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High sensitivity coherent photothermal interferometric system and method for chemical detection

  • US 7,502,118 B2
  • Filed: 02/21/2007
  • Issued: 03/10/2009
  • Est. Priority Date: 09/22/2003
  • Status: Expired due to Fees
First Claim
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1. A photo-thermal interferometric spectroscopy system that provides information about a chemical at a remote location, comprising:

  • a light detector system positioned remote from the chemical, the detector system having two inputs;

    a first input receiving a light signal from a local oscillator and a second input receiving a light beam passed through the chemical, an adaptive optics unit to at least partially compensate the light beam degradation caused by atmospheric turbulence in the light beam passed through the chemical, wherein the detector system includes a digital signal processing unit to recover information about at least one of absorption spectrum and concentration of the chemical.

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