采用太赫兹时域光谱(THz-TDS)技术测量了奶粉、山梨酸钾及其混合物在0.2～2.0 THz波段的光谱特性, 得到了样品在室温氮气环境下的吸收谱和折射率谱。结果表明山梨酸钾在0.98 THz处存在明显的特征吸收峰。采用简单一元线性回归模型(SLR)对奶粉中山梨酸钾的含量进行了定量分析, 结果表明吸收系数随着混合物中山梨酸钾含量的增大而增大。该研究对于食品质量安全检测具有重要意义。

Terahertz Time-Domain Spectroscopy(THz-TDS) combined with Simple Linear Regression (SLR) is utilized for the detection of potassium sorbate in milk powder. The THz spectra of potassium sorbate in milk powder are measured in time domain; and the absorption and index spectra are obtained in the frequency domain of 0.2-2.0 THz. The results show that potassium sorbate exhibits an obvious characteristic absorption peak at 0.98 THz. The SLR model is applied to identify the content of potassium sorbate in milk powder. The results indicate that the THz spectroscopy combined with SLR is efficient for detection of potassium sorbate content in milk powder.