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Terahertz Spectroscopy and Imaging Detection of Defects in Civil Aircraft Composites
Journal of Spectroscopy ( IF 2 ) Pub Date : 2020-02-20 , DOI: 10.1155/2020/2312936
Mian Zhong 1 , Bingwei Liu 1 , Chen Li 2 , Zhiqi Wang 2 , Dongshan Wei 3 , Bin Zhou 4 , Xin Dai 1 , Yajun Xu 1
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Composite materials have increasingly become a high proportion of the structural weight of aircraft due to their excellent performances. Different types of damages may occur in the aircraft service period, which will bring potential safety risks to aircrafts. To investigate the defect damage detection and its spectral characteristics and imaging of carbon-fiber-reinforced polymer composite laminates, defects from the low-velocity impact damage in composites were measured by the THz time-domain reflection imaging system. Results show that there exists obvious THz spectral differences between the impact damaged defects and nondefect. The effective detection frequency band for the low-speed impact damaged defect is 0.12–2.0 THz. In the time domain, there are attenuations and delays in the spectra of defects relative to those of nondefects. In the frequency domain, with the increase of frequency, the power spectral density of the defect first increases and then decreases, and the absorption coefficient increases slowly. In general, the imaging results in time-domain imaging are better than those from the frequency-domain imaging, which not only is suitable for the qualitative detection of defects but also has great potential and application prospects in quantitative detection. This work shows an important guide for the application of THz technology to detect the composite material defects in civil aircraft.

中文翻译:

太赫兹光谱学和民用飞机复合材料缺陷的成像检测

由于其优异的性能,复合材料已越来越占飞机结构重量的很大一部分。飞机使用期内可能会发生不同类型的损坏,这将给飞机带来潜在的安全隐患。为了研究碳纤维增强聚合物复合材料层压板的缺陷损伤检测及其光谱特性和成像,通过THz时域反射成像系统测量了复合材料中低速冲击损伤的缺陷。结果表明,冲击损伤缺陷与非缺陷之间存在明显的太赫兹光谱差异。低速冲击损坏缺陷的有效检测频段为0.12–2.0 THz。在时域中,相对于无缺陷的频谱,缺陷频谱存在衰减和延迟。在频域中,随着频率的增加,缺陷的功率谱密度先增大然后减小,吸收系数缓慢增大。总体而言,时域成像的成像效果优于频域成像,不仅适用于缺陷的定性检测,而且在定量检测方面具有很大的潜力和应用前景。这项工作为应用太赫兹技术检测民用飞机的复合材料缺陷提供了重要指导。时域成像的成像效果优于频域成像,不仅适用于缺陷的定性检测,而且在定量检测方面具有很大的潜力和应用前景。这项工作为应用太赫兹技术检测民用飞机的复合材料缺陷提供了重要指导。时域成像的成像效果优于频域成像,不仅适用于缺陷的定性检测,而且在定量检测方面具有很大的潜力和应用前景。这项工作为应用太赫兹技术检测民用飞机的复合材料缺陷提供了重要指导。
更新日期:2020-02-20
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