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Method and apparatus for metal detection employing digital signal processing

  • US 7,432,715 B2
  • Filed: 08/26/2005
  • Issued: 10/07/2008
  • Est. Priority Date: 08/26/2004
  • Status: Active Grant
First Claim
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1. A metal detector of the continuous wave type including;

  • a transmission circuit and a transmitter coil adapted to produce an interrogating magnetic field for detection of a target;

    a receiving coil and a receiving circuit adapted to receive and process a receive signal produced by a target and its environment in the interrogating field;

    further including at least one digital signal generator adapted to generate at least one pair of reference sinusoidal signals of the same frequency;

    wherein there is produced one or more output signals which are a linear combination of selected of said reference signals, said output signals being applied to a transmitter which produces at least one transmission signal said transmission signal being applied to the transmission circuit and transmitter coil combination to produce an interrogating magnetic field for detection of a target.

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