Eddy Current Testing

This document deals with the theory of Eddy Current testing and shows that the Bode 100 can be used to measure the impedance of probe coils.

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.