Metal marker tag detection system based on eddy current technology
A metal label and detection system technology, applied in the field of metal label detection systems using eddy current technology, can solve the problems of long-term use, inability to automatically identify, high relative price, and achieve the effects of high detection speed, small size and high sensitivity
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[0017] Such as figure 1 , 2 As shown, the present invention discloses a metal label detection system using eddy current technology, which includes an AC signal generator 1, and a detection coil 2, phase amplitude / detector 3, DC offset / amplifier 4, analog / digital The converter 5 and the digital signal processor 6, the AC signal generator 1 is respectively connected to the detection coil 2 and the phase amplitude / detector 3, and the detection coil 2 is wound on the outer surface of the magnetic core 8; The detection coil 2 of the magnetic core 8 is excited by the alternating current to induce a vortex current on the surface of the metal plate. The magnetic field generated by this current reacts to the magnetic field of the coil. When different metal symbol patterns appear under the detection coil 2, both ends of the coil The voltage produces different amplitude and phase changes. After processing by the amplitude / phase detector 3, DC offset and amplification, the output signal is ...
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