Pressure transducer

Details Pressure transducer Pressure transducer

1974-11-04

1976-06-29

Woodiel, Donald O.

Measuring and testing

Gas analysis

Moisture content or vapor pressure

G01L 912

Patent

active

039657469

ABSTRACT:
A high precision pressure transducer utilizing a fluid-tight evacuated pressure capsule having a diaphragm forming the wall portion of the pressure capsule. Deflection of the diaphragm controls variations in an extremely small gap spacing between two associated pairs of capacitor plates positioned within the evacuated capsule. The variations in capacity of the two variable capacitors is used to electrically vary the frequency of an associated electrical oscillator. The sensitivity to deflections is very high, permitting relatively thick, very low deflection, very low stress diaphragms to be utilized, which in the substantially completely symmetrical mechanical and electrical arrangement of the pressure capsule produces extremely high stability and accuracy of operation.

REFERENCES:
patent: 2367866 (1945-01-01), Humphreys et al.
patent: 2714703 (1955-08-01), Ruderfer
patent: 3479879 (1969-11-01), Music
patent: 3859575 (1975-01-01), Lee et al.

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