太赫兹技术在陶瓷基复合材料缺陷无损检测中的应用（英文）

Application of terahertz technology in nondestructive testing of ceramic matrix composite defects

太赫兹时域光谱技术(THz-TDS)是一种通过宽频带太赫兹脉冲携带介质信息,从而完成对样品内部信息提取的无损检测技术。目前,这种技术大多应用于安全监测,外形成像等定性分析领域。将该应用广泛的陶瓷基复合材料做为检测样品,通过建立单点厚度检测模型和光学参数的提取,将该技术用于密度分布检测和孔洞缺陷尺寸检测,进行定量测量。设计并进行了验证实验,对标准材料及缺陷进行了探索性的测量及评价。实验获取了较为理想的时频光谱分析结果及成像结果,显示出了THz-TDS在材料的定量无损检测和探究材料特征方面具有揭示作用。

Ceramic Matrix Composite （CMC） has been widely applied for its excellent protection performance. It was hard for raditional testing means as ultrasonic to complete internal spection due to the porous structure of CMC. Terahertz Time-Domain Spectroscopy （THz-TDS） was applied to establish the THz Nondestructive Testing（NDT） model of thickness at single point and to extract optical parameters of material samples. In further verifying experiments, exploratory detection and evaluation were developed on porosity distribution and defect sizes. Scanning imaging performance and conclusion of time-frequency spectrum analysis are relatively plausible on CMC internal testing through the experiments. The study in this paper proves the revealing ability of THz-TDS on quantitative NDT and properties exploring of specific materials.