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Sensors 2016, 16(6), 875; doi:10.3390/s16060875

Nondestructive Evaluation of Carbon Fiber Reinforced Polymer Composites Using Reflective Terahertz Imaging

1
College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130061, China
2
Research Center for Terahertz Technology, Key Laboratory of Multi-scale Manufacturing Technology, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
3
National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150080, China
*
Authors to whom correspondence should be addressed.
Academic Editors: Vincenzo Spagnolo and Dragan Indjin
Received: 5 May 2016 / Revised: 6 June 2016 / Accepted: 7 June 2016 / Published: 14 June 2016
(This article belongs to the Special Issue Infrared and THz Sensing and Imaging)
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Abstract

Terahertz (THz) time-domain spectroscopy (TDS) imaging is considered a nondestructive evaluation method for composite materials used for examining various defects of carbon fiber reinforced polymer (CFRP) composites and fire-retardant coatings in the reflective imaging modality. We demonstrate that hidden defects simulated by Teflon artificial inserts are imaged clearly in the perpendicular polarization mode. The THz TDS technique is also used to measure the thickness of thin fire-retardant coatings on CFRP composites with a typical accuracy of about 10 micrometers. In addition, coating debonding is successfully imaged based on the time-delay difference of the time-domain waveforms between closely adhered and debonded sample locations. View Full-Text
Keywords: carbon fiber reinforced polymer composites; fire-retardant coatings; nondestructive evaluation; coating debonding; terahertz time-domain spectroscopy imaging carbon fiber reinforced polymer composites; fire-retardant coatings; nondestructive evaluation; coating debonding; terahertz time-domain spectroscopy imaging
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Zhang, J.; Li, W.; Cui, H.-L.; Shi, C.; Han, X.; Ma, Y.; Chen, J.; Chang, T.; Wei, D.; Zhang, Y.; Zhou, Y. Nondestructive Evaluation of Carbon Fiber Reinforced Polymer Composites Using Reflective Terahertz Imaging. Sensors 2016, 16, 875.

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