![]() The magnetic field caused by these pulses start eddy currents in metals close to the coil. In the other approach, current pulses are sent to the transmit coil. The amount of amplitude change and phase change is an indication for the size and distance of the metal, and can also be used to discriminate between ferrous and non-ferrous metals. If a piece of metal comes inside the range of the magnetic field lines, the receive coil can detect a change in both amplitude and phase of the received signal. A receive coil is used to pick up the magnetic field generated by the transmitter. In one approach, an alternating current is provided to a transmit coil. ![]() There are two general approaches to detect these changes. ![]() Most metal detectors work on the fact that metals in a magnetic field change the behavior of the field. ![]()
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