Porous membrane humidity sensor

Details Porous membrane humidity sensor Porous membrane humidity sensor

1979-09-19

1981-01-20

Yasich, Daniel M.

Measuring and testing

Gas analysis

Moisture content or vapor pressure

733365, 338 35, G01R 2700, G01W 111, H01L 4902

Patent

active

042455065

ABSTRACT:
An improved sensor which responds to varying relative humidity by a change in impedance does not fail at 95-100 percent relative humidity. A microporous glass membrane or irradiated-and-etched plastic membrane contains a salt in its pores and has conductive coatings on both surfaces and hydrophobic films on the conductive coatings. At high humidities the pore fills with water and forms a bulge on the end of the pore because water will not wet the hydrophobic film. With proper choice of the pore radius no salt solution spills out.

REFERENCES:
patent: 2526636 (1950-10-01), Colman
patent: 3440372 (1969-04-01), Cecil
patent: 3713921 (1973-01-01), Fleischer et al.
patent: 4083249 (1978-04-01), Gerber
Publication: "Electric Hygrometer" by W. H. Meiklejohn (Jul. 1958) Transactions of the AIEE, vol. 77, Part 1, TK 1A6.

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