Relative humidity sensing apparatus
AssigneeA.I.R., Inc.
InventorsWilliam L. Reich, David B. Call
Life of this patent
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Abstract
A relative humidity sensor includes a printed circuit board having a central passageway therethrough and a dielectric film extending across the passageway with electrodes mounted on that portion of the film in the passageway so as to generate a capacitance which will vary directly with the amount of moisture content in the film.
Claims17
A humidity sensor comprising a support member having a substantially flat support surface and a passageway extending completely through said support member in a direction normal to said surface, said passageway being entirely surrounded by said support member;
- a pair of electrically conductive portions on said support member;
- a film of material traversing said passageway including means for securing said film to said support member;
- and
- electrode members disposed on said film including at least two capacitive electrode portions with said film interposed therebetween to define a capacitor between said electrode portions, said film being water permeable and having a dielectric constant which varies directly with the amount of moisture therein, and means for establishing electrical contact between said electrically conductive portions.
A humidity sensor comprising a support member having a substantially flat support surface and a central passageway extending completely through said support member in a direction normal to said surface:
- a film of material traversing said passageway including means for anchoring said film between said layers;
- and
- electrode members disposed on said film so as to be exposed to air flowing through said passageway including capacitive electrode portions with said film interposed therebetween to define a capacitor between said electrode portions, said film being water permeable and having a dielectric constant which varies directly with the amount of moisture therein, and means for electrically connecting said electrode members to said electrically conductive portions.
Dependencies are inferred from the claim text.