The purpose of this paper is to compare performances of various sensing elements in eddy current non-destructive inspection. A new eddy current testing probe is designed to compare detection and resolution capabilities of different sensors. Three magnetic sensors, specifically GMR, AMR and Fluxgate, and a standard induction coil are used as a sensing element. The excitation part of the probe is realized by two circular coils connected in series, but magnetically opposite to drive uniform eddy currents. The comparison of these sensors is realized on non-magnetic conductive plate where EDM notches with different depths are introduced. The numerical simulations and experimental measurements are performed under the same conditions for this purpose. The results are presented and discussed in the paper.
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