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This blog provides a brief explanation of how pulse induction circuits detect metal objects. Pulse induction metal detection relies on the fact that when metal is in a changing magnetic field, eddy currents are induced in the metal. These eddy currents form complete circuits which are equivalent to electro-magnets which generate their own magnetic fields. As these induced magnetic fields fluctuate, they also induce current in the originating inductor (antenna). If the antenna in this circuit i ...

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