变性燃料乙醇的快速近红外光谱(DA7200)分析

本文论述了采用近红外光谱DA7200的液体分析装置检测变性燃料乙醇主要成分含量的方法。讨论采用偏最小二乘法(PLS)建立校正模型过程中样品预处理及利用常规吸收峰优选波长的方法。经验证：水分、乙醇、甲醇、变性剂的预测值与浓度参考值具有良好相关性(相关系数大于0．96)，测量重复性变异系数(CV)优于2％。结果表明，近红外光谱DA7200的液体分析装置可以满足变性燃料乙醇主要成分含量的实际测量要求，并可作为在线分析的参考模式。

Rapid analyze of denatured fuel ethanol by near-infrared spectroscopy(DA7200)

The method of assay of principal constituents of denatured fuel ethanol by the set of liquid analyze with near-infrared spectroscopy(DA7200) has been expounded in this thesis. The authors has described the pre-treatment way of sample during the period of setting regression models by partial least-squares(PLS) and the way of wavelength optimum selection according to normal absorbing peak .It's test and verified that the measuring value of moisture, ethanol ,methanol, denaturant has a good correlation between prediction values with reference values (correlation coefficient is higher than 0.96), In addition, the results were reliable with coefficient of variation (CV) of repeatability below 2 percent. Therefore, the set of liquid analyze with near-infrared spectroscopy of reflectance could meet practical measurement accuracy as required for principal constituents of denatured fuel ethanol, and regard as a new a new reference mode for on_line analyze too.