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Tunable Quantum Cascade Lasers and Photoacoustic Detection of Trace Gases, TNT, TATP and Precursors Acetone and Hydrogen Peroxide

  • US 20110102788A1
  • Filed: 11/01/2010
  • Published: 05/05/2011
  • Est. Priority Date: 06/23/2006
  • Status: Abandoned Application
First Claim
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1. A method for more quickly determining the presence of a target gas, the steps comprising:

  • 1) Identifying and selecting regions in a frequency range of a selectable wavelength light source which meets all the following criteria;

    a) the target gas has large absorption in at least some frequencies in said frequency range;

    b) expected interferents have low absorption at their expected concentrations; and

    c) a detectable signature of target gas is linearly independent of signature of interferents;

    2) collecting a sample of gas for testing of the target gas;

    3) Perform a scan across said identified and selected regions and collecting photoacoustic data from said scan; and

    4) Linearly deconvolving said photoacoustic data against a standardized library of the target gas and list of expected interferents, to obtain a gas concentration measurement for the target gas.

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