Acta Optica Sinica, Volume. 41, Issue 17, 1712003(2021)
Terahertz Nondestructive Test of Delamination Defects in Glass-Fiber-Reinforced Composite Materials
Finite-difference time-domain and terahertz time-domain spectroscopy are used to study the internal delamination defects in glass-fiber-reinforced composite materials. First, the optical parameters of the glass-fiber-reinforced composite material in the terahertz frequency band are obtained using transmission terahertz time-domain spectroscopy; the finite-difference time-domain method is used to simulate the defects. Second, a terahertz time-domain spectroscopy system is used to inspect the prefabricated sample. Finally, the defects are imaged and analyzed for comparison to the time-domain waveform data determined theoretically and through actual detection. It is found that both methods can detect delamination defects with a thickness of 0.3 mm at a distance of 3 and 5 mm from the upper surface of the materials. These results show that the finite-difference time-domain method can provide theoretical support for detecting defects in composite materials by using terahertz time-domain spectroscopy while reducing the dependence on standard components; the terahertz time-domain spectroscopy system can effectively detect internal defects of materials and assess their overall performance through the detection results.
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Qishu Wang, Da Mu, Tongyu Zhou, Jiaojiao Ren, Dandan Zhang, Yinjie Xin. Terahertz Nondestructive Test of Delamination Defects in Glass-Fiber-Reinforced Composite Materials[J]. Acta Optica Sinica, 2021, 41(17): 1712003
Category: Instrumentation, Measurement and Metrology
Received: Jan. 15, 2021
Accepted: Mar. 31, 2021
Published Online: Sep. 3, 2021
The Author Email: Mu Da (md_79@126.com)