Patent ID: 6057761
Filing Date: 2000-05-02
Classification: A61B,G01N,G01S,G01V

Abstract:
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; andelectronics 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.