NDT Non-Destructive Testing
Eddy Current Testing
Eddy Current Testing is an electrical technique detecting surface breaking defects in all electrically conducting materials through paint and surface coatings.
All electrical methods are indirect; a material property is measured as an electrical property variation.
A coil carrying an AC current is placed on the specimen surface. This generates circulating eddy currents in the specimen close to the surface and these in turn affect the current in the coil by mutual induction. Flaws and material variations affect the strength of the eddy currents. The presence of flaws is therefore measured by electrical changes in the excitation coil. Applications range from crack detection to metal sorting and from tube, bar and weld inspection.
Non Destructive Testing - Eddy Current Testing