WO2004005912A2 - Verfahren zum erkennen und lokalisieren von materialfehlern mit abgleich von mess- und erregerspule - Google Patents
Verfahren zum erkennen und lokalisieren von materialfehlern mit abgleich von mess- und erregerspule Download PDFInfo
- Publication number
- WO2004005912A2 WO2004005912A2 PCT/EP2003/006443 EP0306443W WO2004005912A2 WO 2004005912 A2 WO2004005912 A2 WO 2004005912A2 EP 0306443 W EP0306443 W EP 0306443W WO 2004005912 A2 WO2004005912 A2 WO 2004005912A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signals
- measuring
- coil
- signal
- excitation coil
- Prior art date
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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
Definitions
- the present invention relates to a method for the detection and localization of material defects, in particular for longitudinal crack, longitudinal depth defect and point defect detection, wherein at least one excitation coil and at least one measuring coil interact with a material by means of eddy current testing.
- the excitation coil and the measuring coil can be the same coil.
- a continuous coil for example, is used to check a material to be tested, such as wires, rods, tubes, which is designed as a semi-finished product, for local cracks and hole-like defects.
- a non-destructive measurement is carried out using the eddy current method, which can be integrated into manufacturing processes.
- the material is usually replaced by a Continuous coil moves, and during the movement the material defects are localized by eddy current measurement.
- Another method shows that the surface of a material is scanned using eddy current probes.
- Moving or rotating sensors or probes are also known which move over a material in order to detect corresponding material defects.
- a disadvantage of conventional methods is that they are extremely complex in terms of equipment, in particular as far as so-called rotating probes are concerned. In most cases, conventional systems can also be installed in large volumes and therefore cannot be used everywhere.
- the present invention has for its object to provide a method of the type mentioned, which eliminates the disadvantages mentioned and with which an effective measuring method is created in a simple and inexpensive manner, which material defects even at high production speeds, integrated in the manufacturing process, for example as Detects and localizes longitudinal cracks, as longitudinal depth cracks and / or as point defects.
- the solution to this problem is that a signal from the measuring coil and a signal from the excitation coil are compared with one another.
- an excitation coil and at least one measuring coil are preferably combined in a single coil or probe, the signals from the measuring coil and excitation coil, which is connected to a voltage or current source, being compared with one another in a subtractor and / or adder , if there is no test material in the arrangement of the excitation coil and the measuring coil. Possibly. Before the signals from the excitation coil and the measuring coil are compared, these signals can be amplified to the same amplitude and / or brought to the same phase by means of a phase shifter.
- the subtractor and / or adder results in a measurement signal equal to zero or approximately zero if no material is in the effective range of the excitation and / or measurement coil.
- a digital signal processor takes over these tasks instead of subtractors and / or adders, possibly amplifiers or differential amplifiers and phase shifters and measuring amplifiers. It has also proven to be advantageous to transfer this resulting signal, which is evaluated, for example, in any evaluation unit for the detection and localization of the measurement errors, to a measuring device which again compares this measurement signal with another or the same comparison signal in the manner described above.
- the comparison signal can be, for example, an excitation voltage of the excitation coil or even a voltage of the measuring coil from the first stage, the second stage or a second adjustment taking place in the measuring device. In this way, even more sensitive measurement results can be achieved, so that material errors can be localized and recognized by means of the low measurement frequencies, which enables very high measurement depths.
- low or low measurement frequencies can be used to detect internal or deep-seated defects or structural changes.
- FIG. 1 shows a schematically illustrated top view of a first stage of a sequence of the measurement method according to the invention
- Figure 2 is a schematic plan view of a second stage of the measuring method according to the invention, in the measuring device.
- an excitation coil 1 which is only indicated here, is connected to a voltage source 2 in a measuring method for recognizing and localizing material errors, such as longitudinal cracks, longitudinal depth errors and point errors, whereby it should also be within the scope of the present invention to provide a plurality of excitation coils 1 , Several measuring coils and / or excitation coils can also be provided. This should also be within the scope of the present invention.
- At least one measuring coil 3 is provided, it being within the scope of the present invention that at least one excitation coil 1 and at least one measuring coil 3 form a single component.
- the material to be tested is moved through the measuring coil 3, or the measuring coil 3 is moved axially along the material or radially around the material, as is not shown here, so that corresponding measuring errors can be detected via the eddy currents that arise , It has proven to be particularly advantageous to carry out an adjustment of the coils, material-specific, diameter-specific, in that the signals Si, S 2 emanating from excitation coil 1 and measuring coil 3 are compared with one another in a subtractor 4 and / or adder 5 in order to obtain a measurement signal S. M to get.
- an amplifier 6 and / or a phase shifter 7 can be connected upstream of the subtractor 4 or adder 5 to adjust the phase.
- the subtractor 4 and / or adder 5 results in a measuring signal S m , which can be amplified by a measuring amplifier 8 in order to admit the material defects localize and process it further in a subsequent evaluation unit 9.
