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利用太赫兹时域光谱成像技术检测了内含缺陷的玻璃纤维与碳纤维增强复合材料,获得了材料内部缺陷的太赫兹透射图像,从而实现对复合材料样本的无损检测。实验结果表明,太赫兹透射成像技术可检测出多层玻璃纤维复合材料的层间缺陷。但该技术对于碳纤维复合材料中缺陷的检测能力有限,主要是因为碳纤维具有导电特性,导致太赫兹信号对其穿透能力有限。通过对成像模式的调节,太赫兹无损检测技术可对碳纤维材料内部深度约为0.2 mm、宽度为10 mm的缺陷进行成像检测。这为发展准确、灵敏、高效的纤维增强复合材料太赫兹无损检测技术提供了基础实验数据。
Terahertz time-domain spectroscopy was used to detect the glass fiber and carbon fiber reinforced composites with defects, and the terahertz transmission images with internal defects of the materials were obtained, so as to realize the nondestructive testing of the composite samples. The experimental results show that the terahertz transmission imaging technique can detect the interlayer defects of the multilayer glass fiber composites. However, this technique has limited ability to detect defects in carbon fiber composites, mainly because of the conductive nature of carbon fibers, which results in the limited ability of terahertz signals to penetrate them. Through the adjustment of the imaging mode, THz non-destructive testing technology can detect defects of about 0.2 mm depth and 10 mm width inside the carbon fiber material. This provides the basic experimental data for the development of accurate, sensitive and efficient terahertz non-destructive testing technology of fiber-reinforced composites.