Measuring and testing – Gas analysis – Moisture content or vapor pressure
Patent
1975-07-22
1979-08-21
Yasich, Daniel M.
Measuring and testing
Gas analysis
Moisture content or vapor pressure
361286, G01N 2564, H01G 700
Patent
active
041648684
ABSTRACT:
A capacitive humidity transducer wherein an electrically non-conductive base carries at least a pair of electrically conductive coatings which are spaced from each other. A dielectric film which is active with respect to water absorption is also carried by the base and covers at least portions of the coatings, the dielectric film having a dielectric constant the value of which varies as a function of the extent to which water has been absorbed by the dielectric film. An outer electrically conductive, water-permeable layer is carried by the dielectric film with this film being situated at least in part between the coatings and the layer while the latter because of its water permeability permits moisture in the atmosphere to reach the dielectric film. The dielectric film maintains the outer layer permanently out of contact with at least one of the coatings, so that it is possible to measure between these coatings a capacitance which will be indicative of atmospheric humidity.
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Vaisala Oy
Yasich Daniel M.
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