中草药分析与鉴定对中草药质量控制意义重大, 以飞秒激光为基础的太赫兹时域光谱技术(THz-TDS)是一种新型相干远红外光谱测量技术。 为了研究基于太赫兹谱的中药材鉴别可行性, 应用THz-TDS研究了室温下黄芪、 当归、 杜仲及三种掺杂的黄芪在0.2~2.2 THz范围内的光学特性, 得到了对应的时域谱、 频域谱和吸收谱。 结果表明在此波段三种中草药的时域谱、 频域谱及吸收谱存在显著差异; 三种掺杂黄芪的频域谱、 吸收谱虽相似但也有明显不同。 利用太赫兹时域光谱技术鉴别中药材是可行的, 它可为中草药质量控制提供一种新的方法。

In order to study the feasibility of the identification of Chinese herbal medicines based on terahertz spectroscopy, the optical characteristic of astragalus, angelica, eucommia and three kinds of astragalus samples with different impurities in the frequency range 0.2~2.2 THz were researched by terahertz time-domain spectroscopy (THz-TDS), and their time-domain spectra, the frequency spectra and the absorption spectra were obtained at room temperature. The results indicated that the time-domain spectra, frequency-domain spectra and absorption spectra of astragalus, angelica, and eucommia have large differences in such a frequency range, the frequency-domain spectra and absorption spectra of three kinds of astragalus samples with different impurities are similar but there exists distinct difference. These researches proved that it is feasible to use terahertz time-domain spectroscopy to identify Chinese herbal medicine and provided a new method for Chinese herbal medicine quality control.