Wetness sensor for a window of a motor vehicle

Details Wetness sensor for a window of a motor vehicle Wetness sensor for a window of a motor vehicle

1995-07-27

1997-09-30

Nguyen, Vinh P.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324689, 324687, 340602, 361286, 219203, G01R 2726

Patent

active

056729766

ABSTRACT:
In a wetness sensor for a window of a motor vehicle, a heating resistor arranged in the window and powered by DC current can be connected to a measuring device for measuring an AC impedance of the heating resistor, in particular the capacitive portion thereof. The impedance varies with the amount of wetness and, thereby, serves as a measure of the wetness. A capacitor is used to bring the sensor near resonance for improved sensitivity.

REFERENCES:
patent: 4127763 (1978-11-01), Roselli
patent: 4373392 (1983-02-01), Nagamoto
patent: 4820902 (1989-04-01), Gillery
patent: 5040411 (1991-08-01), Medzius

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