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http://dx.doi.org/10.7234/composres.2021.34.3.143

Detection of Fine Delamination in Glass Fiber Reinforced Polymer Analyzing Full Width Half Maximum of Superimposed Terahertz Signal  

Kim, Heon-Su (Department of Mechanical Convergence Engineering, Hanyang University)
Park, Dong-Woon (Department of Mechanical Convergence Engineering, Hanyang University)
Kim, Sang-Il (Department of Mechanical Convergence Engineering, Hanyang University)
Kim, Hak-Sung (Department of Mechanical Convergence Engineering, Hanyang University)
Publication Information
Composites Research / v.34, no.3, 2021 , pp. 143-147 More about this Journal
Abstract
Full width half maximum (FWHM) analysis of superimposed terahertz (THz) signals in the glass fiber reinforced polymer (GFRP) was studied to detect fine delamination inside GFRP. The THz signals were measured for each fine delamination size inside the GFRP using the reflection mode of the terahertz time domain spectroscopy (THz-TDS) system. Then, the FWHM of the superimposed THz signal reflected at the fine delamination was extracted. Thereafter, the complex refractive index of the GFRP was measured using transmission mode of the THzTDS system. Based on this, the FWHM of the superimposed THz signal at the fine delamination were calculated and compared with respect to the fine delamination size. From the theoretically calculated superimposed signals, the relationship between the fine delamination size and the FWHM in the superimposed THz signal was derived. Consequently, the fine delamination size could be predicted through the analysis of the FWHM extracted from the THz signal at the fine delamination.
Keywords
Non-destructive evaluation; Terahertz; Composite materials; Fine delamination;
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