The biodiesel content in petroleum diesel-biodiesel blends is determined using broadband terahertz time-domain spectroscopy. We model the spectra of the blend components based on the nonpolar characteristics of the samples. The biodiesel content in diesel is determined from the coefficients that best fit the measured spectra to the optimal linear combination of the model for each individual component (pure diesel and pure biodiesel). This method proves to be valid for real-time applications. A simpler approach based on the maximum observed dispersion is also demonstrated to be a distinctive characteristic of a given blend.

中文翻译：

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太赫兹时域光谱法宽带测定石油柴油混合物中生物柴油的含量

使用宽带太赫兹时域光谱法测定石油柴油-生物柴油混合物中的生物柴油含量。我们基于样品的非极性特征对共混物成分的光谱进行建模。柴油中的生物柴油含量是根据最适合测量光谱的系数确定的，该系数适合模型中每种单独组分（纯柴油和纯生物柴油）的最佳线性组合。事实证明该方法对实时应用是有效的。还证明了基于最大观察到的分散度的更简单方法是给定共混物的鲜明特征。