SE7609913L - KIT AND DEVICE FOR NON-LARGE TEST BY FOUCAULT CURRENTS - Google Patents
KIT AND DEVICE FOR NON-LARGE TEST BY FOUCAULT CURRENTSInfo
- Publication number
- SE7609913L SE7609913L SE7609913A SE7609913A SE7609913L SE 7609913 L SE7609913 L SE 7609913L SE 7609913 A SE7609913 A SE 7609913A SE 7609913 A SE7609913 A SE 7609913A SE 7609913 L SE7609913 L SE 7609913L
- Authority
- SE
- Sweden
- Prior art keywords
- circuit
- signal
- signals
- probe
- frequency
- Prior art date
Links
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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2265/00—Safety or protection arrangements; Arrangements for preventing malfunction
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)
Abstract
1521203 Eddy current testing COMMISSARIAT A L'ENERGIE ATOMIQUE 8 Sept 1976 [9 Sept 1975] 37174/76 Heading G1N The invention relates to a process and apparatus for eddy current testing of objects wherein a part of the initial signal produced in the process or apparatus is eliminated, the part being due to a parameter or parameters of the object. The process comprises the steps of displacing a probe 12 in the proximity of the object, supplying the probe with an excitation current of n different frequencies as from oscillators 26, 28 and analyzing the components of each of the n frequencies in the signal provided by the probe. The analysis comprises for each component separating the resistive part in phase with the excitation current from the reactive part Y in quadrature. Parts X, Y of a component at a first frequency are then modified so that in the overall signal the part of the signal corresponding to a parameter to be eliminated is coincident and equal to the part of the signal corresponding to the parameter of a second frequency. The modified signal and signal at the second frequency are then subtracted to provide a signal corresponding solely to a fault. The signal produced by the subtraction is displayed as on a CRT 90. As shown the probe 12 comprises a bridge network of two resistances 18 and two inductances 20 the output at 24 being fed through a circuit comprising a pre-amp 34 or imbalance compensating circuit 36, an amplifier 42, two band pass filters 44, 46 each centred on one of the two frequencies respectively, amplifiers 48, 50, analyzing memory circuits 52, 54 receiving reference signals from respective oscillators 26, 28 and low pass filters 68, 70 to provide the respective resistive and reactive parts X A , Y A , X B , Y B . The last mentioned parts pass to the elimination circuit which comprises for each frequency a weighting circuit 80, 82 whereby the signals may be partly modified as stated above as by the employment of multipliers 80x, 80y, 82x, 82y. The phase of the partly modified signals from circuit 80 is then phase shifted in a dephasing circuit 84 from where the signals are fed to subtraction circuits 86, 88. A circuit 92 is interposed between the subtraction circuits 86, 88 and the CRT 90 such that the orientation of the signal displayed thereon may be adjusted. Switching means 94 may be provided such that signals at various points of the circuit may be applied to the CRT 90.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7527615A FR2324003A1 (en) | 1975-09-09 | 1975-09-09 | NON DESTRUCTIVE EDD CURRENT CONTROL PROCESS AND CORRESPONDING DEVICE, USING MULTI-FREQUENCY EXCITATION AND ALLOWING THE ELIMINATION OF CERTAIN PARAMETERS |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| SE7609913L true SE7609913L (en) | 1977-03-10 |
