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Security system and method

  • US 6,057,761 A
  • Filed: 01/21/1998
  • Issued: 05/02/2000
  • Est. Priority Date: 01/21/1997
  • Status: Expired due to Term
First Claim
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1. A security system for contraband detection comprising:

  • a portal defining an interrogation region therewithin into which region a screening target may be introduced;

    a transmitter/receiver array mounted in a defined at least partial perimeter around said region for illuminating the target by a first microwave beam and for monitoring the dielectric response to said first microwave beam to produce a dielectric response signal representative of the dielectric response of the target to microwave illumination; and

    electronics operatively connected with said transmitter/receiver array for energizing said array in accordance with defined microwave energy amplitude and timing characteristics and for monitoring said dielectric response signal, said electronics including a discriminator for comparing said dielectric response signal with a defined characteristic response signal, said electronics producing an indication of a difference therebetween meeting predefined criteria.

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