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Method and apparatus for comparing spectra

  • US 5,308,982 A
  • Filed: 10/05/1992
  • Issued: 05/03/1994
  • Est. Priority Date: 10/04/1991
  • Status: Expired due to Term
First Claim
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1. A method for determining concentration of a selected analyte in a sample, the analyte having a characteristic spectral band in a selected spectral region within a range consisting of infrared, visible and ultraviolet radiation, the method comprising:

  • generating an analyte spectrum of a selected analyte including the spectral band;

    generating a sample spectrum of a sample for the selected spectral region;

    computing a first derivative of the sample spectrum;

    constructing a matrix model comprising as components the analyte spectrum and the first derivative of the sample spectrum; and

    applying the matrix model to the sample spectrum so as to yield a parameter representing concentration of the selected analyte in the sample.

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