Patent ID: 8283918
Filing Date: 2012-10-09
Classification: B24B,F22B,G21C,Y02E

Abstract:
1. A defect detection apparatus for an inside of a steam generator tubing in a nuclear reactor, the apparatus comprising: a bobbin type probe forming a magnetizing force using a coil which is wound in a circumferential direction on at least one bobbin to acquire first detection information to determine a defect of the steam generator tubing; a yoke type probe forming a magnetizing force using a coil which is wound in an axial direction on at least one yoke to acquire second detection information from the steam generator tubing, wherein the at least one yoke is located in a direction perpendicular with the at least one bobbin; and a signal processor for processing the second detection information to generate a corresponding digital signal, the signal processor further comprises: a voltage control circuit supplying a power to a first coil of the yoke type probe, a magnetic sensor sensing a magnetic flux change, having been formed on a second coil of the yoke type probe as a result of the supplying of the power to the first coil of the yoke type probe, and generating the second detection information, and an analog to digital (AD) converter converting the second detection information to generate the corresponding digital signal, wherein the defect detection apparatus determines a material at a location of the defect from a magnetic phase based on the first detection information and one or more of the corresponding digital signal and the second detection information.