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Erscheinungsjahr
- 2012 (2) (entfernen)
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- Beitrag zu einem Tagungsband (2) (entfernen)
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- Englisch (2)
Referierte Publikation
- nein (2) (entfernen)
Schlagworte
- Active thermography (1)
- Cracks (1)
- Flash lamp (1)
- Flying spot (1)
- Laser (1)
- Reference test specimen (1)
- Standardisation (1)
- Thermography (1)
We report on recent developments in the detection of surface breaking cracks using
flying laser spot thermography. Application of an infrared camera for mapping the
thermal radiation after excitation with a diode laser equipped with an optical scanner
allows us to examine a surface containing cracks in an entirely non-destructive,
contactless and fast way, without even moving the camera. We developed an efficient
and robust algorithm that can be applied directly to the recorded thermal sequences,
and that derives a single image containing all crack signatures. For this crack detection
technique, no specific synchronisation between laser and camera is required. Hence,
our approach is suitable for an upgrade of existing thermographic systems. The
feasibility of the proposed procedure is proven by testing an artificial test sample and a
piece of rail that comprises roll contact fatigue cracks and by comparing the results
with magnetic particle testing.