JPH0338542B2 - - Google Patents
Info
- Publication number
- JPH0338542B2 JPH0338542B2 JP56501635A JP50163581A JPH0338542B2 JP H0338542 B2 JPH0338542 B2 JP H0338542B2 JP 56501635 A JP56501635 A JP 56501635A JP 50163581 A JP50163581 A JP 50163581A JP H0338542 B2 JPH0338542 B2 JP H0338542B2
- Authority
- JP
- Japan
- Prior art keywords
- coil
- signal
- electromagnetic probe
- coils
- balance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000000523 sample Substances 0.000 description 35
- 230000008878 coupling Effects 0.000 description 15
- 238000010168 coupling process Methods 0.000 description 15
- 238000005859 coupling reaction Methods 0.000 description 15
- 238000007689 inspection Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 230000005284 excitation Effects 0.000 description 6
- 230000005291 magnetic effect Effects 0.000 description 5
- 230000007547 defect Effects 0.000 description 3
- 230000001066 destructive effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000003993 interaction Effects 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000003909 pattern recognition Methods 0.000 description 1
- 230000011514 reflex Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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
- G01N27/9046—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 by analysing electrical signals
Landscapes
- 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)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8016887 | 1980-05-22 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57500664A JPS57500664A (en]) | 1982-04-15 |
| JPH0338542B2 true JPH0338542B2 (en]) | 1991-06-11 |
Family
ID=10513586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56501635A Expired JPH0338542B2 (en]) | 1980-05-22 | 1981-05-19 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4496904A (en]) |
| JP (1) | JPH0338542B2 (en]) |
| DE (1) | DE3148640T1 (en]) |
| GB (1) | GB2078965B (en]) |
| WO (1) | WO1981003381A1 (en]) |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4495587A (en) * | 1981-12-08 | 1985-01-22 | Bethlehem Steel Corporation | Automatic nondestructive roll defect inspection system |
| US4652822A (en) * | 1984-07-16 | 1987-03-24 | John Wallace | Multi-frequency eddy-current system and method |
| DE3525250A1 (de) * | 1984-07-16 | 1986-01-16 | Casting Analysis Corp., Broadway, Va. | Genauigkeitsregeluntersystem und verfahren |
| US4651094A (en) * | 1984-07-16 | 1987-03-17 | John Wallace | Accuracy control subsystem |
| EP0251648A3 (en) * | 1986-06-24 | 1989-05-24 | British Aerospace Public Limited Company | Apparatus for locating the geometrical centre of a symmetrical bore |
| US5055784A (en) * | 1987-12-07 | 1991-10-08 | American Research Corporation Of Virginia | Bridgeless system for directly measuring complex impedance of an eddy current probe |
| US4922201A (en) * | 1989-01-09 | 1990-05-01 | The United States Of America As Represented By The Secretary Of The Navy | Eddy current method for measuring electrical resistivity and device for providing accurate phase detection |
| US4924182A (en) * | 1989-01-09 | 1990-05-08 | The United States Of America As Represented By The Secretary Of The Navy | Eddy current method to measure distance between scanned surface and a subsurface defect |
| USH879H (en) * | 1989-06-30 | 1991-01-01 | The United States Of America As Represented By The Secretary Of The Navy | Method and device for inspecting circumferentially conducting materials |
| DE69324242T2 (de) * | 1992-01-31 | 1999-08-19 | Northrop Grumman Corp. | Wirbelstromsondensystem in einem array |
| DE10229735A1 (de) * | 2002-07-02 | 2004-01-22 | rinas Gerätetechnik GmbH | Verfahren zum Erkennen und Lokalisieren von Materialfehlern |
| CA2504908A1 (en) * | 2004-04-23 | 2005-10-23 | Innovative Materials Testing Technologies, Inc. | Apparatus and method for eddy-current magnetic scanning a surface to detect sub-surface cracks around a boundary |
| US11710489B2 (en) | 2004-06-14 | 2023-07-25 | Wanda Papadimitriou | Autonomous material evaluation system and method |
| US11680867B2 (en) | 2004-06-14 | 2023-06-20 | Wanda Papadimitriou | Stress engineering assessment of risers and riser strings |
| US7626383B1 (en) | 2005-04-25 | 2009-12-01 | Innovative Materials Testing Technologies, Inc. | Apparatus and method for holding a rotatable eddy-current magnetic probe, and for rotating the probe around a boundary |
| US7560920B1 (en) | 2005-10-28 | 2009-07-14 | Innovative Materials Testing Technologies, Inc. | Apparatus and method for eddy-current scanning of a surface to detect cracks and other defects |
| US10324062B2 (en) * | 2013-10-22 | 2019-06-18 | Jentek Sensors, Inc. | Method and apparatus for measurement of material condition |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3302105A (en) * | 1964-08-26 | 1967-01-31 | Hugo L Libby | Eddy current nondestructive testing device using an oscilloscope to identify and locate irregularities in a test piece |
| US3693075A (en) * | 1969-11-15 | 1972-09-19 | Forster F M O | Eddy current system for testing tubes for defects,eccentricity,and wall thickness |
| FR2402871A1 (fr) * | 1977-09-09 | 1979-04-06 | Denis Emile | Procede permettant le controle non destructif par courants de foucault, dans des tubes, fils et pieces diverses, conducteurs de l'electricite |
| US4191922A (en) * | 1978-03-14 | 1980-03-04 | Republic Steel Corporation | Electromagnetic flaw detection system and method incorporating improved automatic coil error signal compensation |
| US4207520A (en) * | 1978-04-06 | 1980-06-10 | The United States Of America As Represented By The Secretary Of The Air Force | Multiple frequency digital eddy current inspection system |
| FR2443682A1 (fr) * | 1978-12-07 | 1980-07-04 | Commissariat Energie Atomique | Circuit de correction automatique d'un signal emis par un capteur differentiel desequilibre |
| FR2451032A1 (fr) * | 1979-03-09 | 1980-10-03 | Commissariat Energie Atomique | Appareil numerique pour le controle de pieces par courants de foucault |
-
1981
- 1981-05-19 DE DE813148640T patent/DE3148640T1/de active Granted
- 1981-05-19 JP JP56501635A patent/JPH0338542B2/ja not_active Expired
- 1981-05-19 WO PCT/GB1981/000089 patent/WO1981003381A1/en active Application Filing
- 1981-05-19 US US06/336,341 patent/US4496904A/en not_active Expired - Lifetime
- 1981-05-20 GB GB8115458A patent/GB2078965B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| WO1981003381A1 (en) | 1981-11-26 |
| DE3148640T1 (de) | 1982-07-29 |
| DE3148640C2 (en]) | 1991-05-16 |
| US4496904A (en) | 1985-01-29 |
| GB2078965A (en) | 1982-01-13 |
| GB2078965B (en) | 1984-05-31 |
| JPS57500664A (en]) | 1982-04-15 |
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