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System for identifying materials by NIR spectrometry

  • US 5,822,219 A
  • Filed: 05/13/1996
  • Issued: 10/13/1998
  • Est. Priority Date: 05/13/1996
  • Status: Expired due to Term
First Claim
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1. A method of matching an unknown product with one of a library of known products comprising the following steps:

  • step (1);

    measuring a near infrared absorbance spectrum for each of said known products,step (2);

    generating known product vectors extending into hyperspace representing the absorbance spectra determined for each of said known products,step (3);

    dividing said known product vectors into clusters of vectors extending into hyperspace wherein the end points of the vectors of each cluster are closer to each other in hyperspace than the vectors outside of such cluster,step (4);

    dividing at least some of said clusters of vectors into subclusters of vectors extending into hyperspace,step (5);

    repeating said step (4) on at least some of said subclusters until all of said subclusters have fewer than a predetermined number of vectors,step (6);

    surrounding the end points of the vectors of each of said clusters and subclusters with an envelope defined in the corresponding hyperspace,step (7);

    measuring the absorption spectrum of said unknown product,step (8);

    determining in which of said envelopes surrounding said clusters divided in step (3) the end points of a vector, representing said unknown product and extending into the hyperspace of said clusters, falls,step (9);

    if the end point of a vector representing said unknown product falls into an envelope surrounding a cluster which is divided into subclusters, then determining in which envelope surrounding a subcluster the end point of a vector representing said unknown product and extending into the hyperspace of such subcluster, falls,step (10);

    repeating the step (9) on further divided subclusters until a vector representing said unknown product is determined to fall into an envelope surrounding a subcluster which is not further divided,step (11);

    then determining which known product represented by a vector within said last-named envelope said unknown product matches.

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