An eddy current is a spiral type of current that is generated by electromagnetic induction as the magnetic field around a conductor changes.

As a magnetic field generated by an induction coil induces a current to a conductor, this current is called an eddy current. Such eddy currents generate a new magnetic field and are detected by a receiver coil.
It is possible to detect defects based on signals read by the receiver coil.

The level of sensitivity in an eddy current test is determined based on the eddy current density at the location of defects (location on the plane or its depth).
For this reason, a proper sensor is selected in consideration of the intensity of an eddy current to be induced at the location of the defects.

The depth of the eddy current penetration into a material depends on factors such as frequency, conductivity, and magnetic permeability.
The depth of penetration decreases as the frequency and permeability increases.
K-Albatross provides sensors of various frequency ranges in order to accommodate various material characteristics.