Eddy current nondestructive testing

The eddy current non-destructive testing method is used in the up-to-date devices and allows you to measure thickness of the test object, detect defects and estimate their size (surface, subsurface, or located inside the test object).

The EC transducer consists of a ring or spiral-shaped coil through which an alternating current is passed, generating a primary magnetic field. Due to penetration of the magnetic field deep into the test object, the eddy currents arise. Defects located in the area of eddy current flow modify their trajectories, inducing a secondary magnetic field. The analysis of amplitude, phase, and shape of the EC secondary magnetic field makes it possible to determine the presence of defects, their size and shape, and enables you to measure the thickness of the test object.