Differential windshield capacitive moisture sensors

Details Differential windshield capacitive moisture sensors Differential windshield capacitive moisture sensors

1997-01-10

1998-09-01

Williams, Hezron E.

Measuring and testing

Meteorology

Precipitation

G01N 100

Patent

active

058013075

ABSTRACT:
A differential capacitive moisture sensor, relying for its operation on the time-varying couplings in two moisture-sensing regions to provide indication of presence of moisture, with selectivity of sensing surface provided by a shielding electrode, and with temperature information provided by a simultaneously-fabricated resistive temperature sensor. Various electrode connections and sensor electronics may be used. An improved differential capacitive moisture sensor has equal dry capacitances, with unequal moisture sensitivities, for providing a single-polarity output signal. An ice detection method and apparatus is also provided.

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