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Fluid quality control using broad spectrum impedance spectroscopy

  • US 20060214671A1
  • Filed: 05/02/2006
  • Published: 09/28/2006
  • Est. Priority Date: 02/16/2004
  • Status: Active Grant
First Claim
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1. A fluid property quality control method, comprising the steps of:

  • a) obtaining a set of calibration fluids representative of a manufacturing process;

    b) performing impedance measurements on each of the calibration fluids to obtain first impedance spectroscopy (IS) data, wherein the first IS data include data for at least three frequencies;

    c) using an at least one statistical technique to analyze the first IS data providing first IS signatures indicative of properties for each of the calibration fluids;

    d) performing impedance measurements on a test fluid providing second IS data, wherein the second IS data include data for at least three frequencies;

    e) using the at least one statistical technique to analyze the second IS data providing second IS signatures indicative of properties of the test fluid;

    f) comparing the first IS signatures and the second IS signatures providing quality control information relating to the properties of the test fluid; and

    g) modifying the manufacturing process responsive to the quality control information;

    wherein the at least one statistical technique includes at least one of the following statistical techniques;

    Principal Component Analysis, Multivariate Least Squares Regression, Principal Component Regression, Pattern Recognition analysis, Cluster analysis, Neural Net analysis, and Group Methods of Data Handling.

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