APPARATUS AND METHOD FOR SEARCHING EDDY CURRENT OF ELECTRIC HEAT TUBE USING MEASURING MAGNETIC PERMEABILITY IN STEAM GENERATOR
First Claim
1. A defect detection apparatus for an inside of a heat generating tube, the apparatus comprising:
- a bobbin type probe forming a magnetizing force using a coil which is wound on at least one bobbin located in a circumferential direction to acquire first detection information to determine a defect of the heat generating tube; and
a yoke type probe forming a magnetizing force using a coil which is wound in an axial direction of at least one yoke located in a perpendicular direction with the at least one bobbin to acquire second detection information from the heat generating tube,wherein the detecting apparatus determines a material by a magnetic phase, based on the second detection information.
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Abstract
A detection apparatus for an eddy current in a heat generating tube using a permeability measurement method, and a method using the apparatus are provided. In the detection apparatus, a bobbin type probe acquires detection information with respect to a magnetic flux change by a magnetic phase occurring in the heat generating tube using a coil which is wound in an axis direction of at least one yoke located in a perpendicular direction with a bobbin of the bobbin type probe, and a material having a corresponding magnetic phase and a circumferential defect, which is difficult to be detected by the bobbin type probe, are detected based on the detection information.
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Citations
14 Claims
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1. A defect detection apparatus for an inside of a heat generating tube, the apparatus comprising:
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a bobbin type probe forming a magnetizing force using a coil which is wound on at least one bobbin located in a circumferential direction to acquire first detection information to determine a defect of the heat generating tube; and a yoke type probe forming a magnetizing force using a coil which is wound in an axial direction of at least one yoke located in a perpendicular direction with the at least one bobbin to acquire second detection information from the heat generating tube, wherein the detecting apparatus determines a material by a magnetic phase, based on the second detection information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A defect detection method for an inside of a heat generating tube, the method comprising:
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forming a first magnetizing force using a coil which is wound on at least one bobbin located in a circumferential direction; sensing a change of the first magnetizing force, and acquiring first detection information to determine a defect of the heat generating tube; forming a second magnetizing force by using a coil which is wound in an axial direction of at least one yoke located in a perpendicular direction with the at least one bobbin; sensing a change of the second magnetizing force acquiring second detection information from the heat generating tube; and determining a material by a magnetic phase, based on the second detection information. - View Dependent Claims (12, 13, 14)
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Specification