Capacitive pressure transducer

Details Capacitive pressure transducer Capacitive pressure transducer

1983-12-19

1984-12-25

Griffin, Donald A.

Electricity: electrical systems and devices

Electrostatic capacitors

Variable

73718, H01G 700, G01L 912

Patent

active

044907737

ABSTRACT:
The flexible membrane for sensing a differential pressure in a cylindrical sensor is made from a tube with heavy end rings that gradually taper down to form a flexible membrane such that stresses from membrane flexions are distributed throughout the end rings to prevent the stresses from being transmitted to the joints between the tube and its supporting structure thereby reducing hysteresis and creep deformation effects; temperature and stray capacitance effects are minimized by using the capacitive sensor in a tank circuit having an inductor integral to the transducer structure, the tank circuit oscillating at its resonant frequency for use in indicating the differential pressure.

REFERENCES:
patent: 3405559 (1968-10-01), Moffatt
patent: 3479879 (1969-11-01), Music
patent: 4064549 (1977-12-01), Cretzler
patent: 4389895 (1983-06-01), Rud

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