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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。
Terahertz Time-Domain Spectroscopy (THz-TDS) is a nondestructive detection technique that extracts media information from broadband terahertz pulses to extract internal information from the sample. At present, most of this technology is used in the field of qualitative analysis such as safety monitoring and imaging. The widely used ceramic matrix composites as a test sample, through the establishment of single-point thickness detection model and the extraction of optical parameters, the technology used for density distribution detection and hole defect size detection, quantitative measurement. Design and verification experiments were conducted, the standard materials and defects were exploratory measurement and evaluation. The experimental results obtained the ideal time-frequency spectral analysis results and imaging results, revealing that THz-TDS can reveal quantitatively nondestructive testing of materials and exploration of material characteristics.