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METHOD AND APPARATUS FOR THE PHOTO-ACOUSTIC IDENTIFICATION AND QUANTIFICATION OF ANALYTE SPECIES IN A GASEOUS OR LIQUID MEDIUM

  • US 20110214481A1
  • Filed: 05/11/2011
  • Published: 09/08/2011
  • Est. Priority Date: 03/02/2010
  • Status: Active Grant
First Claim
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1. A system for identifying and quantifying one or more analyte species present in a gaseous or liquid medium, the system comprising:

  • a laser that emits a laser beam;

    a resonant optical cavity containing said medium and having at least two cavity mirrors, one of which is a cavity coupling mirror;

    mode matching optics configured to couple the laser beam to the cavity via the cavity coupling mirror;

    means for applying a periodic dither or modulation waveform to the optical frequency of the laser beam or to the laser itself to thereby induce modulation of the intracavity optical power; and

    a means for detecting, at the frequency of the applied dither or modulation waveform or harmonics thereof, a varying pressure of the medium within the cavity.

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