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- 2012 (17) (entfernen)
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- Beitrag zu einem Tagungsband (9)
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- Active thermography (4)
- Thermography (4)
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Eingeladener Vortrag
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Anwendungsbereiche und Grenzen der Blitzthermografie - Entwicklung eines anwendungsnahen Standards
(2012)
Anwendungsbreiche und Grenzen der Blitzthermografie - Entwicklung eines anwendungsnahen Standards
(2012)
Untersuchungen zur 2D- und 3D-Rekonstruktion von Rückwandgeometrien in der Impuls-Thermografie
(2012)
Impulse and lock-in thermography have been applied to detect delaminations of prototype solder joints, similar to those to be produced between Cu shunts and Cu busbar stabilisers at the Large Hadron Collider (LHC) at CERN. Two infrared cameras with different detector materials and with different spectral ranges and two excitation techniques have been tested and compared for their ability to detect delaminations behind 2 and 3 mm thick Cu shunts. We have analyzed the signal to noise ratio (SNR) for each detected defect and are able to detect defects down to a nominal edge length of 4 mm behind 2 mm thick Cu shunts by using fast impulse thermography and a camera with a microbolometer array. For the 3 mm thick Cu shunt, on the other hand, the nominal 4 mm defect is only visible in the lock-in thermography phase images and the highest SNR has been achieved with a cooled InSb-based camera. In addition, numerical simulations show the influence of the minimum detectable defect size on the shunt thickness and that the developed on-site testing technique is sufficient to find all defects that are detectable theoretically.
In this contribution, the authors present the results of a project which involves the
development of a testing standard for flash thermography. In addition to the standardization of
the selection of appropriate equipment and procedures for testing and data analysis, the new
standard will provide suitable reference test specimens for several materials, including CFRP
as used in aerospace applications with typical flaws. We will particularly consider these test
specimens which should enable qualification of the equipment as well as the validation of the
flash thermography method for CFRP in general.