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Improved defect detection with combined shearography and thermography

: Schmidt, Wolfgang

Präsentation urn:nbn:de:0011-n-2231388 (1.2 MByte PDF)
MD5 Fingerprint: c91171a18072313405f1c23ca13d4b64
Erstellt am: 18.12.2012

Dantec Dynamics:
ICAIM 2012, International Conference on Applications for Image Based Measurements : 6th - 7th of March 2012 in Ulm, Germany
Ulm: Dantec Dynamics, 2012
ISBN: 978-3-00-036870-7
27 Folien
International Conference on Applications for Image Based Measurements (ICAIM) <2012, Ulm>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer IPA ()
non-destructive testing; Multisensor; Multisensorsystem; Shearografie; Thermographie; zerstörungsfreie Prüfung

The requests on non-destructive testing methots are constantly growing because of efficient use of material properties. To fulfill those requests often not only one testing system is sufficient. Therefore a trend in non-destructive testing goes to multi-sensor systems. Because of the casual relation of thermal strain and heat flow through a test object a multi-sensor system of thermography and shearography offers high capability. With thermography singularities of the temperature field on the testing objects surface can be detected and with shearography it is possible to visualize the deformation gradient on the surface. Both methods are using energy which is driven into the testing object. Studies on carbon fibre laminate structures showed, that is possible to improve the rate of defect detection by using a multi-sensor system combination of active thermography and digital shearography with thermal excitation. The study also proved, that because of the redundance of the methods the confidence of defect detection would be higher, which offers new options for automatic defect detection i.e. by using neural network techniques.