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Flash thermography of composites : evaluation of advanced post-processing approaches

Gaétan Poelman (UGent) , Saeid Hedayatrasa (UGent) , Joost Segers (UGent) , Wim Van Paepegem (UGent) and Mathias Kersemans (UGent)
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Abstract
Carbon fiber reinforced polymers (CFRP) are composite materials that offer a high stiffness-to-weight ratio in comparison to traditional metals, which explains their increasing use in many high-end applications (e.g. aerospace). However, composites are prone to internal damage that may deteriorate the structural integrity, and thus require reliable and non-destructive testing (NDT) approaches. Infrared thermography (IRT) is a promising NDT technique which provides fast, full-field measurements, and in which hidden defects are detectable based on their thermal signatures. In flash thermography (FT), which is the thermographic technique of interest for this contribution, the component’s surface temperature is rapidly elevated through the application of an intense optical flash. Subsequent recording of the cooling down of the stimulated surface, by means of a high-end infrared camera, allows to detect defects by searching for anomalies in the surface temperature (due to heat build-up above the defect). Considering the anisotropic diffusivity and high damping of thermal waves in CFRP, advanced post-processing techniques are indispensable to detect deep defects (> 2 mm in CFRP). In this paper, FT is performed on several CFRPs with various defects (flat bottom holes, Teflon inserts and barely visible impact damage). This thermographic dataset is then analyzed using various post-processing techniques, including pulsed phase thermography (PPT), principal component thermography (PCT), thermographic signal reconstruction (TSR) and dynamic thermal tomography (DTT), in order to improve the defect detectability and assessment. The performance of the employed processing techniques is critically evaluated.
Keywords
Flash thermography, Non-destructive testing (NDT), Post-processing, Composite

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MLA
Poelman, Gaétan, et al. “Flash Thermography of Composites : Evaluation of Advanced Post-Processing Approaches.” Measuring by Light Meets OPTIMESS 2019, International Meeting on Optical Measurement Techniques and Industrial Applications, Abstracts, 2019, pp. 18–18.
APA
Poelman, G., Hedayatrasa, S., Segers, J., Van Paepegem, W., & Kersemans, M. (2019). Flash thermography of composites : evaluation of advanced post-processing approaches. In Measuring by Light meets OPTIMESS 2019, International Meeting on Optical Measurement Techniques and Industrial Applications, Abstracts (pp. 18–18). Antwerp.
Chicago author-date
Poelman, Gaétan, Saeid Hedayatrasa, Joost Segers, Wim Van Paepegem, and Mathias Kersemans. 2019. “Flash Thermography of Composites : Evaluation of Advanced Post-Processing Approaches.” In Measuring by Light Meets OPTIMESS 2019, International Meeting on Optical Measurement Techniques and Industrial Applications, Abstracts, 18–18.
Chicago author-date (all authors)
Poelman, Gaétan, Saeid Hedayatrasa, Joost Segers, Wim Van Paepegem, and Mathias Kersemans. 2019. “Flash Thermography of Composites : Evaluation of Advanced Post-Processing Approaches.” In Measuring by Light Meets OPTIMESS 2019, International Meeting on Optical Measurement Techniques and Industrial Applications, Abstracts, 18–18.
Vancouver
1.
Poelman G, Hedayatrasa S, Segers J, Van Paepegem W, Kersemans M. Flash thermography of composites : evaluation of advanced post-processing approaches. In: Measuring by Light meets OPTIMESS 2019, International Meeting on Optical Measurement Techniques and Industrial Applications, Abstracts. 2019. p. 18–18.
IEEE
[1]
G. Poelman, S. Hedayatrasa, J. Segers, W. Van Paepegem, and M. Kersemans, “Flash thermography of composites : evaluation of advanced post-processing approaches,” in Measuring by Light meets OPTIMESS 2019, International Meeting on Optical Measurement Techniques and Industrial Applications, Abstracts, Antwerp, 2019, pp. 18–18.
@inproceedings{8619595,
  abstract     = {Carbon fiber reinforced polymers (CFRP) are composite materials that offer a high stiffness-to-weight ratio in comparison to traditional metals, which explains their increasing use in many high-end applications (e.g. aerospace). However, composites are prone to internal damage that may deteriorate the structural integrity, and thus require reliable and non-destructive testing (NDT) approaches. Infrared thermography (IRT) is a promising NDT technique which provides fast, full-field measurements, and in which hidden defects are detectable based on their thermal signatures.
In flash thermography (FT), which is the thermographic technique of interest for this contribution, the component’s surface temperature is rapidly elevated through the application of an intense optical flash. Subsequent recording of the cooling down of the stimulated surface, by means of a high-end infrared camera, allows to detect defects by searching for anomalies in the surface temperature (due to heat build-up above the defect). Considering the anisotropic diffusivity and high damping of thermal waves in CFRP, advanced post-processing techniques are indispensable to detect deep defects (> 2 mm in CFRP).
In this paper, FT is performed on several CFRPs with various defects (flat bottom holes, Teflon inserts and barely visible impact damage). This thermographic dataset is then analyzed using various post-processing techniques, including pulsed phase thermography (PPT), principal component thermography (PCT), thermographic signal reconstruction (TSR) and dynamic thermal tomography (DTT), in order to improve the defect detectability and assessment. The performance of the employed processing techniques is critically evaluated.},
  author       = {Poelman, Gaétan and Hedayatrasa, Saeid and Segers, Joost and Van Paepegem, Wim and Kersemans, Mathias},
  booktitle    = {Measuring by Light meets OPTIMESS 2019, International Meeting on Optical Measurement Techniques and Industrial Applications, Abstracts},
  keywords     = {Flash thermography,Non-destructive testing (NDT),Post-processing,Composite},
  language     = {eng},
  location     = {Antwerp},
  pages        = {18--18},
  title        = {Flash thermography of composites : evaluation of advanced post-processing approaches},
  year         = {2019},
}