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太赫兹(THz)辐射能够穿透很多对可见光不透明的非金属、非极性材料,而用X辐射对这些材料成像的对比度又相对低,因此,太赫兹成像在安全检测和生产质量控制等领域日益受到重视。对成像材料的太赫兹特性的实际测量是太赫兹成像技术的重要组成部分。利用CO_2激光抽运太赫兹激光对聚四氟乙烯材料的太赫兹吸收特性和透过光斑轮廓进行了实验研究,获得聚四氟乙烯在70.51μm,96.5μm,118.83μm,122.4μm,158.51μm,184.31μm和214.58μm波长的吸收系数。
THz radiation penetrates many non-metallic, non-polar materials that are opaque to visible light, and the relatively low contrast of these materials with X-radiation therefore terahertz imaging in areas such as safety testing and manufacturing quality control Increasing attention. The actual measurement of terahertz properties of imaging materials is an important part of terahertz imaging technology. The characteristics of terahertz absorption and terahertz tracing of polytetrafluoroethylene (PTFE) material were studied by using CO_2 laser pumping terahertz laser. The effects of polytetrafluoroethylene on the surface of 70.51μm, 96.5μm, 118.83μm, 122.4μm, 158.51μm, Absorption coefficient for 184.31 μm and 214.58 μm wavelengths.