Capacitive coupled moisture sensor

Details Capacitive coupled moisture sensor Capacitive coupled moisture sensor

1987-10-22

1989-02-14

Griffin, Donald A.

Electricity: electrical systems and devices

Electrostatic capacitors

Variable

733365, H01G 520, H01G 700

Patent

active

048050709

ABSTRACT:
A rain sensor for a windshield having two sets of electroconductive coatings on opposing major surfaces of the outer glass ply of a windshield. The first set of coatings on the outer major surface of the ply are electrically insulated from but in close proximity to each other. The second set of electroconductive coatings are positioned within the windshield between the glass plies and are electrically connected to a signal generator and receiver. Water contacting the outer surface of the glass ply changes the nature of an electrical signal passing through the first pair of electroconductive coatings. In response to the altered signal, a controller actuates a windshield wiper arrangement to clear the viewing area of the windshield.

REFERENCES:
patent: 3986110 (1976-10-01), Overall et al.
patent: 4164868 (1979-08-01), Suntola
patent: 4429343 (1984-01-01), Freud
patent: 4520341 (1985-05-01), Miyoshi et al.
patent: 4522060 (1985-06-01), Murata et al.
patent: 4639831 (1987-01-01), Iyoda

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