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

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• 作者：Junliang Dong ; Alexandre Locquet…
• 关键词：THz imaging ; Wavelet de ; noising ; Forced delamination ; Woven glass fibre ; reinforced composite ; Water vapor effects
• 刊名：International Journal of Infrared and Millimeter Waves
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：37
• 期：3
• 页码：289-301
• 全文大小：1,616 KB
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• 作者单位：Junliang Dong (1) (2)
  Alexandre Locquet (1) (2)
  D. S. Citrin (1) (2)
  
  1. Georiga Tech-CNRS, UMI2958, Georgia Tech Lorraine, Metz, 57070, France
  2. School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA
  
• 刊物类别：Physics and Astronomy
• 刊物主题：None Assigned
• 出版者：Springer New York
• ISSN：1866-6906

文摘

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. Keywords THz imaging Wavelet de-noising Forced delamination Woven glass fibre-reinforced composite Water vapor effects