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Photoacoustic spectroscopy system and technique for remote sensing of explosives and toxic chemicals

  • US 20080180675A1
  • Filed: 01/29/2007
  • Published: 07/31/2008
  • Est. Priority Date: 01/29/2007
  • Status: Active Grant
First Claim
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1. A photoacoustic spectroscopy (PAS) system for remote sensing of explosives, toxic chemicals, and biological agents, or other material, comprising:

  • a tunable laser for transmitting optical energy comprising laser pulses at a selected frequency to a remote target comprising explosives, toxic chemicals, biological agents, or other material, and causing acoustic signals to be emitted from the target;

    a pulse generator comprising a chopper operating at a frequency selected on the basis of background noise for generating pulses to said tunable laser;

    a sensor for detecting acoustical signals from the target;

    a reflector for receiving acoustic signals from the target and focusing the acoustic signals to a focal area comprising said sensor;

    a resonator for reducing acoustic interference and amplifying the acoustic signals; and

    data acquisition and analysis equipment operatively connected and cooperating with said sensor, reflector, resonator, tunable laser, and pulse generator, for determining information about the target.

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