Relative humidity measurement

Details Relative humidity measurement Relative humidity measurement

1979-09-24

1980-10-14

Woodiel, Donald O.

Measuring and testing

Gas analysis

Moisture content or vapor pressure

73 17A, 73 29, 338 35, G01N 3100

Patent

active

042274117

ABSTRACT:
A relative humidity measuring instrument includes two spaced electrodes on an insulating substrate which is mounted on a Peltier-effect thermoelectric module. When the substrate is cooled by the thermoelectric module, a comparator connected to the electrodes on the substrate detects a decrease in resistance between said electrodes due to condensation of moisture therebetween. Then a microcomputer receptive to temperature signals from a thermometer on the substrate and an ambient thermometer computes the relative humidity.

REFERENCES:
patent: 3204418 (1965-09-01), Mathews
patent: 3319457 (1967-05-01), Leone
patent: 3864659 (1975-02-01), Furuuchi et al.
patent: 3902040 (1975-08-01), Ikeda et al.
patent: 4052691 (1977-10-01), Nagano et al.

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