Eddy Current Inspection

Eddy currents are used to detect defects on and below the surface of a material. An alternating magnetic field is applied to the surface of the material. This induces eddy currents in the material producing a magnetic field which opposes the applied magnetic field. The measured impedance is used to map the defects in the material. Low frequency eddy current, roughly 100 Hz – 50 kHz, is used to penetrate deeper into a material.