DE3106803A1 - Automatic image evaluation method for magnetic crack testing - Google Patents
Automatic image evaluation method for magnetic crack testingInfo
- Publication number
- DE3106803A1 DE3106803A1 DE19813106803 DE3106803A DE3106803A1 DE 3106803 A1 DE3106803 A1 DE 3106803A1 DE 19813106803 DE19813106803 DE 19813106803 DE 3106803 A DE3106803 A DE 3106803A DE 3106803 A1 DE3106803 A1 DE 3106803A1
- Authority
- DE
- Germany
- Prior art keywords
- image
- fluorescence images
- fluorescence
- magnetic
- magnetic crack
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/91—Investigating the presence of flaws or contamination using penetration of dyes, e.g. fluorescent ink
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
Abstract
Description
Automatisches Bildauswerteverfahren für Automatic image evaluation process for
die Magnetrißprüfung Die Erfindung betrifft ein automatisches Verfahren zur Auswertung von Fluoreszenzbildern bei der Prüfung von ferromagnetischen Werkstücken; durch die Automatisierung der Bildauswertung wird die Sicherheit der Prüfung erhöht. Magnetic crack testing The invention relates to an automatic method for evaluating fluorescence images when testing ferromagnetic workpieces; the automation of the image evaluation increases the security of the test.
Ein weitverbreitetes Verfahren zur Prüfung von ferromagnetischen Werkstoffen, insbesondere von Schmiedeteilen, auf Oberflächenrisse macht von der Tatsache Gebrauch, daß ein von außen an das Werkstück angelegtes Magnetfeld an den Rissen ein inhomogenes Streufeld erzeugt. Man benetzt das Werkstück mit einer Flüssigkeit, in der fein verteilte ferromagnetische Partikel und daran angelagert eine durch ultraviolettes Licht zu Fl uoreszenz im sichtbaren Teil des Spektrums anregbare Substanz enthalten ist; die Flüssigkeit sammelt sich bevorzugt an den Rissen. Durch Beleuchtung mit einer UV-Lampe können so die Risse für den menschlichen Beobachter sichtbar gemacht werden.A widely used method for testing ferromagnetic materials, especially of forgings, on surface cracks makes use of the fact that an externally applied magnetic field to the workpiece creates an inhomogeneous field at the cracks Stray field generated. The workpiece is wetted with a liquid in which the fine distributed ferromagnetic particles and attached to them one by ultraviolet Light to fluorescence in the visible part of the spectrum contain excitable substance is; the liquid preferentially collects at the cracks. By lighting with A UV lamp can thus make the cracks visible to the human observer will.
Die Automatisierung der Auswertung des Fluoreszenzbildes, aber auch die visuelle Auswertung durch den Menschen, wird durch Störungen sehr erschwert, die dadurch hervorgerufen werden, daß die Flüssigkeit nicht nur an Rissen, sondern auch an unschädlichen Verschmutzungen, an Rost oder an Graten hängenbleibt und bei der UV-Bestrahlung zu Fluoreszenz führt.But also the automation of the evaluation of the fluorescence image the visual evaluation by humans is made very difficult by disturbances, which are caused by the fact that the liquid not only cracks, but also gets stuck on harmless dirt, rust or burrs and with UV radiation leads to fluorescence.
Die Erfindung gibt einen Weg an, mit der die durch Risse und die durch sonstige Störungen verursachten Fluoreszenzstellen unterschieden werden können.The invention provides a way with which through cracks and through other interferences caused fluorescence points can be distinguished.
Das erfindungsgemäße Verfahren bildet die Differenz der Helligkeiten jedes einzelnen Bildpunktes zweier zeitlich nacheinander aufgenommener Bilder. Das erste Bild des fluoreszierenden Werkstückes wird mit einer Fernsehkamera oder einer anderen Aufnahmeeinrichtung abgetastet nach der Benetzung durch die fluoreszierende Flüssigkeit, jedoch vor Anlegen des Magnetfeldes. Als fluoreszierende Stellen erscheinen alle Bereiche des Werkstückes mit unschädlichen Störungen. Das Bild wird in einem Bildspeicher, beispielsweise nach A-D-Wandlung der Helligkeitswerte der einzelnen Bildpunkte, in einem digitalen Bildspeicher, abgelegt. Nach diesem kurzdauernden Vorgang wird das Magnetfeld an das Werkstück angelegt. Das zweite Bild wird kurzzeitig nach Anlegen des Magnetfeldes von der gleichen Aufnahmeeinrichtung abgetastet und in einem 2. Speicher ebenfalls abgelegt. Im zweiten Bild sind neben den unveränderten unschädlichen Störungen die zu detektierenden Risse enthalten.The method according to the invention forms the difference between the brightnesses of every single pixel of two consecutive images. That The first image of the fluorescent workpiece is taken with a television camera or a other recording device scanned after wetting by the fluorescent Liquid, but before the magnetic field is applied. Appear as fluorescent spots all areas of the workpiece with harmless faults. The picture is in one Image memory, for example after A-D conversion of the brightness values of the individual Image points, stored in a digital image memory. After this short-lived During the process, the magnetic field is applied to the workpiece. The second picture is momentary after application of the magnetic field scanned by the same recording device and also stored in a second memory. In the second picture are next to the unchanged harmless disturbances contain the cracks to be detected.
