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Enhanced Terahertz Imaging of Small Forced Delamination in Woven Glass Fibre-reinforced Composites with Wavelet De-noising

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Abstract

Terahertz (THz) reflection imaging is applied to characterize a woven glass fibre-reinforced composite laminate with a small region of forced delamination. The forced delamination is created by inserting a disk of 25- μ m-thick Upilex film, which is below the THz axial resolution, resulting in one featured echo with small amplitude in the reflected THz pulses. Low-amplitude components of the temporal signal due to ambient water vapor produce features of comparable amplitude with features associated with the THz pulse reflected off the interfaces of the delamination and suppress the contrast of THz C- and B-scans. Wavelet shrinkage de-noising is performed to remove water-vapor features, leading to enhanced THz C- and B-scans to locate the delamination in three dimensions with high contrast.

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Acknowledgements

The authors acknowledge R. Bergman of Ten Cate Advanced Composites BV for kindly supplying the samples in this study and for helpful discussions. The authors also acknowledge the financial support of the Conseil Régional de Lorraine, and the Fonds Européen de Développement Régional (FEDER)

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Authors and Affiliations

  1. Georiga Tech-CNRS, UMI2958, Georgia Tech Lorraine, Metz, 57070, France

    Junliang Dong, Alexandre Locquet & D. S. Citrin

  2. School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA

    Junliang Dong, Alexandre Locquet & D. S. Citrin

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  1. Junliang Dong
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  2. Alexandre Locquet
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  3. D. S. Citrin
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Correspondence to Junliang Dong.

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Dong, J., Locquet, A. & Citrin, D.S. Enhanced Terahertz Imaging of Small Forced Delamination in Woven Glass Fibre-reinforced Composites with Wavelet De-noising. J Infrared Milli Terahz Waves 37, 289–301 (2016). https://doi.org/10.1007/s10762-015-0226-9

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  • DOI: https://doi.org/10.1007/s10762-015-0226-9

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