Eddy current testing

Eddy current testing is used to discover discontinuities on and (just) below the surface in objects. Electromagnetism is used with the testing and the testing is based on the effect and generation van magnetic fields.

A coil will generate a magnetic field in the event of contact with the surface in the material to be examined. In its turn the magnetic field will generate eddy currents. If any change occurs in the material, such as cracks, surface roughness or fringe effects, this will result in a deviation in the magnetic fields of the eddy currents. This change will then be picked up by the coil and be shown on the instrument.

A great advantage of eddy current testing is that fluids are not used and that it can measure through a layer of coating. This saves a lot of time and money!