JP5507782B2 - 導電材料中のクラックの検出 - Google Patents
導電材料中のクラックの検出 Download PDFInfo
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- JP5507782B2 JP5507782B2 JP2002521967A JP2002521967A JP5507782B2 JP 5507782 B2 JP5507782 B2 JP 5507782B2 JP 2002521967 A JP2002521967 A JP 2002521967A JP 2002521967 A JP2002521967 A JP 2002521967A JP 5507782 B2 JP5507782 B2 JP 5507782B2
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- diameter
- inspection
- coil
- probe
- thickness
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- 239000004020 conductor Substances 0.000 title description 11
- 238000001514 detection method Methods 0.000 title description 3
- 238000000034 method Methods 0.000 claims description 22
- 238000007689 inspection Methods 0.000 claims description 19
- 239000000523 sample Substances 0.000 claims description 14
- 230000005540 biological transmission Effects 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 239000010426 asphalt Substances 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 230000003213 activating effect Effects 0.000 claims description 2
- 230000008569 process Effects 0.000 claims description 2
- 239000012811 non-conductive material Substances 0.000 description 8
- 239000004567 concrete Substances 0.000 description 5
- 230000004907 flux Effects 0.000 description 5
- 239000011150 reinforced concrete Substances 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000007716 flux method Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
- G01N27/9013—Arrangements for scanning
- G01N27/902—Arrangements for scanning by moving the sensors
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Description
この目的のため本発明は、橋の支持板のような鋼製物体であって、層の厚さが20mmを越えるアスファルト、コンクリート又は鉄筋コンクリート製非導電層で被覆されている該鋼製物体中に渦電流を誘導する送信システムと、磁場の強度又は磁場の強度変化を指示する信号を与える受信システムとを備えたプローブを用いて該物体中のクラックを検出する方法において、
a)前記物体の1組の検査すべき点を選択する工程、
b)該組から最初の検査点を選択する工程、
c)該選択された検査点に前記プローブを置き、前記送信システムを作動して前記物体中に渦電流を誘導する工程、
d)一定期間、前記受信システムにより与えられた信号の記録を取る工程、
e)該記録を調べて基準の記録と比較する工程であって、該比較からクラックの存在又は不存在が推定できる該工程、及び
f)前記組の次の検査点を選択し、全ての検査点について順番が来るまで工程c)〜e)を繰り返す工程、
を含む前記検出方法を提供する。
プローブ1は、平板3状の導電材料製物体の近くに配置する。導電材料の物体3は、近い表面5(プローブ1に最も近い表面)及び遠い表面6を有する。平板3の遠い表面6には、図面の平面に対し垂直方向に延びるクラック7がある。物体は、非導電材料の層9で被覆されている。
送信システムは、送信コイル11を付勢する装置(図示せず)を有し、また受信システムは、受信コイル12からの信号を記録する装置(図示せず)を有する。
プローブ1は、選択された検査点15に置く。プローブと物体の近い表面5間の距離Lはリフトオフであり、リフトオフは、非導電材料層9の厚さにほぼ等しい。
平板3中に誘導された渦電流は電磁場を発生し、一定期間、受信コイル12で付与された信号の記録を取る。この記録を調べ、基準の記録と比較すると、この比較からクラックの存在又は不存在が推定できる。引き続き、次の検査点を選択するなどを行う。
比較を実施できる他の方法は、一定期間の受信信号の減衰を、既知の壁厚さを指示する標準の減衰と比較することによる。
3‥‥導電材料製物体
5‥‥物体の近い表面
6‥‥物体の遠い表面
7‥‥クラック
9‥‥非導電層
10‥‥箱
11‥‥送信コイル
12‥‥受信コイル
15‥‥検査点
Claims (1)
- 非導電層で被覆されている物体中に渦電流を誘導する送信システムと、磁場の強度又は磁場の強度変化を指示する信号を与える受信システムとを備えたプローブを用いて該物体中のクラックを検出する方法において、
a)前記物体の複数の検査すべき点を選択する工程、
b)該複数の検査点から1つの検査点を選択する工程、
c)該選択された検査点に前記プローブを置き、前記送信システムを作動して前記物体中に渦電流を誘導する工程、
d)経時に従って、前記受信システムで付与された信号の記録を取る工程、
e)該記録を調べて基準の記録と比較する工程であって、該比較からクラックの存在又は不存在が推定できる該工程、及び
f)引続き前記複数の検査点から他の1つの検査点を選択し、全ての検査点で検査が終了するまで工程c)〜e)を繰り返す工程、
からなり、
・前記物体は橋の鋼製支持板であり;
・前記非導電層はアスファルト製で、層の厚さは20mmを越え;
・前記送信システムは、前記非導電層の厚さにほぼ等しい直径を有する2個の送信コイルを、送信コイルの直径に対し10〜90%、横方向の間隔で隔離されて含み;
・前記受信システムは、前記送信コイルの直径に対し50〜90%の範囲の直径を有する2個の受信コイルを、受信コイルの直径に対し10〜90%、横方向の間隔で隔離されて含む;
ことを特徴とする方法。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00307301.2 | 2000-08-24 | ||
EP00307301 | 2000-08-24 | ||
