Abstract
The interest toward lightweight composites in the aeronautical industry grows year by year. The challenge is the identification and characterization of defects by using an integration of different techniques. The use of the infrared thermography (IRT) method for the inspection of lightweight composites is poorly documented in the open literature, due to the low heat diffusion through the honeycomb cores. In this study, IRT was used to retrieve the unknown positions of internal inserted objects in three different lightweight composite structures, by using three new thermal image processing integration methods. The corresponding post-processed results were compared against the traditional principal component thermography and pulsed phase thermography image processing techniques. The comparison showed that the integrated signal smoothing processing enhanced the image quality compared to the established techniques. Then, a thermal-physical analysis corresponding to the experimental results was conducted, in order to explain the experimental results. Finally, the advantages and disadvantages of the different presented methods when applied on the different lightweight composite structures were summarized.
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Acknowledgements
The authors would like to thank Michael Brothers from the National Research Council (NRC) Canada for his assistance. The authors are also indebted to Eng. E. Valentini (Mecaer Aviation Group—Monteprandone—Italy) for the fabrication of the samples used in this work.
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This research is supported by the Canada Research Chair in Multipolar Infrared Vision (MiViM) and the Natural Sciences and Engineering Research Council Canada (NSERC) through a Discovery Grant.
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Zhang, H., Sfarra, S., Genest, M. et al. A Comparative Study of Enhanced Infrared Image Processing for Foreign Object Detection in Lightweight Composite Honeycomb Structures. Int J Thermophys 39, 140 (2018). https://doi.org/10.1007/s10765-018-2460-6
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DOI: https://doi.org/10.1007/s10765-018-2460-6