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Method and apparatus for the debris particulate characterization in lubricants

  • US 6,949,936 B2
  • Filed: 02/16/2001
  • Issued: 09/27/2005
  • Est. Priority Date: 02/16/2000
  • Status: Expired due to Fees
First Claim
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1. A method for measuring a particulate characteristic of a fluid, said method comprising:

  • applying an electrical signal at each of a plurality of frequencies in a frequency range to a fluid, wherein the frequency range includes a resonant frequency;

    measuring an impedance quantity characteristic of the fluid at each of the plurality of frequencies at a time t1;

    measuring at each of the plurality of frequencies the impedance quantity characteristic of the fluid at a time t2;

    deducing a change in a particulate characteristic of the fluid from the measured impedance quantity between t1 and t2; and

    correlating the change in the particulate characteristic of the fluid with a change in the fluid environment.

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