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 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, andan 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.
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Accused Products
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
21 Claims
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1. A defect detection apparatus for an inside of a steam generator tubing in a nuclear reactor, the apparatus comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 13, 14, 17, 19, 20, 21)
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9. 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 in a circumferential direction on at least one bobbin; sensing a change of the first magnetizing force, and acquiring first detection information to determine a defect of the heat generating tube; supplying a power to a first coil of at least one yoke with a voltage control circuit; forming a second magnetizing force by using the first coil of the at least one yoke which is wound in an axial direction on the at least one yoke, wherein the at least one yoke is located in a direction perpendicular with the at least one bobbin; sensing a change of the second magnetizing force, having been formed on a second coil of the at least one yoke as a result of the supplying of the power to the first coil of the at least one yoke, with a magnetic sensor and generating second detection information; converting the second detection information with an analog to digital (AD) converter to generate a corresponding digital signal; and determining 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. - View Dependent Claims (10, 11, 12, 15, 16, 18)
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Specification