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Method and apparatus for monitoring wear particles in a liquid medium

  • US 4,500,839 A
  • Filed: 07/09/1982
  • Issued: 02/19/1985
  • Est. Priority Date: 07/09/1981
  • Status: Expired due to Term
First Claim
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1. A method of monitoring one of magnetically polarized, magnetically polarizable, electrically polarized and electrically polarizable particles carried in a liquid medium and comprising the steps of:

  • impinging a flow of the liquid medium onto an upper surface of a substrate located in a magnetic or electric force field respectively, having a component extending substantially at right angles to the surface for attracting the particles thereonto;

    rotating the substrate about an axis which passes through the substrate and is disposed substantially parallel to the force field, the force field remaining fixed with respect to the substrate during said rotation instead of having relative motion between the two during the rotation of said rotating substrate, and said rotation being at an angular speed sufficient to modify the flow of the medium across the surface and permit the force field to precipitate the particles onto the surface; and

    monitoring optically the precipitated particles.

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