a direction to balance the loop. At this point the output of the integrator (34) is representative of the measured differential pressure.
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Antonazzi Frank J.
Bluish Joseph A.
Chapman, Jr. John E.
Decker Ken C.
Goldberg Gerald
Marvin William A.
The Bendix Corporation
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