Process for contactless measurement of the electrical resistance of a test material
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United States of America Patent
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May 11, 1993
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N/A
app pub date -
Apr 11, 1991
filing date -
Apr 11, 1990
priority date (Note) -
Expired
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Abstract
Process for contactless measurement of the electrical resistance (or of the electrical conductivity) of a preferably flat material (test material) in which an alternating current is capacitively coupled into the test material with the help of two coupling electrodes. The total impedance is measured at at least three different frequencies, and from that measurement, the stray capacitance between the two coupling electrodes, the coupling capacitance between the two coupling electrodes and the test material, as well as the resistance of the test material are determined. In a preferred embodiment the process is used for controlling the windshield wipers of a motor vehicle.
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