烟草近红外光谱模型的适配性研究

Study on Suitability of Near-infrared Spectroscopy Model for Tobacco

摘要: 为了研究近红外模型适配性的优劣,运用主成分分析法和马氏距离法对模型的适配性进行了考察,将超出和接近马氏距离阈值的部分样品补充进模型,对模型进行修正。修正后的模型对于待测样品化学成分:氯、钾、总植物碱、石油醚提取物、还原糖和总氮的化学预测值的相对平均偏差分别为7.44%、5.33%、3.28%、6.94%、3.26%和4.65%。说明修正后的模型能够预测更为广泛的未知样品,且预测结果更加准确。

Abstract: The suitability of near-infrared spectroscopy model was investigated with principal component analysis and Mahalanobis distance,and the model was modified by complementing with the samples beyond and nearby the threshold of Mahalanobis distance.Some chemical components were predicted by modified model and the average relative deviations of chlorine,potassium,total alkaloids,total petroleum ether extract,reducing sugar and total nitrogen were 7.44%,5.33%,3.28%,6.94%,3.26% and 4.65%,respectively.