Humidity sensor

Details Humidity sensor Humidity sensor

1973-12-13

1976-06-01

Albritton, C. L.

Electrical resistors

Resistance value responsive to a condition

Gas, vapor, or moisture absorbing or collecting

200 6106, H01C 1300

Patent

active

039613011

ABSTRACT:
The operation of relative humidity sensors made from cobalt oxide on a non-conductive ceramic substrate is improved by (1) providing a porous, sputtered overcoat of polytetrafluoroethylene which renders the sensor surface non-wettable without affecting other properties, and (2) providing a printed heating element on the back surface of the sensor, enabling in situ degassing of chemisorbed or adsorbed impurities and regeneration of a nascent sensor surface.

REFERENCES:
patent: 2083732 (1937-06-01), Moore et al.
patent: 2543384 (1951-02-01), Squier
patent: 2806991 (1957-09-01), White
patent: 2979828 (1961-04-01), Westeren
patent: 3345496 (1967-10-01), DeLaney et al.
patent: 3478191 (1969-11-01), Johnson et al.
patent: 3479257 (1969-11-01), Shaver
patent: 3496336 (1970-02-01), Hingorany et al.
patent: 3715702 (1973-02-01), Nicholas
patent: 3868492 (1975-02-01), Taylor

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