Eddy current testing equipment generates magnetic fields,
which induce a current that flows in a test piece (e.g., a conductor such as a
coil). This influences the magnetic field, as well as the magnitude and phase
of voltage in the coil. Any changes in conductivity, such as defects or
thickness differences, can affect the resulting eddy current. This technology
can then be used to measure distance or to detect flaws in conducting materials
such as corrosion, erosion, wear, pitting, baffle cuts, wall loss, and cracks.