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Passenger inspection system and methods for using the same

  • US 7,750,631 B2
  • Filed: 06/22/2007
  • Issued: 07/06/2010
  • Est. Priority Date: 06/22/2007
  • Status: Active Grant
First Claim
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1. A method for detecting a weapon in at least one of a first shoe and a second shoe worn by a person, the method comprising:

  • positioning the first shoe and the second shoe within an inspection system comprising a first metal detector trace and a second metal detector trace, the first metal detector trace mounted substantially horizontally on a first sidewall of the inspection system with current that flows in a first direction, and the second metal detector trace mounted substantially horizontally on a second sidewall of the inspection system opposite the first sidewall with current that flows in a second direction;

    generating at a predetermined quadrupole resonance frequency a first magnetic field around the first shoe by energizing the first metal detector trace to scan the first shoe;

    simultaneously generating at the predetermined quadrupole frequency a second magnetic field around the second shoe by energizing the second metal detector trace to scan the second shoe simultaneously with the first shoe;

    generating a quadrupole resonance current in at least one electrically conductive trace positioned below at least one of the first shoe and the second shoe; and

    detecting a perturbation in the quadrupole resonance current when a weapon is present on at least one side of a longitudinal medial plane that bisects the inspection system.

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