Temperature compensated, high resolution pressure transducer bas

Details Temperature compensated, high resolution pressure transducer bas Temperature compensated, high resolution pressure transducer bas

1976-07-19

1977-04-12

Woodiel, Donald O.

Measuring and testing

Gas analysis

Moisture content or vapor pressure

73 88E, 73406, 361283, G01L 912

Patent

active

040167640

ABSTRACT:
The transducer includes a sealed pressure reference cavity closed at one 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.

REFERENCES:
patent: 2576488 (1951-11-01), Stovall, Jr. et al.
patent: 3280628 (1966-10-01), Schloss
patent: 3529468 (1970-09-01), Carlson

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