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Portal trace detection systems for detection of imbedded particles

  • US 6,840,122 B1
  • Filed: 02/06/2004
  • Issued: 01/11/2005
  • Est. Priority Date: 12/22/2000
  • Status: Expired due to Term
First Claim
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1. A method for enhancing detection of particles of interest in a portal detection system, said method comprising the steps of:

  • providing a portal having a plurality of sidewalls and a passage between the sidewalls, a ceiling connecting the sidewalls and disposed above the passage and a particle detection apparatus having an inlet in the ceiling and communicating with the passage for receiving air flowing adjacent to a human suspect in the passage; and

    directing a plurality of short puffs of air into the passage with sufficient velocity for dislodging particles of interest trapped in clothing of the human suspect in the passage.

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