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Optical measuring method of expiration components

  • US 5,754,288 A
  • Filed: 08/08/1996
  • Issued: 05/19/1998
  • Est. Priority Date: 08/09/1995
  • Status: Expired due to Fees
First Claim
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1. An optical measuring method for expiration components, comprising the steps of:

  • previously selecting wavelengths having excellent correlations between component concentrations as well as nitrogen concentration and Raman spectral intensity values as measuring wavelengths being specific to said components as well as nitrogen as to respective said components to be measured as well as nitrogen;

    previously preparing a calibration curve as to Raman spectral intensity ratios of respective said components to nitrogen and concentrations as to respective said expiration components;

    irradiating an expiration specimen with Raman excitation light;

    measuring Raman spectra at said measuring wavelengths being previously selected as to said components to be measured as well as nitrogen for obtaining said Raman spectral intensity ratios of said components to said Raman spectral of intensity of nitrogen; and

    quantitatively analyzing said components on the basis of Raman spectral intensity values of said components.

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