Soot detector for engine oil
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United States of America Patent
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-
May 10, 2005
Grant Date -
Mar 17, 2005
app pub date -
Aug 27, 2003
filing date -
Aug 27, 2003
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus for detecting the concentration of soot particles in engine oil. A microwave signal having a varying frequency is applied to a transmission line having a probe tip exposed to the engine oil. A voltage is read at a stationary detection point along the length of the transmission line for each applied frequency. The applied frequency when the probe voltage is equal to a null voltage of a standing wave within the transmission line is compared to a reference frequency determined when the probe voltage is equal to a null voltage for a known concentration of soot particles. The concentration is calculated based upon the result of the comparison. Preferably, a reference probe receives the same input signal. A known relationship between the reference probe and the transmission line is then used to eliminate temperature effects on the applied frequency.
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