PCT/EP2001/009888 WO2002016922A2 (en) | 2000-08-24 | 2001-08-24 | Method for detecting cracks in electrically conducting materials |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2004507735A JP2004507735A (ja) | 2004-03-11 |
JP5507782B2 true JP5507782B2 (ja) | 2014-05-28 |
Family
ID=8173220
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2002521967A Expired - Fee Related JP5507782B2 (ja) | 2000-08-24 | 2001-08-24 | 導電材料中のクラックの検出 |
Country Status (7)
Country | Link |
---|---|
US (1) | US6707296B2 (ja) |
EP (1) | EP1311844A2 (ja) |
JP (1) | JP5507782B2 (ja) |
AU (1) | AU2002212169A1 (ja) |
CA (1) | CA2420318A1 (ja) |
NO (1) | NO20030817L (ja) |
WO (1) | WO2002016922A2 (ja) |
Families Citing this family (16)
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---|---|---|---|---|
US6570379B2 (en) * | 2000-08-24 | 2003-05-27 | Shell Oil Company | Method for inspecting an object of electrically conducting material |
US6538435B2 (en) * | 2000-08-24 | 2003-03-25 | Shell Oil Company | Method for detecting an anomaly in an object of electrically conductive material along first and second direction at inspection points |
DE10102577C1 (de) * | 2001-01-20 | 2002-06-20 | Univ Braunschweig Tech | Verfahren zur Zustandserkennung von elektrisch leitfähigen länglichen Spanngliedern |
JP2003294712A (ja) * | 2002-03-29 | 2003-10-15 | Non-Destructive Inspection Co Ltd | 橋梁用伸縮継手の検査装置及び検査方法 |
EP1576335B1 (en) * | 2002-12-19 | 2007-06-27 | Shell Internationale Researchmaatschappij B.V. | Monitoring wall thickness |
KR100683927B1 (ko) | 2004-12-31 | 2007-02-15 | 재단법인서울대학교산학협력재단 | 테일 패치를 이용한 자기변형 트랜스듀서와, 이를 이용한탄성파 측정 장치 |
FR2881826A1 (fr) * | 2005-02-04 | 2006-08-11 | Commissariat Energie Atomique | Procede de conception et de realisation d'un dispositif de controle a courants de foucault |
KR100677920B1 (ko) | 2005-10-20 | 2007-02-05 | 재단법인서울대학교산학협력재단 | 자기변형 효과를 이용하여 봉이나 축, 또는 배관 부재에비틀림파를 발생 및 측정하는 방법, 그 방법을 이용한자기변형 트랜스듀서, 및 구조 진단 장치 |
DK2064413T3 (en) * | 2006-09-21 | 2018-02-12 | Tüv Rheinland Sonovation Holding B V | DEVICE AND PROCEDURE FOR DETECTING AN ANOMALY IN A COLLECTION OF A FIRST AND SECOND ITEM |
CA2833330C (en) | 2011-05-10 | 2016-04-19 | Bell Helicopter Textron Inc. | System and method for measuring wrinkle depth in a composite structure |
US20130214771A1 (en) * | 2012-01-25 | 2013-08-22 | Radiation Monitoring Devices, Inc. | Systems and methods for inspecting structures including pipes and reinforced concrete |
CA2945425C (en) * | 2014-04-14 | 2023-03-14 | Eddyfi Ndt Inc. | Eddy current array probe with independent transmitters |
JP6175091B2 (ja) * | 2015-03-05 | 2017-08-02 | 非破壊検査株式会社 | 渦電流検査装置及び渦電流検査方法 |
CA2951848C (en) | 2015-12-15 | 2024-01-16 | Eddyfi Ndt Inc. | Pulsed eddy current testing with dual-purpose coils |
KR102178721B1 (ko) * | 2020-08-24 | 2020-11-13 | 한국건설기술연구원 | 유도전압 측정을 이용한 텐던의 손상 탐지방법 및 손상 탐지장치 |
KR102275062B1 (ko) * | 2020-10-20 | 2021-07-08 | 한국건설기술연구원 | 유도자기장 형성 및 유도전압 측정을 이용한 텐던 모니터링 장치, 이를 구비한 텐던 손상탐지 시스템, 및 텐던 손상탐지 방법 |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS61151402A (ja) * | 1984-12-26 | 1986-07-10 | Nippon Kokan Kk <Nkk> | 差動相互誘導型渦流計測用センサ |
DE3542159A1 (de) * | 1985-11-28 | 1987-06-04 | Nukem Gmbh | Verfahren zur werkstoffpruefung nach dem wirbelstromprinzip und vorrichtung zur durchfuehrung des verfahrens |
