US 11,860,127 B2
Eddy current probe based on Halbach array coil
Zhongshan Tian, Beijing (CN); Xianzhong Wang, Guangzhou (CN); Lin Yi, Guangzhou (CN); Changqun Yang, Guangzhou (CN); Daodong Niu, Guangzhou (CN); and Jiaming Liang, Guangzhou (CN)
Assigned to CHINA OIL & GAS PIPELINE NETWORK CORPORATION, Beijing (CN); and SOUTH CHINA COMPANY, CHINA OIL & GAS PIPELINE NETWORK CORPORATION, Guangzhou (CN)
Filed by China Oil & Gas Pipeline Network Corporation, Beijing (CN); and South China Company, China Oil & Gas Pipeline Network Corporation, Guangzhou (CN)
Filed on Mar. 28, 2022, as Appl. No. 17/705,452.
Claims priority of application No. 202111056515.X (CN), filed on Sep. 9, 2021.
Prior Publication US 2022/0214309 A1, Jul. 7, 2022
Int. Cl. G01N 27/90 (2021.01); G01R 1/067 (2006.01); H01F 7/20 (2006.01)
CPC G01N 27/9006 (2013.01) [G01R 1/067 (2013.01); H01F 7/20 (2013.01)] 2 Claims
OG exemplary drawing
 
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.