几种化学纤维的太赫兹时域光谱研究

Terahertz time-domain spectroscopic of several chemical fibers

为了解化学纤维在太赫兹波段的光学特性,尝试通过太赫兹时域光谱测试技术和自由空间电光采样方法获得几种化学纤维（涤纶、芳纶、维纶）的透射光谱,进而计算他们在0.2~1.0 THz频段的吸收系数和折射率。实验结果表明：纤维在太赫兹频段存在特征频谱响应,可以用来探测分子的结构信息和振动情况。所得结果表明,不同化学纤维在远红外区域的光谱存在差异,太赫兹光谱可以作为红外光谱的互补技术鉴别不同的化学纤维。

In order to understand the spectroscopic characteristics of chemical fibers in the terahertz region, the research trys to obtain the transmission spectra of three kinds of chemical fiber （Polyester, Kevlar 1414, Vinylon） by Tetahertz time-domain spectroscopy techniques and free-space electro-optic sampling method. And then the absorption coefficient and refractive index of the three fibers in the 0.2 ~ 1.0 terahertz region have been calculated. The experimental results indicate that the three fibers have the special response in terahertz spectral range, which could be used to detect the molecular structure and vibration of the sample. The results confirmed that the spectrocscopy of different chemical fibers varies in the far-infrared region, terahertz spectrum can be used as complementary technology of the infrared spectrum to identify various chemical fibers.