- the comparison of the signals Si, S 2 possibly an amplification of the amplitude and a phase shift and possibly a resulting amplification of the measurement signal S M takes place in a digital signal processor DSP.
- the signals from excitation coil 1 and measuring coil 3 may be digitized in the input and output area or further processed as an analog output signal.
- the measurement signal S M emanating from the first stage I is compared in the subtractor 4 and / or adder 5 with any comparison signal S v used depending on the measurement task, the subtractor 4 possibly being as described above and / or adders 5 one or more amplifiers 6 for amplifying the signals to the same amplitude and / or one or more phase shifters 7 for tuning the same phases of the measurement signal S M and the comparison signal S v are connected upstream, after a comparison of the comparison signal S v and measuring signal S M connects a measuring amplifier 8.
- a digital signal processor DSP can also be used. It is important here that the measurement signal S M is adjusted again from the first stage I to the second stage II in the measuring device 10 and as a comparison signal S v any signal, for example the exciter output voltage or the exciter input voltage from excitation coil 1 and / or measuring coil 3 or any other component is used to carry out the adjustment.
- the signals are digitized and can be output in analog or digitized form.
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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)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003281276A AU2003281276A1 (en) | 2002-07-02 | 2003-06-18 | Method for recognizing and locating material flaws with adjustment of measuring and exciter coils |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10229735.5 | 2002-07-02 | ||
DE2002129735 DE10229735A1 (de) | 2002-07-02 | 2002-07-02 | Verfahren zum Erkennen und Lokalisieren von Materialfehlern |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2004005912A2 true WO2004005912A2 (de) | 2004-01-15 |
WO2004005912A3 WO2004005912A3 (de) | 2004-05-13 |
Family
ID=29761581
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2003/006443 WO2004005912A2 (de) | 2002-07-02 | 2003-06-18 | Verfahren zum erkennen und lokalisieren von materialfehlern mit abgleich von mess- und erregerspule |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU2003281276A1 (de) |
DE (1) | DE10229735A1 (de) |
WO (1) | WO2004005912A2 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2677311A1 (de) * | 2011-02-18 | 2013-12-25 | Dainichi Machine And Engineering Co., Ltd. | Nichtdestruktive prüfvorrichtung mit einem magnetischen wechselfeld sowie verfahren für nichtdestruktive prüfungen |
Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3422346A (en) * | 1965-02-01 | 1969-01-14 | Republic Steel Corp | Eddy current inspection system |
US3875502A (en) * | 1973-05-24 | 1975-04-01 | Foerster Inst Dr Friedrich | Coil arrangement and circuit for eddy current testing |
US3916301A (en) * | 1974-05-20 | 1975-10-28 | Republic Steel Corp | Magnetic flaw detection apparatus |
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 |
US4303885A (en) * | 1979-06-18 | 1981-12-01 | Electric Power Research Institute, Inc. | Digitally controlled multifrequency eddy current test apparatus and method |
US4322683A (en) * | 1979-03-09 | 1982-03-30 | Commissariat A L'energie Atomique | Control apparatus for eddy current non-destructive testing using a digital compensating circuit |
US4495587A (en) * | 1981-12-08 | 1985-01-22 | Bethlehem Steel Corporation | Automatic nondestructive roll defect inspection system |
US4496904A (en) * | 1980-05-22 | 1985-01-29 | The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland | Eddy current measurement apparatus for non-destructive testing in the vicinity of a fastener |
US4564809A (en) * | 1981-06-30 | 1986-01-14 | Nukem Gmbh | Eddy current test method with degree of amplification selected in accordance with a compensation signal |
EP0370691A1 (de) * | 1988-11-16 | 1990-05-30 | Nnc Limited | Zerstörungsfreies Prüfverfahren mit Wirbelströmen |
EP0375366A2 (de) * | 1988-12-20 | 1990-06-27 | Loma Group Limited | Verfahren und Vorrichtung zur Bestimmung der Beschaffenheit oder einer Eigenschaft eines nichtmetallischen, leitfähigen Materials mit Hilfe eines elektromagnetischen Wechselfeldes |
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 |
