Electromagnetic Induction ( Paper Ii )
نویسنده
چکیده
Typical components of a metal detector include a transmitter and receiver coil. As depicted in Figure B.1, electric currents that flow in the transmitter coil radiate a primary magnetic field that penetrates the surrounding medium and any nearby metallic object. A timechanging primary magnetic field will induce so-called eddy currents in the buried object, and these currents in turn radiate a secondary magnetic field that is sensed (picked up) by the receiver coil. An audio tone is produced whenever the metallic object causes the induced receiver coil voltage to exceed some threshold.
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