Hygrometer

Details Hygrometer Hygrometer

1977-01-17

1978-04-11

Queisser, Richard C.

Measuring and testing

Gas analysis

Moisture content or vapor pressure

73 17A, G01N 2568

Patent

active

040832490

ABSTRACT:
A supersaturation hygrometer formed by a thermo-optical servo system which esponds to water vapor changes in the range just above and below water saturation. The system includes a hydrophobic metal chip on which monodisperse submicron salt particles act as centers of water condensation. A change in scattered light from the solution droplets on the chip drives an infrared source which heats the chip to keep the size of the droplets constant. The infrared power is related to the chip ambient temperature difference which is proportional to the ambient water vapor pressure.

REFERENCES:
patent: 2415776 (1947-02-01), Walton
patent: 2492768 (1949-12-01), Schaeffer
patent: 3166928 (1965-01-01), Jackson
patent: 3269185 (1966-08-01), Francisco
patent: 3388863 (1968-06-01), Andersen et al.
patent: 3465591 (1969-09-01), Bachem et al.
patent: 3661724 (1972-05-01), Strickler
patent: 3664192 (1972-05-01), Campbell et al.

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