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Metal detector coil

  • US 4,866,424 A
  • Filed: 01/11/1988
  • Issued: 09/12/1989
  • Est. Priority Date: 01/11/1988
  • Status: Expired due to Fees
First Claim
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1. A walk-through, person-screening metal detector comprising bistatic coil means in a portal with transmitting coil means on one side and receiving coil means on the opposite side of the portal, said transmitting coil means being multiple coils and having changeable interconnection means for changing a field pattern in local regions of the portal to compensate for the effects of adjacent metal near t portal, and with gaps between adjacent parts of said multiple coils for adjustably controlling sensitivity variations within a volume contained by the receiving coil means disposed on said portal to intercept a field induced in a contraband item by the transmit coil means, detector means coupled to said coils, and alarm means responsive to said detector means for reporting contraband metal passing the portal.

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