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Method of detecting soot in engine oil using microwaves

  • US 4,345,202 A
  • Filed: 12/19/1980
  • Issued: 08/17/1982
  • Est. Priority Date: 12/19/1980
  • Status: Expired due to Fees
First Claim
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1. A method of measuring the concentration of soot particles in engine oil substantially independently of the oil composition and non-soot contaminants comprising the steps ofcoupling X band energy into a sample of the oil whereby the wavelength of the energy in the oil is modified by the permittivity of the oil, andsensing the modified wavelength and determining therefrom a value representing the permittivity of the oil wherein the permittivity is a measure of the soot concentration and is substantially independent of non-soot contaminants and oil composition.

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