CPC G01N 27/9006 (2013.01) [G01R 1/067 (2013.01); H01F 7/20 (2013.01)] | 2 Claims |
1. An eddy current probe based on a Halbach array coil, wherein the probe comprises a first coil, a second coil, a third coil, a fourth coil, and a fifth coil;
wherein the first coil, the third coil, and the fifth coil are horizontally placed;
the second coil and the fourth coil are vertically placed;
a first current is introduced in the first coil to generate a first magnetic field;
a second current is introduced in the second coil to generate a second magnetic field;
a third current in a direction opposite to the first current is introduced in the third coil to generate a third magnetic field;
a fourth current in a direction opposite to the second current is introduced in the fourth coil to generate a fourth magnetic field;
a fifth current in the same direction as the first current is introduced in the fifth coil to generate a fifth magnetic field; and
wherein the eddy current probe is configured to detect a displacement of a conductor based on a change of an impedance of at least one of the first coil, the second coil, the third coil, the fourth coil, and the fifth coil.
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