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Method and apparatus for chemical analysis

  • US 5,348,003 A
  • Filed: 09/03/1992
  • Issued: 09/20/1994
  • Est. Priority Date: 09/03/1992
  • Status: Expired due to Fees
First Claim
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1. The method of determining a measure of absorbance of electromagnetic energy per unit path length by chemical species within a medium that scatters and absorbs electromagnetic energy, comprising the steps ofirradiating the medium with electromagnetic energy containing at least two components of different frequency, at least one of which is amplitude modulated;

  • detecting electromagnetic energy emerging from said medium;

    measuring the intensity of the detected energy at each of said frequencies and comparing it to a measure of the irradiating intensity at each of said frequencies to provide a measure of absorbance of said energy at said different frequencies;

    determining from said at least one amplitude modulated component of the electromagnetic energy information relating to the path length travelled by said component; and

    deducing, from the measure of absorbance and the information relating to the path length travelled, a measure of absorbance per unit path length travelled by the radiation for each of said frequencies.

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