Based on terahertz time domain spectroscopy, the parameter extraction model is established, and the refrac-tive index and absorption coefficient of the material are deduced. By building the experimental platform, the refractive index and absorption coefficient of ABS, PET and PMMA in the range of 0.2~1.5THz were compared. The experi-mental show that terahertz spectroscopy can effectively extract three kinds of plastic feature information. It has important significance to detect Plastics utilizing terahertz spectroscopy.%基于太赫兹时域光谱检测技术,建立透射式光学参数提取模型,推导出太赫兹波谱下材料折射率和吸收系数公式.搭建实验平台,得到了室温环境下ABS、PET和PMMA三种塑料样品在0.2~1.5THz区间的折射率和吸收系数,并进行了对比分析.实验结果表明,太赫兹光谱技术可以有效提取三种塑料特征信息.这对利用太赫兹光谱技术检测塑料制品有着重要的意义.
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