VERSATILE NDT METHOD TO DETECT SURFACE DEFECTS IN CONDUCTIVE MATERIALS
Eddy current technique is an important electromagnetic non-destructive evaluation technique that is widely used in power, aerospace, petrochemical and other industries for flaw detection, material and coating thickness measurements, material identification and establishing the heat treatment condition of certain materials.
The eddy current method is based on the principle of generating circular electrical currents (eddy currents) in a conductive material. This is achieved by the use of a coil connected to an alternating current generator driving an alternating magnetic field (primary field).
It is a versatile NDT method that can be used to detect (near) surface defects in conductive materials without removing the coating. An electromagnetic inductor is used to generate a magnetic field.
