Measuring and testing – Fluid pressure gauge – Diaphragm
Patent
1988-04-19
1989-10-31
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Diaphragm
73724, 331 65, G01L 912
Patent
active
048768928
ABSTRACT:
A pressure sensor includes a variable capacitor responsive to an applied fluid pressure to predictably change capacitance value. A tuned oscillator circuit having an inductive impedance includes the variable capicitor and simulates a resonant inductive-capacitive circuit not including an inductor. The tuned circuit oscillator to provide a signal with a period which is a function of the variable capacitance value, and of the applied fluid pressure. Additional elements are provided for precise measurement of the variable signal, correction for temperature effects, correction of measurement aberrations, and production of an output signal in a preferred format.
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Arabia F. Gene
Brandt Randy L.
Shkedi Zvi
Allied-Signal Inc.
McFarland James W.
Miller Terry L.
Woodiel Donald O.
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