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Optical fluid contamination and change monitor

  • US 3,936,192 A
  • Filed: 04/19/1973
  • Issued: 02/03/1976
  • Est. Priority Date: 08/05/1969
  • Status: Expired due to Term
First Claim
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1. Apparatus for testing a sample of fluid material to determine at least one characteristic correlated to the effect the material has on light comprising a sealed chamber for containing therein a fluid sample to be tested and having inlet and outlet openings thereto for the fluid sample to be tested;

  • a light source mounted exteriorly of said chamber, means responsive to light for producing a signal mounted exteriorly of said chamber;

    first optical fiber means extending from within said chamber to said light source;

    second optical fiber means extending from within said chamber to said light responsive means, a rotor mounted for rotation about an axis within said chamber;

    said rotor having at least two through passages, each extending between the chamber ends of said optical fiber means in spaced-apart positions of said rotor;

    a reference material in one or more of said passages, and means in other of said passages for holding a sample material;

    second light responsive means;

    third optical fiber means extending from within said chamber to said second light responsive means and having an off-axis orientation with respect to said first and second optical passages in said rotor providing respective light paths for each of said through passages with said third optical fiber means.

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