| SE418905B SE418905B (en) | 1981-06-29 |
Family
ID=9159766
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE7609913A SE418905B (en) | 1975-09-09 | 1976-09-08 | KIT FOR NON-MAGNIFICENT TESTING BY FOUCAULT FLOWS AND DEVICE IMPLEMENTATION |
Country Status (14)
| Country | Link |
|---|---|
| JP (1) | JPS602619B2 (en) |
| BE (1) | BE845928A (en) |
| BR (1) | BR7605858A (en) |
| CA (1) | CA1070766A (en) |
| DD (1) | DD126270A5 (en) |
| DE (1) | DE2637201A1 (en) |
| ES (1) | ES451374A1 (en) |
| FI (1) | FI59302C (en) |
| FR (1) | FR2324003A1 (en) |
| GB (1) | GB1521203A (en) |
| IT (1) | IT1074264B (en) |
| NL (1) | NL184387C (en) |
| SE (1) | SE418905B (en) |
| ZA (1) | ZA764982B (en) |
Families Citing this family (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2428234A1 (en) * | 1978-06-07 | 1980-01-04 | Tornbloms Kvalitetskontroll Ab | Non-destructive electrically conducting material testing - using magnetic fields of different fields and variable control signal detector (SW 3.7.78) |
| FR2443682A1 (en) * | 1978-12-07 | 1980-07-04 | Commissariat Energie Atomique | CIRCUIT FOR AUTOMATIC CORRECTION OF A SIGNAL TRANSMITTED BY AN IMBALANCE DIFFERENTIAL SENSOR |
| US4292589A (en) * | 1979-05-09 | 1981-09-29 | Schlumberger Technology Corporation | Eddy current method and apparatus for inspecting ferromagnetic tubular members |
| US4303885A (en) * | 1979-06-18 | 1981-12-01 | Electric Power Research Institute, Inc. | Digitally controlled multifrequency eddy current test apparatus and method |
| US4467281A (en) * | 1980-02-29 | 1984-08-21 | Electric Power Research Institute, Inc. | Multi frequency eddy current test apparatus with intermediate frequency processing |
| US4424486A (en) * | 1980-10-14 | 1984-01-03 | Zetec, Inc. | Phase rotation circuit for an eddy current tester |
| JPS5791058U (en) * | 1980-11-25 | 1982-06-04 | ||
| JPS5817354A (en) * | 1981-06-12 | 1983-02-01 | Kobe Steel Ltd | Inspection of pipe material by multifrequency eddy current flaw detection |
| JPS58137748A (en) * | 1982-02-12 | 1983-08-16 | Ishikawajima Harima Heavy Ind Co Ltd | Eddy current examination method |
| DE3313820A1 (en) * | 1983-04-16 | 1984-10-18 | Institut Dr. Friedrich Förster Prüfgerätebau GmbH & Co KG, 7410 Reutlingen | DEVICE FOR TESTING THE SURFACE OF A METAL TEST PART |
| CA1212997A (en) * | 1983-12-16 | 1986-10-21 | Gerard Durou | Frequency scanning eddy current non destructive testing method and system |
| FR2562668B1 (en) * | 1984-04-05 | 1987-11-27 | Sncf | DEVICE FOR TRACKING DEFECTS OF RAILWAY RAILS BY EDGE CURRENTS, CAPABLE OF DISCRIMINATING DEFECTS OF CERTAIN DISCONTINUITIES IN RAIL CONSTRUCTION |
| JPS60262052A (en) * | 1984-06-08 | 1985-12-25 | Sumitomo Metal Ind Ltd | Heterogeneous material discrimination |
| JPS6273158A (en) * | 1985-09-27 | 1987-04-03 | Daizaburo Iwasaki | Signal processing method and apparatus in eddy current flaw detection test |
| JPS62255863A (en) * | 1986-04-28 | 1987-11-07 | Furukawa Electric Co Ltd:The | Eddy current flaw detector |
| SE456864B (en) * | 1986-08-27 | 1988-11-07 | Toernbloms Kvalitetskontroll | DEVICE FOR DETECTING AND SUPPRESSING THE IMPACT OF INTERNATIONAL MAGNETIC FIELD DURING THE VERTICAL FLOW TEST OF OMAGNETIC PROVOBJECTS |
| FR2627862A1 (en) * | 1988-02-26 | 1989-09-01 | Commissariat Energie Atomique | IMPULSIVE FOUCAULT CURRENT MONITORING METHOD AND DEVICE FOR IMPLEMENTING THE SAME |
| US5017869A (en) * | 1989-12-14 | 1991-05-21 | General Electric Company | Swept frequency eddy current system for measuring coating thickness |
| FR2724019B1 (en) * | 1994-08-31 | 1997-04-30 | Intercontrole Sa | METHOD OF DIGITAL ANALYSIS OF A SIGNAL, IN PARTICULAR FOR EDGE CURRENT CONTROL |
| FR2758882B1 (en) * | 1997-01-27 | 1999-04-09 | Intercontrole Sa | METHOD OF NON-DESTRUCTIVE MONITORING BY EDGE CURRENTS OF NUCLEAR REACTOR CONTROL CLUSTERS IN THE PRESENCE OF DISTURBING ELEMENTS |
| US6815957B2 (en) | 2001-09-24 | 2004-11-09 | Alstom (Switzerland) Ltd | Method and device for inspecting laminated iron cores of electrical machines for interlamination shorts |
| EP1430297B1 (en) * | 2001-09-24 | 2006-06-14 | ALSTOM Technology Ltd | Method and device for controlling laminated steel sheet stacks of electrical machines in a view to detect steel sheet short-circuits |
| JP4762672B2 (en) * | 2005-10-27 | 2011-08-31 | 非破壊検査株式会社 | Magnetic material bending portion fracture inspection method and inspection apparatus |
| CZ306012B6 (en) * | 2014-09-03 | 2016-06-22 | Vysoké Učení Technické V Brně | Non-destructive indicator of local subsurface non-homogeneities |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3706029A (en) * | 1971-11-16 | 1972-12-12 | Atomic Energy Commission | Multiple parameter eddy current nondestructive testing device using plural transformation rotators to resolve each parameter |
-
1975
- 1975-09-09 FR FR7527615A patent/FR2324003A1/en active Granted
-
1976
- 1976-08-18 DE DE19762637201 patent/DE2637201A1/en active Granted
- 1976-08-19 ZA ZA764982A patent/ZA764982B/en unknown
- 1976-08-27 CA CA260,058A patent/CA1070766A/en not_active Expired
- 1976-08-30 IT IT69113/76A patent/IT1074264B/en active
- 1976-08-31 NL NLAANVRAGE7609666,A patent/NL184387C/en not_active IP Right Cessation
- 1976-09-03 BR BR7605858A patent/BR7605858A/en unknown
- 1976-09-08 SE SE7609913A patent/SE418905B/en not_active IP Right Cessation
- 1976-09-08 FI FI762581A patent/FI59302C/en not_active IP Right Cessation
- 1976-09-08 GB GB37174/76A patent/GB1521203A/en not_active Expired
- 1976-09-08 BE BE170414A patent/BE845928A/en not_active IP Right Cessation
- 1976-09-09 DD DD194716A patent/DD126270A5/xx unknown
- 1976-09-09 JP JP51108390A patent/JPS602619B2/en not_active Expired
- 1976-09-09 ES ES451374A patent/ES451374A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DD126270A5 (en) | 1977-07-06 |
| DE2637201A1 (en) | 1977-03-17 |
| FR2324003B1 (en) | 1979-03-02 |
| NL184387C (en) | 1989-07-03 |
| IT1074264B (en) | 1985-04-20 |
| DE2637201C2 (en) | 1987-10-08 |
| SE418905B (en) | 1981-06-29 |
| JPS602619B2 (en) | 1985-01-23 |
| ZA764982B (en) | 1977-07-27 |
| CA1070766A (en) | 1980-01-29 |
| FI59302C (en) | 1981-07-10 |
| BE845928A (en) | 1976-12-31 |
| FI762581A (en) | 1977-03-10 |
| ES451374A1 (en) | 1977-12-16 |
| FR2324003A1 (en) | 1977-04-08 |
| FI59302B (en) | 1981-03-31 |
| GB1521203A (en) | 1978-08-16 |
| JPS5233791A (en) | 1977-03-15 |
| BR7605858A (en) | 1977-08-16 |
| NL7609666A (en) | 1977-03-11 |
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| Date | Code | Title | Description |
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| NAL | Patent in force |
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