Metal detector

G - Physics – 01 – V

Patent

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Details

G01V 3/10 (2006.01)

Patent

CA 2758046

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.

L'invention concerne un détecteur pour localiser des objets métalliques et un procédé associé, ledit détecteur comprenant plusieurs bobines d'émission (2.1, 2.2) et au moins une bobine de réception (1.9) interconnectées par couplage inductif et disposées de façon à se chevaucher partiellement afin de découpler l'interaction, un point de suppression optimal de l'interaction pouvant être atteint. Un détecteur simple et efficace est obtenu du fait que les bobines d'émission (2.1, 2.2), alimentées en courant par le système électronique de détection, exercent, en cas d'égale alimentation, une action sur la ou les bobines de réception (1.9), qui engendre un point local de suppression optimale, qui se déplace dans une première direction, lorsque le courant parcourt une première bobine d'émission (2.1) et dans une autre direction lorsque le courant parcourt une autre bobine d'émission (2.2), et également du fait qu'il est prévu un circuit de régulation pour réguler les flux de courant des bobines d'émission, qui induit un déplacement du point local d'extinction optimale entraînant une suppression du signal de réception.

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