JP2015194419A5 - - Google Patents
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- JP2015194419A5 JP2015194419A5 JP2014072769A JP2014072769A JP2015194419A5 JP 2015194419 A5 JP2015194419 A5 JP 2015194419A5 JP 2014072769 A JP2014072769 A JP 2014072769A JP 2014072769 A JP2014072769 A JP 2014072769A JP 2015194419 A5 JP2015194419 A5 JP 2015194419A5
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- 238000001514 detection method Methods 0.000 claims description 52
- 230000005284 excitation Effects 0.000 claims description 8
- 239000000523 sample Substances 0.000 claims description 4
Description
上記目的を達成するために、本発明は、励磁コイル、前記励磁コイルに対して第１の並び方向に配置された第１検出コイル、及び前記励磁コイルに対して前記第１の並び方向と交差する第２の並び方向に配置された第２検出コイルを有する渦電流探傷プローブを用いた渦電流探傷方法において、前記第１検出コイルの検出信号と前記第２検出コイルの検出信号との差分を演算して差分信号を生成し、前記第１検出コイルの検出信号の絶対値及び前記第２検出コイルの検出信号の絶対値のうちの大きいほうの絶対値を前記差分信号の絶対値と比較して、前記差分信号の絶対値より小さい場合にきず有りと判定し、前記差分信号の絶対値より大きい場合にきず無しと判定する。 To achieve the above object, the present invention includes an excitation coil, a first detection coil disposed in a first arrangement direction with respect to the exciting coil, and the first alignment direction with respect to the excitation coil In an eddy current flaw detection method using an eddy current flaw detection probe having second detection coils arranged in intersecting second arrangement directions, a difference between a detection signal of the first detection coil and a detection signal of the second detection coil To generate a differential signal and compare the absolute value of the absolute value of the detection signal of the first detection coil and the absolute value of the detection signal of the second detection coil with the absolute value of the differential signal Then, it is determined that there is a flaw when it is smaller than the absolute value of the difference signal, and it is determined that there is no flaw when it is larger than the absolute value of the difference signal.
上記目的を達成するために、本発明は、励磁コイル、前記励磁コイルに対して第１の並び方向に配置された第１検出コイル、及び前記励磁コイルに対して前記第１の並び方向と交差する第２の並び方向に配置された第２検出コイルを有する渦電流探傷プローブを備えた渦電流探傷装置において、前記第１検出コイルの検出信号と前記第２検出コイルの検出信号との差分を演算して差分信号を生成する差分演算部と、前記第１検出コイルの検出信号の絶対値及び前記第２検出コイルの検出信号の絶対値のうちの大きいほうの絶対値を前記差分信号の絶対値と比較することにより、きずの有無を判定する比較判定部とを備え、前記比較判定部は、前記第１検出コイルの検出信号の絶対値及び前記第２検出コイルの検出信号の絶対値のうちの大きいほうの絶対値が前記差分信号の絶対値より小さい場合にきず有りと判定し、前記差分信号の絶対値より大きい場合にきず無しと判定する。 To achieve the above object, the present invention includes an excitation coil, a first detection coil disposed in a first arrangement direction with respect to the exciting coil, and the first alignment direction with respect to the excitation coil In an eddy current flaw detector provided with an eddy current flaw detection probe having a second detection coil arranged in the intersecting second arrangement direction, the difference between the detection signal of the first detection coil and the detection signal of the second detection coil A difference calculation unit that generates a difference signal by calculating the difference between the absolute value of the detection signal of the first detection coil and the absolute value of the detection signal of the second detection coil. A comparison / determination unit that determines the presence or absence of a flaw by comparing with an absolute value, and the comparison / determination unit includes an absolute value of a detection signal of the first detection coil and an absolute value of a detection signal of the second detection coil Big of The sale of an absolute value is determined that there flaws is smaller than the absolute value of the difference signal, it is determined that no scratches when the absolute value is greater than said difference signal.