Bildet man nun die Differenz der Helligkeit der einzelnen Punkte beider Bilder, beispielsweise durch einen Digitalrechner, der zu den beiden Speichern Zugriff hat, so bleibt nur ein Bild mit den schädlichen Rissen übrig.If one now forms the difference in the brightness of the individual points of the two Images, for example by a digital computer that has access to the two memories only a picture with the damaging cracks remains.
Die Verwendung eines 2. Speichers kann vermieden werden, wenn während der 2. Bildabtastung jeder Bildpunkt des zuvor aufgenommenen Bildes im richtigen Zeitpunkt aus dem Speicher abgerufen wird, ein Rechenwerk die Differenz der Helligkeiten bildet und die Differenz an der zugehörigen Stelle des Speichers wieder ablegt. Zur Differenzbildung ist auch eine analoge Speicherung der beiden Bilder mit speziellen Bildspeicherröhren geeignet.The use of a 2nd memory can be avoided if during the 2nd image scanning every pixel of the previously recorded image in the correct one Time is retrieved from the memory, an arithmetic unit calculates the difference in brightness forms and stores the difference again in the associated location of the memory. Analog storage of the two images with special Image storage tubes suitable.
Die anschließende automatische Verarbeitung des Differenzbildes nach Form, Ausdehnung und Lage der Risse erfolgt mit den bekannten Verfahren der automatischen Bildverarbeitung.The subsequent automatic processing of the difference image The shape, extent and position of the cracks are carried out using the known automatic methods Image processing.
Bei dem erfindungsgemäßen Verfahren kann anstelle der Beleuchtung durch UV-Licht und der anschließenden Abtastung einander aufgenommenen Fluoreszenzbilder mit analogen Bildspeichern, beispielsweise mit Bildspeicherröhren, erfolgt.In the method according to the invention, instead of lighting by UV light and the subsequent scanning recorded each other Fluorescence images with analog image memories, for example with image storage tubes, he follows.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19813106803 DE3106803A1 (en) | 1981-02-24 | 1981-02-24 | Automatic image evaluation method for magnetic crack testing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19813106803 DE3106803A1 (en) | 1981-02-24 | 1981-02-24 | Automatic image evaluation method for magnetic crack testing |
Publications (1)
Publication Number | Publication Date |
---|---|
DE3106803A1 true DE3106803A1 (en) | 1982-09-09 |
Family
ID=6125604
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19813106803 Ceased DE3106803A1 (en) | 1981-02-24 | 1981-02-24 | Automatic image evaluation method for magnetic crack testing |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE3106803A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3636836A1 (en) * | 1985-10-29 | 1987-05-14 | Bruss Polt I | METHOD AND DEVICE FOR MAGNETOGRAPHIC EXAMINATION OF THE MATERIAL GOODS |
DE3602395A1 (en) * | 1986-01-28 | 1987-07-30 | Tiede Gmbh & Co Risspruefanlagen | Self-checking of an optoelectronic crack detection device |
EP0309758A2 (en) * | 1987-09-23 | 1989-04-05 | Isotopen-Technik Dr. Sauerwein Gmbh | Procedure and facility for determination and evaluation of surface cracks on workpieces |
ES2108617A1 (en) * | 1994-11-17 | 1997-12-16 | Tecnologico Robotiker Centro | Procedure and machine for automatically detecting cracks in iron parts. |
DE102007024060A1 (en) * | 2007-05-22 | 2008-11-27 | Illinois Tool Works Inc., Glenview | Apparatus and method for test equipment control |
DE102007024058A1 (en) * | 2007-05-22 | 2008-11-27 | Illinois Tool Works Inc., Glenview | Apparatus and method for test equipment control |
-
1981
- 1981-02-24 DE DE19813106803 patent/DE3106803A1/en not_active Ceased
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3636836A1 (en) * | 1985-10-29 | 1987-05-14 | Bruss Polt I | METHOD AND DEVICE FOR MAGNETOGRAPHIC EXAMINATION OF THE MATERIAL GOODS |
DE3602395A1 (en) * | 1986-01-28 | 1987-07-30 | Tiede Gmbh & Co Risspruefanlagen | Self-checking of an optoelectronic crack detection device |
EP0309758A2 (en) * | 1987-09-23 | 1989-04-05 | Isotopen-Technik Dr. Sauerwein Gmbh | Procedure and facility for determination and evaluation of surface cracks on workpieces |
EP0309758A3 (en) * | 1987-09-23 | 1990-03-07 | Kurt Dr. Sauerwein | Procedure and facility for determination and evaluation of surface cracks on workpieces |
ES2108617A1 (en) * | 1994-11-17 | 1997-12-16 | Tecnologico Robotiker Centro | Procedure and machine for automatically detecting cracks in iron parts. |
DE102007024060A1 (en) * | 2007-05-22 | 2008-11-27 | Illinois Tool Works Inc., Glenview | Apparatus and method for test equipment control |
DE102007024058A1 (en) * | 2007-05-22 | 2008-11-27 | Illinois Tool Works Inc., Glenview | Apparatus and method for test equipment control |
WO2008147702A1 (en) * | 2007-05-22 | 2008-12-04 | Illinois Tool Works Inc. | Device and method for controlling test material |
US8922642B2 (en) | 2007-05-22 | 2014-12-30 | Illinois Tool Works Inc. | Device and method for controlling test material |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8110 | Request for examination paragraph 44 | ||
8131 | Rejection |