近红外光谱法快速测定白酒中的酒精度

为了得到白酒工业中酒精度的快速检测技术，将偏最小二乘法与傅立叶变换近红外光谱法相结合，建立白酒酒精度的快速定量模型。通过标准归一化预处理光谱，光谱范围选择5731.40~5897.25、5901.11~6063.10、8327.12~8423.54 cm-1，主成分数为5，得到模型的内部交互验证相关系数(R)为0.9992，交互验证均方差(RMSECV)为0.263；模型的预测值与实测值的相关系数为0.99，预测标准偏差(RMSEP)为0.435。结果表明，模型的预测效果很好，具有较高的精密度和良好的稳定性，能满足生产中白酒酒精度的快速检测要求。

Rapid determination of alcohol content in distilled spirit by NIR spectroscopy

In order to measuring alcohol concentration in distilled spirit accurately and quickly, a calibration model was established based on Fourier Transform Near Infrared Spectroscopy with partial least square. According to the selected spectra ranges of 5731.40-5897.25, 5901.11-6063.10, 8327.12-8423.54 cm -1 and standard normal variate processing method, the rank was five. The correlation coefficient（R） of the model and the root mean square error of cross validation （RMSECV） are 0.99916, 0.263 respectively, Then the model was tested and evaluated and the result showed the R of the test set and the root mean square error of prediction （RMSEP） are 0.99,0.453 respectively. The method has been applied to quick determination of alcohol concentration with satisfactory results in the distilled spirit industry.