FR2769986A1 (fr) * | 1997-10-22 | 1999-04-23 | Intercontrole Sa | Appareil de controle non destructif de pieces metalliques par courants de foucault |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57207858A (en) * | 1981-06-17 | 1982-12-20 | Nippon Steel Corp | Hot flaw detecting method of metallic material |
JPS6166958A (ja) * | 1984-09-10 | 1986-04-05 | Sumitomo Light Metal Ind Ltd | 絶対値式渦流探傷装置 |
JPH05249085A (ja) * | 1992-03-10 | 1993-09-28 | Sumitomo Metal Ind Ltd | 渦流探傷装置 |
-
2002
- 2002-07-02 DE DE2002129735 patent/DE10229735A1/de not_active Withdrawn
-
2003
- 2003-06-18 AU AU2003281276A patent/AU2003281276A1/en not_active Abandoned
- 2003-06-18 WO PCT/EP2003/006443 patent/WO2004005912A2/de not_active Application Discontinuation
Patent Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3422346A (en) * | 1965-02-01 | 1969-01-14 | Republic Steel Corp | Eddy current inspection system |
US3875502A (en) * | 1973-05-24 | 1975-04-01 | Foerster Inst Dr Friedrich | Coil arrangement and circuit for eddy current testing |
US3916301A (en) * | 1974-05-20 | 1975-10-28 | Republic Steel Corp | Magnetic flaw detection apparatus |
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 |
US4322683A (en) * | 1979-03-09 | 1982-03-30 | Commissariat A L'energie Atomique | Control apparatus for eddy current non-destructive testing using a digital compensating circuit |
US4303885A (en) * | 1979-06-18 | 1981-12-01 | Electric Power Research Institute, Inc. | Digitally controlled multifrequency eddy current test apparatus and method |
US4496904A (en) * | 1980-05-22 | 1985-01-29 | The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland | Eddy current measurement apparatus for non-destructive testing in the vicinity of a fastener |
US4564809A (en) * | 1981-06-30 | 1986-01-14 | Nukem Gmbh | Eddy current test method with degree of amplification selected in accordance with a compensation signal |
US4495587A (en) * | 1981-12-08 | 1985-01-22 | Bethlehem Steel Corporation | Automatic nondestructive roll defect inspection system |
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 |
EP0370691A1 (de) * | 1988-11-16 | 1990-05-30 | Nnc Limited | Zerstörungsfreies Prüfverfahren mit Wirbelströmen |
EP0375366A2 (de) * | 1988-12-20 | 1990-06-27 | Loma Group Limited | Verfahren und Vorrichtung zur Bestimmung der Beschaffenheit oder einer Eigenschaft eines nichtmetallischen, leitfähigen Materials mit Hilfe eines elektromagnetischen Wechselfeldes |
FR2769986A1 (fr) * | 1997-10-22 | 1999-04-23 | Intercontrole Sa | Appareil de controle non destructif de pieces metalliques par courants de foucault |
Non-Patent Citations (5)
Title |
---|
"Eddy Current Theory - Testing" HOCKING, [Online] 23. September 2002 (2002-09-23), XP002266950 Gefunden im Internet: <URL:http://www.hocking.com/theory_testing .htm> [gefunden am 2004-01-14] * |
PATENT ABSTRACTS OF JAPAN vol. 007, no. 064 (P-183), 17. März 1983 (1983-03-17) -& JP 57 207858 A (SHIN NIPPON SEITETSU KK;OTHERS: 01), 20. Dezember 1982 (1982-12-20) * |
PATENT ABSTRACTS OF JAPAN vol. 010, no. 232 (P-486), 12. August 1986 (1986-08-12) -& JP 61 066958 A (SUMITOMO LIGHT METAL IND LTD), 5. April 1986 (1986-04-05) * |
PATENT ABSTRACTS OF JAPAN vol. 018, no. 005 (P-1669), 7. Januar 1994 (1994-01-07) -& JP 05 249085 A (SUMITOMO METAL IND LTD), 28. September 1993 (1993-09-28) * |
R. BECKER, L. VON BERNUS, M. DISQUÉ, M. KR\NING, M. DALICHOW: "Low and Multi-Frequency Eddy Current Techniques Assure the Integrity of RPV Clad in Nuclear Power Plants" ANNUAL EPRI REACTOR PRESSURE VESSEL INSPECTION CONFERENCE, [Online] - Juni 1996 (1996-06) Seiten 1-14, XP002253475 Gefunden im Internet: <URL:http://www.qnetworld.com/pdfs/Mfec-1. pdf> [gefunden am 2003-09-04] * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2677311A1 (de) * | 2011-02-18 | 2013-12-25 | Dainichi Machine And Engineering Co., Ltd. | Nichtdestruktive prüfvorrichtung mit einem magnetischen wechselfeld sowie verfahren für nichtdestruktive prüfungen |
EP2677311A4 (de) * | 2011-02-18 | 2014-07-02 | Dainichi Machine And Engineering Co Ltd | Nichtdestruktive prüfvorrichtung mit einem magnetischen wechselfeld sowie verfahren für nichtdestruktive prüfungen |
US9453817B2 (en) | 2011-02-18 | 2016-09-27 | DAINICHI Machine and Engineering Co., Ltd. | Nondestructive inspection device using alternating magnetic field, and nondestructive inspection method |
Also Published As
Publication number | Publication date |
---|---|
AU2003281276A1 (en) | 2004-01-23 |
AU2003281276A8 (en) | 2004-01-23 |
DE10229735A1 (de) | 2004-01-22 |
WO2004005912A3 (de) | 2004-05-13 |
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