Proximity moisture sensor

Details Proximity moisture sensor Proximity moisture sensor

1984-12-17

1986-09-23

Shoop, Jr., William M.

Electricity: motive power systems

Automatic and/or with time-delay means

Moisture content or wetness

318442, 318443, 318444, 318DIG2, 307 10R, 307116, 307118, 250338, H02P 104, B60S 104

Patent

active

046138021

ABSTRACT:
A device for detecting the presence of water includes a capacitance sensor coupled to a windshield to detect capacitance changes. A multivibrator is coupled to the sensor to translate the detected capacitance change to the frequency domain. A phase-locked loop coupled to the multivibrator produces a phase pulse in response to water causing a change in capacitance and, in turn, a change in the frequency of the multivibrator.

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