Abstract
Planar eddy current (EC) probe is one of the most important EC probe for detecting the defects in conductive parts. A novel planar differential excitation EC probe are proposed and its excitation coil is obtained by the topological transformation combining the fractal Koch curve. To explore the right combination of the excitation coil and pickup coil and compare the performance of the probes, ten different configurations of the EC probe are studied by the simulations and experiment. The results show that the best pickup coil of each excitation is with the same shape and size of the excitation; The Koch excitation and Koch pickup probe have higher sensitivity for 3mm and 5mm length defects in the special direction than other configurations.
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