The eddy current machine inspects metals and other conductive materials with the help of electromagnetic induction. The main of the process is the same as the one, where a probe's coil is made to pass an alternating current (AC) through it, and a primary magnetic field is created. If the probe is brought near a piece of metal, the magnetic field that changes will create the eddy currents in the metal.
These currents have their own magnetic field, the one that is called secondary. If there is a flaw or a variation that the material has (e.g., a crack, rusting, or change in conductivity), the process of the eddy currents will get altered.
The change made in the secondary magnetic field will, as a consequence, affect the electrical properties of the probe coil.
The high-tech electronics of the machine will be able to record these small alterations that take place in the coil's impedance (the sum of resistance and reactance).
From this signal, it will be common for the system to detect, point out, and even si
