Measuring and testing – Fluid pressure gauge – With pressure and/or temperature compensation
Patent
1986-06-06
1989-01-17
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
With pressure and/or temperature compensation
73720, 73726, G01L 708, G01L 904, G01L 1904
Patent
active
047980931
ABSTRACT:
Disclosed is an apparatus for pressure sensor compensation. The invention is best suited for pressure sensors of the type which may be mounted about a flexible member such that the resistance of one or more strain gauge resistors mounted thereon changes as pressure is exerted upon the flexible member. The pressure sensing apparatus comprises a bridge resistor arrangement for sensing pressure, and bridge control circuitry, coupled to an input terminal of the bridge, for compensating temperature induced variances in the bridge by controlling the voltage at the input terminal. The bridge has at least a first strain gauge resistor mounted on the flexible member, and at least one output terminal having a voltage which changes as pressure is exerted upon the flexible member. The bridge control circuitry has an additional strain gauge resistor which is used to monitor the temperature of the first strain gauge resistor.
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Schematic Diagram for Motorola Part No. CA3260.
Crawford Robert J.
Moore John H.
Motorola Inc.
Woodiel Donald O.
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