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Metal detector

  • US 9,835,752 B2
  • Filed: 05/18/2010
  • Issued: 12/05/2017
  • Est. Priority Date: 05/18/2009
  • Status: Active Grant
First Claim
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1. A sensor comprising:

  • at least one transmitting coil and at least one receiving coil which are inductively coupled to one another and are arranged in partly overlapping manner for decoupling an interaction there between, whereby there can be obtained a decoupling point of the interaction;

    a sensor electronic system for passing a flow of current through the at least one transmitting coil and for evaluating a signal received by the at least one receiving coil;

    wherein the at least one transmitting coil comprises a plurality of transmitting coils through which a plurality of flows of current are passed by the sensor electronic system;

    wherein, in the case of equal current flows, the plurality of transmitting coils have an effect upon the at least one receiving coil such that a local decoupling point occurs;

    wherein the plurality of transmitting coils comprises at least one first transmitting coil and at least one further transmitting coil, wherein the plurality of flows of current comprises a first flow of current and a second flow of current, wherein in the case of the first flow of current being uneven through the first transmitting coil, the local decoupling point moves in a first direction, whereas in the case of the second flow of current being uneven through the further transmitting coil, the local decoupling point moves in a second direction, andthe sensor further comprising a control circuit having a control value, the control circuit being configured for cancelling the signal received by at least one receiving coil by regulating the plurality of flows of current through the plurality of transmitting coils,and the control value of the control circuit is used as a measured value for the nearness of a metal.

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