Measuring and testing – Fluid pressure gauge – With pressure and/or temperature compensation
Patent
1978-11-30
1981-09-15
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
With pressure and/or temperature compensation
73718, 73724, 73766, G01L 1904
Patent
active
042890357
ABSTRACT:
A compensation technique and network circuitry for a quad-diode demodulator and capacitive transducer combination is disclosed. The compensation method includes varying the amplitude of an alternating carrier frequency oppositely to the changes produced in that amplitude by the compensable errors in the demodulator and transducer. In one preferred embodiment ratiometric compensation and temperature compensation for the demodulator and any capacitive transducer is produced. In a second embodiment linearization and temperature compensation for the demodulator and a quartz capacitive transducer is provided.
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"A Diode-Quad Bridge Circuit for Use with Capacitance Transducers," by Harrison et al. Rev. Scientific Instrum., vol. 44, No. 10, Oct. 1973.
Marvin William A.
The Bendix Corporation
Wells Russel C.
Woodiel Donald O.
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