Eddy current testing is a method for the inspection of metallic parts. The probe, excited with an alternating current, induces an eddy current in the part being inspected.
Any discontinuities or material property variations that change the eddy current flow in the part are detected by the probe as a potential defect.
Benefits of eddy currents
- A quick, simple and reliable inspection technique to detect surface and near surface defects in conductive materials
- Can be used to measure the electrical conductivity of materials
- Measurements of non-conductive coatings
- Hole inspection with the use of a high speed rotating scanner and surface probe
Eddy current array technology
Eddy current array technology provides the ability to electronically drive and read several eddy current sensors positioned side by side in the same probe assemly. Data aquisition is made possible through the use of multiplexing, which avoids mutual inductance between individual coils.