Measuring and testing – Fluid pressure gauge – Diaphragm
Patent
1992-05-04
1993-08-10
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Diaphragm
73724, 361283, G01L 912
Patent
active
052338754
ABSTRACT:
A stable pressure transducer system is disclosed. The transducer system includes a variable capacitor having conductive plates with one of the conductive plates being associated with a diaphragm variable under pressure changes to vary the capacitance of the variable capacitor. The system also includes a reference capacitor. Circuitry for applying signals to the pressure variable and the fixed reference capacitor is used to obtain outputs from each of the capacitors with the output from the variable capacitor varying in amplitude with its capacitance. Circuitry for differentially combining the outputs from the variable and fixed capacitors provides an output voltage indicating the pressure applied to the diaphragm. In order to stabilize the output of the transducer, an isolating capacitor having a capacitance value at least several times greater than the capacitance of the variable and reference capacitors is coupled in series with one or both of the variable and reference capacitors. Preferably two isolation capacitors are used, one in series with each of said variable and reference capacitors on either side thereof. However, in some cases a single isolating capacitor between a common output point of the variable and fixed capacitors and ground may be effective.
REFERENCES:
patent: 4272822 (1981-06-01), Yasuhara et al.
patent: 4398426 (1983-08-01), Park et al.
patent: 4425799 (1984-01-01), Park
patent: 4644798 (1987-02-01), Tamura et al.
patent: 4735098 (1988-04-01), Kavli et al.
patent: 4741214 (1988-05-01), Vidmantas
Ahmed Saleh U.
Obermeier Horst
Kavlico Corporation
Woodiel Donald O.
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