Jie Wang 1, Jin Zhang 1*, Tianying Chang 1, 2, and Hong-Liang Cui 1, 3
1 College of Instrumentation and Electrical Engineering, Jilin University, Changchun, Jilin, China 130061
2 Institute of Automation, Qilu University of Technology (Shandong Academy of Sciences), Jinan, Shandong, China 250014
3 Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, China 400714
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Abstract: A glass fiber reinforced polymer (GFRP) solid panel hidden different material inclusions has been systematically detected via terahertz (THz) time domain spectroscopy (TDS) system. It is experimentally demonstrated that the defect detection effect of THz-TDS imaging technology is obviously different for several material inclusions. Under the transmission mode, the imaging effect of the inclusion is proportional to the attenuation degree difference of THz wave after penetrating the inclusion defect, whereas it depends on the refractive index difference between the inclusion and the epoxy GFRP solid panel under the reflection mode. Furthermore, X-ray computed tomography (CT) and ultrasonic imaging are also used to detect the GFRP solid panel. The detection results among THz-TDS, X-ray CT, and ultrasonic imaging with regard to fiber orientation, visualization of defect and inspection cost are comparatively analyzed to evaluate the correct location of THz-TDS technology in the traditional nondestructive evaluation (NDE) tools.
Keywords: Glass fiber reinforced polymer composites; Terahertz; X-ray; Ultrasound; Nondestructive evaluation.
Acknowledgments: This work was supported by the Ministry of Science and Technology of China (2015CB755401), National Natural Science Foundation of China (61705120), Department of Science & Technology of the Shandong Province (2017GGX10124, 2017GGX10108), Youth Science Funds of Shandong Academy of Sciences (2017QN0015), and Innovation Program of Shandong Academy of Sciences.
Cite this article:
Jie Wang, Jin Zhang, Tianying Chang, and Hong-Liang Cui(Invited Paper)Nondestructive evaluation of different material inclusions in glass fiber reinforced polymer composites by terahertz imagingJ]. International Journal of Terahertz Science and Technology, 2018, Vol.11, No.3: 91-101. DOI:10.11906/TST.091-101.2018.09.09