Solid state sensor element

Details Solid state sensor element Solid state sensor element

1986-01-21

1987-11-17

Tung, T.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204 1T, 733365, 73336, G01N 2746

Patent

active

047072440

ABSTRACT:
A solid state sensing element comprising a nonporous, structurally stable, electrically insulating substrate on which is disposed spaced apart pairs of electrodes for contact with moisture. A hygroscopic electrolytic material is located in close proximity to the electrodes as by coating the electrodes with the hygroscopic material. A catalyst is deposited in close proximity to the electrodes and is electrically insulated therefom. The electrodes are connected to a source of potential and current measuring instrumentation. Moisture is trapped by the hygroscopic material and electrolyzed at the electrodes. The catalyst recombines the hydrogen and oxygen thus formed to water so there is no net consumption of water by the element and equilibrium is established at the sensor surface and the atmosphere adjacent the sensor surface. Any change in partial pressure in the atmosphere adjacent the sensor surface is reflected by the movement of water molecules to the area of least concentration which produces a change in amount of moisture being electrolyzed and an increase or decrease in the current required by the element to electrolyze water.

REFERENCES:
patent: 2238903 (1941-04-01), Lieneweg
patent: 3001918 (1961-09-01), Czuha
patent: 3232851 (1966-02-01), Haber et al.
patent: 3954590 (1976-05-01), Czuha
patent: 3981785 (1976-09-01), Sandler
patent: 4280885 (1981-07-01), Savery
patent: 4307373 (1981-12-01), Johnston
patent: 4343688 (1982-08-01), Harwood
Clayton, "Moisture & Humidity, Measurement & Control in Science & Industry", pp. 535-544, ISA (1985).
Rochinsky, "Moisture & Humidity, Measurement & Control in Science & Industry", pp. 699-706, ISA (1985).

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