食品和药品的检测在民生领域中具有重要的应用价值,为此提出一种基于太赫兹时域谱分析的检测方法。使用太赫兹时域光谱探测技术研究不同包裹物覆盖下物质的太赫兹谱特性,并对高相对湿度条件下的太赫兹样品探测技术进行研究。采用一种简单有效的谱减法处理样品光谱中的水汽吸收干扰,并计算样品在太赫兹波段的折射率和吸收系数。通过计算不同包裹物屏蔽下样品的折射率和吸收系数,所提方法可以准确分辨样品种类。

The detection of food and medicine has important application value in the field of education and civic. Therefore, a detection method based on terahertz time-domain spectrum analysis is proposed. The terahertz time-domain spectroscopy detection technology is used to study the terahertz spectrum characteristics of materials covered by different packages, and the detection technology of terahertz samples under high relative humidity conditions is studied. A simple and effective spectral subtraction method is used to deal with the water vapor absorption interference in the sample spectrum, and to calculate the refractive index and absorption coefficient of the sample in the terahertz band. By calculating the refractive index and absorption coefficient of the samples shielded by different wrappers, the proposed method can accurately distinguish the types of samples.