Measuring and testing – Fluid pressure gauge – With pressure and/or temperature compensation
Patent
1988-02-01
1989-02-28
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
With pressure and/or temperature compensation
G01L 912, G01L 1904
Patent
active
048074772
ABSTRACT:
The undesired temperature variation of a capacitive pressure sensing element (10) having a positive temperature coefficient of capacitance (TCC) is compensated by a series resistor R and compensating capacitor (C.sub.c) connected in parallel to the pressure sensing capacitor (C.sub.x). The compensating capacitor and presssure sensing element have opposite polarity temperature coefficients of capacitance, and the magnitude of the resistor is selected such that its resistive impedance is nonnegligible and is comparable to the magnitude of the capacitive reactance of the pressure sensing capacitor or compensating capacitor at a predetermined operative frequency of an electrical signal applied to and/or determined by the pressure sensing and compensating capacitors.
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Myers Donald O.
Stamm Gregory D.
Melamed Phillip H.
Motorola Inc.
Woodiel Donald O.
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