Accession Number : ADD003835

Title :   Temperature Compensated, High Resolution Pressure Transducer Based on Capacitance Change Principles.

Descriptive Note : Patent,


Personal Author(s) : Rice,John H

Report Date : 12 Apr 1977

Pagination or Media Count : 8

Abstract : The transducer includes a sealed pressure reference cavity closed at one end by a thick, stiff base plate and at the other by a perimeter-clamped, taut diaphragm. A variable capacitor stack is constructed on the base plate within the reference cavity and the diaphragm is exposed to pressure variations in an environment to which it is exposed. Changes in pressure produce diaphragm deflection measured by the variable capacity. A load piston centrally carried by the diaphragm in flush contact with an upper capacitor plate distributively transmits environmental pressures to the capacitor plates. The use of the load piston achieves a unusually high and stable output that varies linearly with the pressure variations. Also the load piston permits a temperature compensation needed for accuracy. (Author)

Descriptors :   *Patents, *Pressure transducers, *Variable capacitors, Capacitance, High resolution, Temperature, Pistons, Cavities

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE