EP2300810A1 - Verfahren und vorrichtung zur scannenden induktionsthermographie mit flexiblem bewegungspfad - Google Patents
Verfahren und vorrichtung zur scannenden induktionsthermographie mit flexiblem bewegungspfadInfo
- Publication number
- EP2300810A1 EP2300810A1 EP09779528A EP09779528A EP2300810A1 EP 2300810 A1 EP2300810 A1 EP 2300810A1 EP 09779528 A EP09779528 A EP 09779528A EP 09779528 A EP09779528 A EP 09779528A EP 2300810 A1 EP2300810 A1 EP 2300810A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- image
- test part
- inductor
- infrared camera
- relative movement
- 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.)
- Ceased
Links
- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000006698 induction Effects 0.000 title claims abstract description 30
- 238000001931 thermography Methods 0.000 title claims abstract description 21
- 238000012360 testing method Methods 0.000 claims abstract description 49
- 239000000463 material Substances 0.000 claims abstract description 7
- 238000011156 evaluation Methods 0.000 claims description 16
- 238000004458 analytical method Methods 0.000 claims description 6
- 238000013459 approach Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 3
- 238000003702 image correction Methods 0.000 claims description 3
- 238000013519 translation Methods 0.000 claims description 3
- 230000002950 deficient Effects 0.000 claims description 2
- 230000000873 masking effect Effects 0.000 claims description 2
- 230000001066 destructive effect Effects 0.000 abstract description 2
- 230000007547 defect Effects 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/72—Investigating presence of flaws
Definitions
- the present invention relates to a method and an apparatus for induction thermography for nondestructive material examination.
- Induction thermography is a process for non-destructive material investigation.
- a current in the electrically conductive test object is induced by an alternating current flowing in a coil, the so-called inductor.
- FIG. 1a If a component has a crack, the current flowing through the test object must flow around such a crack. This is shown in FIG. 1b. Due to the increased current density, the test object is heated more strongly at the crack. This is detectable with an infrared camera. This is illustrated in FIG. 1c. Only a narrow area in the vicinity of the inductor is heated. This is Figure Id dar. Therefore, for a complete test of large or complex shaped components many individual investigations must be carried out.
- test piece For defects that lie inside a material, the test piece is moved during the measurement, synchronized with the frequency of the camera. The test piece is shifted by one pixel per camera image. Such a method is shown in FIG. 2.
- the induction generator works in continuous wave mode. To reconstruct an image, the data is resorted. The evaluation finally takes place by subtracting the zero image or by fitting a polynomial of the sixth degree and then evaluating the first or second derivative.
- [2] discloses a method in which a test piece is positioned in front of a set of inductors and the individual points are excited in succession. In this way, even complex objects can be tested, but due to the use of multiple inductors, the process is very complex.
- the object is achieved by a method according to the main claim and a device according to the independent claim.
- a frame is generated each time the test piece is moved by a length corresponding to the projected pixel width.
- the relative movement of the inspection part to an infrared camera having an inductor is provided such that the relative movement for image recording with the infrared camera is uncoupled and / or free. In this way, large areas of a component can be large
- Speed can be easily examined.
- the test piece is moved along any one- or multi-dimensional path. Any part of the test piece can be heated. Either the infrared camera and the inductor remain stationary, or the camera is moved along with the inductor, leaving the sample stationary.
- equally larger or complex shaped test parts can be quickly checked for errors. The time and effort required for the exam are significantly reduced and an easily interpretable result picture is obtained. In this way, a documentation of the results is easily possible. Furthermore, the evaluation makes it possible to evaluate the result automatically as well.
- the relative movement is carried out by means of displacement tables for an x, a y and / or a z-direction.
- the relative movement is carried out by means of a conveyor, for example a conveyor belt or roller belt.
- the relative movement takes place by means of a device for rotating a rotationally symmetrical test part.
- the relative movement is carried out by means of a robot.
- an induction generator is operated in continuous wave mode.
- a warm-up occurring during an approach of the inductor and / or a cooling down after passing through the inductor of a location of the test part are recorded with the infrared camera, two or more images being recorded at a time.
- a sorting of the camera data adapted to a path and to a speed takes place in such a way that a point of a series of results of a temporal course of the temperature corresponds to a point of the test part.
- a single image is generated from the result series.
- a result can be displayed as a picture.
- zero-image correction or pulse-phase analysis evaluation algorithms are used. Possible evaluation algorithms are zero-image correction or pulse-phase analysis, especially when using the phase image, which suppresses differences in emissivity and differences in the current density distribution.
- a masking out of image areas takes place without information.
- image areas arise, for example, in that they are covered by the inductor.
- suppression of caused by the shape of the test part geometry effects by subtracting an image sequence of an intact test part of an image of a defective test part or by subtracting these two result images after evaluation by a pulse-phase analysis.
- geometry effects for example due to grooves or channels, can be th, by subtracting a sequence of a good part or by the subtraction of the two result images, after the evaluation by, for example, the pulse-phase analysis can be suppressed. In this way, defects are easier to recognize.
- a result image is stored for malicious documentation.
- a result image produced by subtracting a sequence of a good part or by subtracting result images can be finally stored for malicious documentation.
- This is a point by point approach. So there is another way to do the sample, to take a picture at this point, to evaluate this data with the methods mentioned above and finally to move the sample to the next position. In this way, it is also possible to obtain a result image for the entire test part by superimposing the result images.
- an online evaluation takes place during a recording.
- an online evaluation is also possible during a recording.
- an automatic evaluation takes place. It is also possible to automatically evaluate a result by an online or offline evaluation.
- the present invention will be described in more detail by means of exemplary embodiments in conjunction with the figures. Show it
- Figure 2 shows an embodiment of a conventional device for induction thermography
- Figure 3a shows a first embodiment of an inventive device for induction thermography
- FIG. 3b shows a second embodiment of a device according to the invention for induction thermography
- FIG. 3c shows a third embodiment of a device according to the invention for induction thermography
- Figure 3d shows a fourth embodiment of an inventive device for induction thermography.
- FIG. 1a, 1b, 1c and 1d illustrate the mode of operation of induction thermography.
- FIG. 1a shows by reference numeral 1 an inductor or a coil through which an alternating current flows.
- Reference numeral 2 denotes the induced currents.
- Reference numeral 3 denotes the alternating current.
- the alternating current 3, which flows in the coil or in the inductor 1, induces a current in the electrically conductive test object.
- FIG. 1b shows by reference numeral 4 a region with increased current density due to a crack in the test object. This causes increased heat generation at the crack tip. That is, if a component contains a crack, the current flowing through the test object must flow around the crack.
- FIG. 1c denotes the area with increased current density, which leads to increased heat generation at the crack tip.
- Reference numeral 5 denotes an infrared camera. Due to the increased current density, the test object is heated more strongly at the crack, which is detectable with the infrared camera 5.
- FIG. 1 d shows a representation of the current density as a function of the distance y.
- Figure 2a shows an embodiment of a conventional induction thermography apparatus according to [I].
- Reference numeral 5 denotes an infrared camera
- reference numeral 6 an induction generator with inductor
- reference numeral 7 denotes a test part
- reference numeral 8 denotes a holder for the test piece
- Reference numeral 9 denotes a translation stage.
- FIG. 3 a shows a first exemplary embodiment of an induction thermography apparatus according to the invention.
- Reference numeral 5 denotes an infrared camera
- reference numeral 6 an induction generator with inductor
- reference numeral 7 a test part.
- Reference numeral 8 denotes a holder for the test piece.
- Reference numeral 10 denotes a displacement table for an x-direction.
- Reference numeral 11 denotes a shift table for a y-direction.
- Reference numeral 12 denotes a translation table for a z-direction.
- Figure 3b shows a second embodiment of an inventive device for induction thermography.
- reference numeral 5 denotes an infrared camera
- reference numeral 6 an induction generator with inductor
- reference numeral 7th a test part.
- Reference numeral 13 denotes a conveyor belt or a roller belt.
- FIG. 3c illustrates a third exemplary embodiment of an induction thermography apparatus according to the invention.
- Reference numeral 5 denotes an infrared camera.
- Reference numeral 6 an induction generator with inductor.
- Reference numeral 14 denotes means for rotating the inspection part.
- the test part is designated by the reference numeral 7.
- FIG. 3d shows a fourth exemplary embodiment of a device according to the invention for induction thermography.
- a test part 7 is positioned by means of a robot 15.
- Reference numeral 5 denotes an infrared camera.
- Reference numeral 6 denotes an induction generator with inductor.
- Reference numeral 8 denotes a holder for the test piece.
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Radiation Pyrometers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102008034162A DE102008034162B4 (de) | 2008-07-22 | 2008-07-22 | Verfahren und Vorrichtung zur scannenden Induktionsthermographie mit flexiblem Bewegungspfad |
| PCT/EP2009/056233 WO2010009918A1 (de) | 2008-07-22 | 2009-05-22 | Verfahren und vorrichtung zur scannenden induktionsthermographie mit flexiblem bewegungspfad |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP2300810A1 true EP2300810A1 (de) | 2011-03-30 |
Family
ID=41110704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP09779528A Ceased EP2300810A1 (de) | 2008-07-22 | 2009-05-22 | Verfahren und vorrichtung zur scannenden induktionsthermographie mit flexiblem bewegungspfad |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20120002036A1 (de) |
| EP (1) | EP2300810A1 (de) |
| DE (1) | DE102008034162B4 (de) |
| WO (1) | WO2010009918A1 (de) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8527215B2 (en) | 2009-05-15 | 2013-09-03 | Siemens Energy, Inc. | Automated inspection system and method for nondestructive inspection of a workpiece using induction thermography |
| EP2386850A3 (de) * | 2010-05-13 | 2011-12-21 | Siemens Energy, Inc. | Automatisches Prüfsystem und Verfahren zur nicht destruktiven Prüfung eines Werkstücks mithilfe der Induktionsthermografie |
| FR2972052B1 (fr) * | 2011-02-25 | 2014-01-10 | Peugeot Citroen Automobiles Sa | Dispositif de test de fatigue thermique pour piston de moteur thermique et procede de test associe |
| DE102011114547B4 (de) * | 2011-09-30 | 2014-03-20 | INPRO Innovationsgesellschaft für fortgeschrittene Produktionssysteme in der Fahrzeugindustrie mbH | Verfahren und Vorrichtung zum zerstörungsfreien Prüfen von Fügeverbindungen wie eines Schweißpunktes eines gefügten Bauteils auf Oberflächenfehler und/oder innere Fehler mittels Thermografie |
| US10152784B2 (en) * | 2016-06-30 | 2018-12-11 | General Electric Company | System and method for detecting defects in a component |
| WO2019033043A2 (en) | 2017-08-11 | 2019-02-14 | Genentech, Inc. | ANTI-CD8 ANTIBODIES AND USES THEREOF |
| US11587148B2 (en) | 2021-03-08 | 2023-02-21 | Capital One Services, Llc | Item level data determination device, method, and non-transitory computer-readable media |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6478138A (en) * | 1987-09-21 | 1989-03-23 | Jgc Corp | Inspecting device for soundness of drum packed with radioactive waste |
| US7033840B1 (en) * | 1999-11-09 | 2006-04-25 | Sri International | Reaction calorimeter and differential scanning calorimeter for the high-throughput synthesis, screening and characterization of combinatorial libraries |
| US7724925B2 (en) * | 1999-12-02 | 2010-05-25 | Thermal Wave Imaging, Inc. | System for generating thermographic images using thermographic signal reconstruction |
| EP1334351A1 (de) * | 2000-10-16 | 2003-08-13 | Philip Morris Products Inc. | Thermographisches inspektionssystem |
| DE10153591A1 (de) * | 2001-11-02 | 2003-05-22 | Rene Baltus | Wiedererkennung einer Person durch die Erfassung und dem Vergleich der personentypischen Betätigungsdynamik an einem Joystick |
| US20050207468A1 (en) * | 2004-03-16 | 2005-09-22 | Mccullough Robert W | Inductively heated transient thermography method and apparatus for the detection of flaws |
| US7553670B2 (en) * | 2004-04-28 | 2009-06-30 | 3M Innovative Properties Company | Method for monitoring a polymerization in a three-dimensional sample |
| GB2442744B (en) * | 2006-10-12 | 2009-07-08 | Rolls Royce Plc | A test apparatus and method |
| US20090204008A1 (en) * | 2008-02-08 | 2009-08-13 | Daniel Beilin | Whole body infrared thermography systems and methods |
-
2008
- 2008-07-22 DE DE102008034162A patent/DE102008034162B4/de not_active Expired - Fee Related
-
2009
- 2009-05-22 US US13/003,887 patent/US20120002036A1/en not_active Abandoned
- 2009-05-22 WO PCT/EP2009/056233 patent/WO2010009918A1/de not_active Ceased
- 2009-05-22 EP EP09779528A patent/EP2300810A1/de not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2010009918A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US20120002036A1 (en) | 2012-01-05 |
| DE102008034162B4 (de) | 2013-03-28 |
| DE102008034162A1 (de) | 2010-02-04 |
| WO2010009918A1 (de) | 2010-01-28 |
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