Zhang Jin, Li Wei, Cui Hong-Liang, Shi Changcheng, Han Xiaohui, Ma Yuting, Chen Jiandong, Chang Tianying, Wei Dongshan, Zhang Yumin, Zhou Yufeng
College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130061, China.
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.
Sensors (Basel). 2016 Jun 14;16(6):875. doi: 10.3390/s16060875.
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.
太赫兹（THz）时域光谱（TDS）成像被认为是一种用于复合材料的无损评估方法，用于在反射成像模式下检查碳纤维增强聚合物（CFRP）复合材料和防火涂层的各种缺陷。我们证明，由聚四氟乙烯人工插入物模拟的隐藏缺陷在垂直偏振模式下能清晰成像。太赫兹TDS技术还用于测量CFRP复合材料上薄防火涂层的厚度，典型精度约为10微米。此外，基于紧密粘附和脱粘样品位置之间时域波形的时间延迟差异，成功地对涂层脱粘进行了成像。
