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A Comparative Study of Non-destructive Evaluation of Glass Fiber Reinforced Polymer Composites Using Terahertz, X-ray, and Ultrasound Imaging

Authors
  • Wang, Jie1
  • Zhang, Jin1
  • Chang, Tianying1, 2
  • Cui, Hong-Liang1, 3
  • 1 Jilin University, College of Instrumentation and Electrical Engineering, Changchun, Jilin, 130061, China , Changchun (China)
  • 2 Qilu University of Technology (Shandong Academy of Sciences), Institute of Automation, Jinan, Shandong, 250014, China , Jinan (China)
  • 3 Chinese Academy of Sciences, Chongqing Institute of Green and Intelligent Technology, Chongqing, 400714, China , Chongqing (China)
Type
Published Article
Journal
International Journal of Precision Engineering and Manufacturing
Publisher
Korean Society for Precision Engineering
Publication Date
Apr 16, 2019
Volume
20
Issue
6
Pages
963–972
Identifiers
DOI: 10.1007/s12541-019-00114-z
Source
Springer Nature
Keywords
License
Yellow

Abstract

A set of samples of glass fiber reinforced polymer composites with Teflon inclusions in the shape of pentagram have been specifically designed and fabricated for the purpose of assessing the efficacy and practicality of terahertz (THz) time domain spectroscopy (TDS) system in non-destructive evaluation (NDE), in side-by-side comparison with X-ray computed tomography (CT), and ultrasonic imaging. The samples feature systematic variation of Teflon inclusions of a variety of thicknesses and placement depths. An improved THz imaging algorithm is proposed and demonstrated to enhance the capability of THz-TDS detection by adding an appropriate window for sampling the reflected time-domain waveform a posteriori. Additionally, image fusion algorithm based on block segmentation is applied to combine multiple imaging detection results, leading to further improvement of the final defect detection capability. Comparative analysis of the detection results among THz-TDS, X-ray CT, and ultrasonic imaging is carefully carried out to assess the merits and disadvantages of each technique, and to attempt to find a proper place for THz-TDS imaging in the traditional arsenal of NDE tools.

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