Patent ID: 11860127
Assignee: CHINA OIL & GAS PIPELINE NETWORK CORPORATION
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 0:
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.