Electrical measurement of oil quality
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United States of America Patent
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Oct 1, 2002
Grant Date -
N/A
app pub date -
May 4, 2000
filing date -
May 7, 1997
priority date (Note) -
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Abstract
Method and apparatus for measuring oil quality based on the permittivity of the oil comprising a capacitive or radiative sensor for exposure to the oil, and an oscillator circuit including the sensor, wherein the oscillator circuit comprises a LC or crystal oscillator which provides an output signal, the amplitude of which is dependent upon the lossiness of the Tan .delta. of the oil, and a measuring device that responds to the amplitude of the output signal as a measure of oil quality.
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