US 11,835,483 B2
Magnetic flaw detection method, magnetic field measurement processing apparatus, and magnetic flaw detection apparatus
Shinya Mito, Tokyo (JP); Kazunori Miyazawa, Tokyo (JP); Fumitake Terao, Tokyo (JP); Shoma Takeda, Tokyo (JP); and Shoichi Shiosaki, Tokyo (JP)
Assigned to YOKOGAWA ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 17/911,050
Filed by YOKOGAWA ELECTRIC CORPORATION, Tokyo (JP)
PCT Filed Mar. 4, 2021, PCT No. PCT/JP2021/008545
§ 371(c)(1), (2) Date Sep. 12, 2022,
PCT Pub. No. WO2021/182310, PCT Pub. Date Sep. 16, 2021.
Claims priority of application No. 2020-044811 (JP), filed on Mar. 13, 2020.
Prior Publication US 2023/0108846 A1, Apr. 6, 2023
Int. Cl. G01N 27/83 (2006.01)
CPC G01N 27/83 (2013.01) 10 Claims
OG exemplary drawing
 
1. A magnetic flaw detection method comprising:
a magnetization step of moving a magnet in a predetermined direction along a surface of an object that is a magnetic body and subsequently removing the magnet from the surface of the object to magnetize a region corresponding to a movement range of the magnet on the object;
a sensor arrangement step of arranging a magnetic sensor to be capable of measuring magnetic flux leakage generated from an abnormal portion of the region that was magnetized in the object after the magnet is separated from the surface of the object to an extent that a magnetic field generated from the magnet does not have a magnetic effect on the object; and
a detection step of detecting an abnormality in the region with the magnetic sensor arranged by the sensor arrangement step.