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Automatic threat detection based on illumination by penetrating radiant energy

  • US 5,179,581 A
  • Filed: 06/04/1991
  • Issued: 01/12/1993
  • Est. Priority Date: 09/13/1989
  • Status: Expired due to Term
First Claim
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1. An improved imaging system comprising:

  • an illumination source comprising a flying spot of penetrating radiation;

    conveying means for transporting an object to be inspected through an inspection field swept by said flying spot of penetrating radiation;

    first radiation detecting means located to detect radiation passing through said object as the object is transported through said inspection field for developing a sequence of transmit signals representative of a sequence of transmitted radiation;

    processing means responsive to said sequence of transmit signals for determining whether or not said object is suitable for manual inspection, said processing means including;

    distribution means responsive to said sequence of transmit signals for determining transmit signal intensity distribution;

    means for comparing said transmit signal intensity distribution to a reference characteristic at each of a plurality of signal intensities; and

    alarm means for generating an alarm only if said transmit signal intensity distribution exceeds said reference characteristic for an intensity for which said characteristic is defined.

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