Patent ID: 9453818
Filing Date: 2016-09-27
CPC Classification: G01N

Claim Text:
1. An eddy current flaw detection probe comprising: a first yoke having a hollow-cylindrical shape and composed of a magnetic material; a second yoke having a hollow-cylindrical or pillar shape, composed of a magnetic material, and inserted in a freely insertable and extractable manner along an inner peripheral surface of the first yoke; a first permanent magnet mounted along an outer peripheral surface of one end part of the axis direction of the first yoke and polarized in a radial direction of the first yoke; a second permanent magnet mounted along an outer peripheral surface of the other end part of the axis direction of the first yoke, polarized in a radial direction of the first yoke, and magnetized such that the magnetic poles are different from those of the first permanent magnet; and a sensing coil wound along the outer peripheral surface in a center part of the axis direction of the first yoke and detecting a change in a magnetic flux generated by the first permanent magnet and the second permanent magnet.