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Photoacoustic analyzer and method

  • US 5,616,826 A
  • Filed: 05/18/1995
  • Issued: 04/01/1997
  • Est. Priority Date: 06/04/1994
  • Status: Expired due to Fees
First Claim
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1. A photoacoustic analyzing method comprising the steps of:

  • passing a pulsating beam of light having a predetermined frequency in an infrared frequency portion through an analytic device comprising at least one reference chamber containing a gaseous reference medium and at least one measuring chamber containing a gaseous analysis medium so as to cause generation of sound within said reference chamber and within said measuring chamber;

    said gaseous analysis medium containing an unstable chemically reactive species of interest in an unknown concentration, and said gaseous reference consisting of an inert gaseous medium having photoacoustic absorption compatible with said unstable chemically reactive species and capable of serving as a photoacoustic reference for said gaseous analysis medium;

    separately detecting said sound generated in said at least one reference chamber and in said at least one measuring chamber to generate a first and a second signal in relation to said sound generated in said at least one reference chamber and in said measuring chamber; and

    evaluating said first and said second signals in relation with said unknown concentration of said species of interest.

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