SENSING COIL ARRANGEMENT FOR A METAL DETECTOR
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Abstract
A SENSING COIL ARRANGEMENT FOR A METAL DETECTOR WHICH HAS WERY SMALL VOLTAGES INDUCED BETWEEN ANY TWO POINTS OF THE SENSING COIL. THE COIL ARRANGEMENT IS INSENSITIVE TO HAND EFFACTS. THE COIL ARRANGEMENT COMPRISES A PRIMARY COIL AND A SECONDARY COIL WHICH IS DECOUPLED FROM THE PRIMARY COIL AND ATTACHED TO AN AMPLIFICATION AND SENING DEVICE WHICH INTERPRETS THE SIGNAL FROM THE SECONDARY COIL. GREAT FLEXIBILITY EXISTS IN THE NUMBER OF SECONDARY COILS USED AND IN THE ACTUAL CONFIGURATION AND PLACEMENT OF THE SECONDARY COILS. THE COIL ARRANGEMENT GIVES HIGH SENSITIVITY TO METAL OBJECTS PRESENT IN THE FORWARD HEMISPHERE. THE COILS CAN BE ARRANGED SO THAT THE DIRECTION OF THE METAL OBJECTS RELATIVE TO THE COILS MAY BE DETERMINED. PRINTED CIRCUITS MAY BE USED IN PLACE OF MULTITURN LOOPS OF WIRE.
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