Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Reexamination Certificate
2005-05-10
2005-05-10
Nolan, Jr., Charles H. (Department: 2854)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
C324S643000
Reexamination Certificate
active
06891383
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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Nagy Louis L.
Nicholson Warren Baxter
Delphi Technologies Inc.
Funke Jimmy L.
Nolan, Jr. Charles H.
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