Metal detector
First Claim
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.
1 Assignment
0 Petitions
Accused Products
Abstract
A sensor for the location of metallic objects and also an associated method comprise a plurality of transmitting coils (2.1, 2.2) and at least one receiving coil (1.9) which are arranged such as to be inductively coupled to one another and overlap to a partial extent for the purposes of decoupling the interaction therebetween, whereby there can be obtained a point of optimal cancellation of the interaction. Due to the fact that a flow of current is passed through the transmitting coils (2.1, 2.2) by a sensor electronic system, equal flows of current through the transmitting coils have an effect upon the at least one receiving coil (1.9) which results in a local point of optimal cancellation which moves in a first direction when there is a flow of current in a first transmitting coil (2.1), whereas it moves in another direction when there is a flow of current in a further transmitting coil (2.2), and due to the fact that there is provided a control circuit for the regulation of the currents in the transmitting coils which leads to a displacement of the local point of optimal cancellation which causes cancellation of the received signal, a simple and effective sensor is thereby produced.
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Citations
23 Claims
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1. A sensor comprising:
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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, and the 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 22)
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13. A method for locating objects utilizing a sensor, the 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 at which cancellation of a received signal is caused, the method comprising:
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passing a plurality of flows of current through the at least one transmitting coil; evaluating the received signal received by the at least one receiving coil, wherein the plurality of flows of current is passed through a plurality of transmitting coils by a sensor electronic system, wherein the at least one transmitting coil comprises a plurality of transmitting coils, 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 at least one 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 at least one further transmitting coil, the local decoupling point moves in a second direction, wherein the plurality of flows of current through the plurality of transmitting coils are regulated in such a way that there results a displacement of the local decoupling point which causes cancellation of the received signal, and wherein a control value of a control circuit serves as a measured value for the nearness of a metal object and is configured for regulating the plurality of flows of current through the plurality of transmitting coils and the control circuit is configured for cancelling the signal received by the at least one receiving coil. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 23)
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Specification