Claims (2)
前記第１検出コイルの検出信号と前記第２検出コイルの検出信号との差分を演算して差分信号を生成し、
前記第１検出コイルの検出信号の絶対値及び前記第２検出コイルの検出信号の絶対値のうちの大きいほうの絶対値を前記差分信号の絶対値と比較して、前記差分信号の絶対値より小さい場合にきず有りと判定し、前記差分信号の絶対値より大きい場合にきず無しと判定することを特徴とする渦電流探傷方法。 Excitation coil, a first detection coil disposed in a first arrangement direction with respect to the excitation coil, and the placed in a second arrangement direction intersecting with the first arrangement direction with respect to the exciting coil In an eddy current testing method using an eddy current testing probe having two detection coils,
Calculating a difference between the detection signal of the first detection coil and the detection signal of the second detection coil to generate a difference signal;
The larger absolute value of the absolute value of the detection signal of the first detection coil and the absolute value of the detection signal of the second detection coil is compared with the absolute value of the differential signal, and the absolute value of the differential signal is An eddy current flaw detection method characterized in that it is determined that there is a flaw when it is small and that there is no flaw when it is larger than the absolute value of the difference signal.
前記第１検出コイルの検出信号と前記第２検出コイルの検出信号との差分を演算して差分信号を生成する差分演算部と、
前記第１検出コイルの検出信号の絶対値及び前記第２検出コイルの検出信号の絶対値のうちの大きいほうの絶対値を前記差分信号の絶対値と比較することにより、きずの有無を判定する比較判定部とを備え、
前記比較判定部は、前記第１検出コイルの検出信号の絶対値及び前記第２検出コイルの検出信号の絶対値のうちの大きいほうの絶対値が前記差分信号の絶対値より小さい場合にきず有りと判定し、前記差分信号の絶対値より大きい場合にきず無しと判定することを特徴とする渦電流探傷装置。 Excitation coil, a first detection coil disposed in a first arrangement direction with respect to the excitation coil, and the placed in a second arrangement direction intersecting with the first arrangement direction with respect to the exciting coil In an eddy current flaw detector provided with an eddy current flaw probe having two detection coils,
A difference calculation unit that calculates a difference between a detection signal of the first detection coil and a detection signal of the second detection coil to generate a difference signal;
The presence / absence of a flaw is determined by comparing the absolute value of the absolute value of the detection signal of the first detection coil and the absolute value of the detection signal of the second detection coil with the absolute value of the difference signal. A comparison judgment unit,
The comparison / determination unit has a flaw when the larger absolute value of the absolute value of the detection signal of the first detection coil and the absolute value of the detection signal of the second detection coil is smaller than the absolute value of the difference signal. The eddy current flaw detector is characterized in that it is determined that there is no flaw when it is larger than the absolute value of the difference signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014072769A JP6170005B2 (en) | 2014-03-31 | 2014-03-31 | Eddy current flaw detection method and eddy current flaw detection apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014072769A JP6170005B2 (en) | 2014-03-31 | 2014-03-31 | Eddy current flaw detection method and eddy current flaw detection apparatus |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2015194419A JP2015194419A (en) | 2015-11-05 |
| JP2015194419A5 true JP2015194419A5 (en) | 2016-09-15 |
| JP6170005B2 JP6170005B2 (en) | 2017-07-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2014072769A Active JP6170005B2 (en) | 2014-03-31 | 2014-03-31 | Eddy current flaw detection method and eddy current flaw detection apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP6170005B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6751645B2 (en) * | 2016-10-20 | 2020-09-09 | 日立Ｇｅニュークリア・エナジー株式会社 | Eddy current flaw detection system and eddy current flaw detection method |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2753534B1 (en) * | 1996-09-13 | 1999-04-23 | Intercontrole Sa | EDGE CURRENT PROBE FOR NON-DESTRUCTIVE INSPECTION OF ELECTRICALLY CONDUCTIVE PARTS |
| TR200002716A2 (en) * | 1999-09-22 | 2001-04-20 | General Electric Company | Induction current setting size |
| JP2004028897A (en) * | 2002-06-27 | 2004-01-29 | Osaka Gas Co Ltd | Eddy-current flaw detection apparatus |
| JP4311416B2 (en) * | 2006-06-30 | 2009-08-12 | 株式会社日立製作所 | Surface defect length evaluation method by eddy current testing |
| JP4902448B2 (en) * | 2007-07-10 | 2012-03-21 | 株式会社日立製作所 | Defect identification method and defect identification apparatus |
| US20130249540A1 (en) * | 2012-03-22 | 2013-09-26 | Olympus Ndt Inc. | Eddy current array probe and method for lift-off compensation during operation without known lift references |
| JP5710536B2 (en) * | 2012-03-29 | 2015-04-30 | 日立Ｇｅニュークリア・エナジー株式会社 | Calibration check method for eddy current flaw detector and eddy current flaw detector |
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2014
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