| Near Infrared Spectroscopy analysis technology is a qualitative and quantitative analysis technology developed in recent years. It is fast, does not destroy the sample, runs simply, and now it has been widely used in various fields. In this paper, we use the characteristics of the Near Infrared Spectroscopy analysis technology, first analyze 54 puer tea’s Near Infrared Spectrum charts of different years to identify the pu-er tea year. The research shows that increased with years of pu-er tea, the main chemical constitute reduces unceasingly, and the near-infrared light absorption value decreases, so the degree of sharp peak reduces. Then Clustering analysis technology is applied for qualitative analysis of pu-er teas of different years. From the Clustering analysis, it can be seen in the 3d stereogram that each year of pu-er tea has obvious clustering phenomena, specially, three samples of pu-er tea are judged wrong, so the recognition accuracy is 94.444%. |
