Trielectrode capacitive pressure transducer

Details Trielectrode capacitive pressure transducer Trielectrode capacitive pressure transducer

1975-07-17

1976-04-06

Woodiel, Donald O.

Measuring and testing

Gas analysis

Moisture content or vapor pressure

317246, G01L 912

Patent

active

039481026

ABSTRACT:
A capacitive transducer and circuit especially suited for making measurements in a high-temperature environment. The transducer includes two capacitive electrodes and a shield electrode. As the temperature of the transducer rises, the resistance of the insulation between the capacitive electrode decreases and a resistive current attempts to interfere with the capacitive current between the capacitive electrodes. The shield electrode and the circuit coupled thereto reduces the resistive current in the transducer. A bridge-type circuit coupled to the transducer ignores the resistive current and measures only the capacitive current flowing between the capacitive electrodes.

REFERENCES:
patent: 3577883 (1971-05-01), Werner
patent: 3619742 (1971-11-01), Rud

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