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Apparatus for detecting deterioration of engine oil

  • US 5,049,742 A
  • Filed: 11/16/1989
  • Issued: 09/17/1991
  • Est. Priority Date: 11/16/1989
  • Status: Expired due to Term
First Claim
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1. An apparatus for detecting the deterioration of an engine oil comprising:

  • light source means for projecting an infrared light beam upon the engine oil whose deterioration is to be detected;

    photodetecting means for receiving infrared light transmitted through said engine oil to generate a photoelectrically converted output signal, a center wavelength of said infrared light received by the light detecting means being set substantially to an infrared absorption peak wavelength of ester of nitric acid contained in the engine oil; and

    signal processing means for receiving said output signal from the photodetecting means to derive a signal representing the deterioration of the engine oil.

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