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167 Optical Infrared Thermography of CFRP with Artificial Defects: Performance of Various Post-Processing Techniques
* 1 , 1, 2 , 1 , 1 , 1 , 1
1  Department of Materials, Textiles and Chemical Engineering (MaTCh), Ghent University
2  SIM Program M3 DETECT-IV, Technologiepark-Zwijnaarde 935, B-9052 Zwijnaarde, Belgium


This paper treats an experimental study that focusses on optical infrared thermography for non-destructive testing of composites through lock-in and flash excitation. Different fiber reinforced plastics with various artificial defects have been investigated. Three different post-processing techniques are applied, namely fast Fourier transform (FFT), principal component analysis (PCA) and thermographic signal reconstruction (TSR). A comparison between the different excitation and post-processing methods is performed, and their strengths and weaknesses in detecting artificial defects in composites are evaluated and discussed.

Keywords: Non-destructive testing; CFRP; lock-in thermography; flash thermography; post-processing