Enhancing the Visibility of Delamination during Pulsed Thermography of Carbon Fiber-Reinforced Plates Using a Stacked Autoencoder

Sensors
Changhang XuGangbing Song

Abstract

The effectiveness of pulsed thermography (PT) for detecting delamination in carbon fiber-reinforced polymer (CFRP) plates has been widely verified. However, delaminations are usually characterized by weak visibility due to the influences of inspection factors and the delaminations with weak visibility are easily missed in real inspections. In this study, by introducing a deep learning algorithm-stacked autoencoder (SAE)-to PT, we propose a novel approach (SAE-PT) to enhance the visibility of delaminations. Based on the ability of SAE to learn unsupervised features from data, the thermal features of delaminations are extracted from the raw thermograms. The extracted features are then employed to construct SAE images, in which the visibility of delaminations is expected to be enhanced. To test the performance of SAE-PT, we inspected CFRP plates with prefabricated delaminations. By implementing SAE-PT on the raw inspection data, the delaminations were more clearly indicated in the constructed SAE images. We also compare SAE-PT to the widely used principal component thermography (PCT) method to further verify the validity of the proposed approach. The results reveal that compared to PCT, SAE-PT can show delaminations in CFRP with h...Continue Reading

References

Mar 12, 2003·Neuron·John H Reynolds, Robert Desimone
Jul 29, 2006·Science·G E Hinton, R R Salakhutdinov
Dec 28, 2011·IEEE Transactions on Pattern Analysis and Machine Intelligence·Stas GofermanAyellet Tal
Jun 22, 2013·IEEE Transactions on Pattern Analysis and Machine Intelligence·Clément FarabetYann Lecun
Jun 22, 2013·IEEE Transactions on Pattern Analysis and Machine Intelligence·Hoo-Chang ShinMartin O Leach
Sep 10, 2015·IEEE Transactions on Pattern Analysis and Machine Intelligence·Ming-Ming ChengShi-Min Hu
Dec 14, 2017·Sensors·Muhammad SohaibJong-Myon Kim

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Methods Mentioned

BETA
delamination
delaminations

Software Mentioned

PCT
SAE
PT

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