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Determining the quantity of a taggant in a liquid sample

  • US 9,995,681 B2
  • Filed: 07/24/2015
  • Issued: 06/12/2018
  • Est. Priority Date: 09/28/2010
  • Status: Active Grant
First Claim
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1. A liquid sample analysis method comprising;

  • providing an excitation light and a broadband light to a liquid sample;

    obtaining, by a fluorescence spectrometer, measured emission pre-spectrum from the liquid sample;

    storing the measured emission pre-spectrum in a memory;

    determining a peak of the measured emission pre-spectrum, wherein the peak comprises a first intensity;

    adjusting, when the first intensity is outside a desired range, an integration time to produce a measured emission spectrum of intensity versus wavelength;

    generating a predicted concentration of a fluorescent tagging compound in the liquid sample using the measured emission spectrum;

    comparing the predicted concentration of the fluorescent tagging compound in the liquid sample to a preset concentration of the fluorescent tagging compound in the liquid sample; and

    determining whether the measured emission spectrum is a member of a class for a sub-model based on spectral fitness metrics,wherein the spectral fitness metrics comprise a spectrum fit based on the measured emission spectrum, a matrix of spectrum weights, and a matrix of spectrum loadings.

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