Eddy Current Testing is a technique used for the surface inspection of conducting materials. By placing a probe coil close to the surface under test, eddy currents are induced in the conducting surface. This leads to a change in the inductance of the probe coil.
This article shows how to calculate the impedance of a multi loop probe coil close to a conducting surface.
The calculated results are then verified by measuring the impedance of the probe coil in the frequency range from 100 Hz to 100 kHz using the Bode 100.
