Abstract:
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(PLS-FT-NIRS) by Cross-Validation after the spectra were analyzed and discussed. According to the selected spectra ranges of 9747.1~7498.3 cm
-1 and 6102~5446.3 cm
-1 and vector normalization processing method, the correlation coefficient
(R2) of the model, the root mean square error of cross validation
(RMSECV) and the rank are 99.99%, 0.165% and four, respectively. Then the model was tested and evaluated and the result showed the
R2 of the test set and the root mean square error of prediction
(RMSEP) are 99.80%, 0.264% respectively. The method has been applied to quick determination of alcohol concentration with satisfactory results in the distilled spirit industry.