JPS62134552A (ja) * | 1985-12-07 | 1987-06-17 | Science & Tech Agency | 渦電流探傷法による亀裂深さ測定装置 |
US4990851A (en) * | 1987-12-17 | 1991-02-05 | Atlantic Richfield Company | Transient electromagnetic method for detecting irregularities on conductive containers |
US4839593A (en) * | 1987-12-17 | 1989-06-13 | Atlantic Richfield Company | Transient electromagnetic method for directly detecting corrosion on conductive containers |
US4929898A (en) * | 1987-12-17 | 1990-05-29 | Atlantic Richfield | Transient electromagnetic method for detecting irregularities on conductive containers |
US4929896A (en) * | 1988-12-29 | 1990-05-29 | Atlantic Richfield Company | Transient electromagnetic method for detecting irregularies on conductive containers having variations in jacket thickness |
US5028100A (en) * | 1989-06-15 | 1991-07-02 | Trustees Of The Thomas A. D. Gross 1988 Revocable Trust | Methods for nondestructive eddy-current testing of structural members with automatic characterization of faults |
JPH0618484A (ja) * | 1992-06-30 | 1994-01-25 | Nippon Seiko Kk | 渦電流検査装置 |
US5416411A (en) | 1993-01-08 | 1995-05-16 | Lockheed Fort Worth Company | System and method for measuring the thickness of a ferromagnetic layer |
US5461313A (en) | 1993-06-21 | 1995-10-24 | Atlantic Richfield Company | Method of detecting cracks by measuring eddy current decay rate |
JPH09281082A (ja) * | 1996-04-12 | 1997-10-31 | Shimizu Corp | 金属部材の損傷診断装置 |
US6291992B1 (en) * | 1996-07-12 | 2001-09-18 | Shell Oil Company | Eddy current inspection technique |
US6037768A (en) | 1997-04-02 | 2000-03-14 | Iowa State University Research Foundation, Inc. | Pulsed eddy current inspections and the calibration and display of inspection results |
JPH11101783A (ja) | 1997-09-26 | 1999-04-13 | Toshiba Corp | タービン翼のき裂寸法計測装置およびその方法 |
JPH11160285A (ja) * | 1997-11-28 | 1999-06-18 | Takenaka Komuten Co Ltd | 磁気探傷装置 |
JP3437074B2 (ja) * | 1997-12-17 | 2003-08-18 | 日本電信電話株式会社 | コンクリートポール内の鉄筋破断位置検知装置及びその方法 |
US6538435B2 (en) * | 2000-08-24 | 2003-03-25 | Shell Oil Company | Method for detecting an anomaly in an object of electrically conductive material along first and second direction at inspection points |
US6570379B2 (en) * | 2000-08-24 | 2003-05-27 | Shell Oil Company | Method for inspecting an object of electrically conducting material |
-
2001
- 2001-08-18 US US09/931,982 patent/US6707296B2/en not_active Expired - Lifetime
- 2001-08-24 CA CA002420318A patent/CA2420318A1/en not_active Abandoned
- 2001-08-24 JP JP2002521967A patent/JP5507782B2/ja not_active Expired - Fee Related
- 2001-08-24 EP EP01980286A patent/EP1311844A2/en not_active Withdrawn
- 2001-08-24 AU AU2002212169A patent/AU2002212169A1/en not_active Abandoned
- 2001-08-24 WO PCT/EP2001/009888 patent/WO2002016922A2/en active Application Filing
-
2003
- 2003-02-21 NO NO20030817A patent/NO20030817L/no not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
WO2002016922A2 (en) | 2002-02-28 |
JP2004507735A (ja) | 2004-03-11 |
WO2002016922A3 (en) | 2002-09-26 |
NO20030817L (no) | 2003-04-22 |
EP1311844A2 (en) | 2003-05-21 |
NO20030817D0 (no) | 2003-02-21 |
CA2420318A1 (en) | 2002-02-28 |
US20020047706A1 (en) | 2002-04-25 |
AU2002212169A1 (en) | 2002-03-04 |
US6707296B2 (en) | 2004-03-16 |
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