常见服装面料的太赫兹光谱研究

利用自建的太赫兹时域光谱系统对生活中主要的常见服装面料进行了实验研究，实验中首先对棉、毛、麻、丝、涤纶、氨纶、混纺等这7 种典型面料分别进行测试，可以获得各自的太赫兹时域光谱，然后利用快速傅里叶变换关系分别对每个时域脉冲进行相关计算，最终获得这些面料的太赫兹频域光谱信息，尤其是样品的折射率和吸收系数等。研究表明，这些在可见光波段不透明的服装面料，在太赫兹频段几乎完全可透视，且没有特征吸收峰，该研究对于进一步开展隐藏危险物的识别和成像具有非常重要的意义。

Investigation of various fabrics in terahertz time-domain spectroscopy

The spectral properties of various fabrics were investigated by using terahertz time-domain spectroscopy. Through measuring the time-domain spectra in experiments and calculating frequency-domain spectra by applying the fast Fourier-transform (FFT) to each pulse waveform, the spectral information of fabrics in terahertz region, especially the transmission and absorbance, was obtained and analyzed. It is well demonstrated that the fabrics, which are opaque in visible light, are almost transparent in terahertz region and no special absorption spectra. This research has a great influence on identifying the concealed danger and terahertz imaging.