Enhanced Terahertz Imaging of Small Forced Delamination in Woven Glass Fibre-reinforced Composites with Wavelet De-noising
Enhanced Terahertz Imaging of Small Forced Delamination in Woven Glass Fibre-reinforced Composites with Wavelet De-noising
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DOI：
10.1007/s10762-015-0226-9
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发表时间：
2016-03-01
影响因子：
2.9
通讯作者：
Citrin, D. S.
中科院分区：
文献类型：
--
作者：
Dong, Junliang;Locquet, Alexandre;Citrin, D. S.
应用太赫兹(THz)反射成像技术研究了一种机织玻璃纤维增强复合材料层合板的受迫分层特性。强制分层是通过插入低于太赫兹轴向分辨率的25微米厚的UPILEX薄膜的盘来产生的，从而在反射的太赫兹脉冲中产生一个具有小幅度的特征回波。由于环境水蒸气引起的时间信号的低幅度分量产生与从分层界面反射的与THz脉冲相关的特征具有相当幅度的特征，并抑制THzC和B扫描的对比度。小波收缩去噪去除水汽特征，导致增强的太赫兹C和B扫描，以高对比度在三维定位分层。
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- mu 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.