蚕茧近红外反射（NIR）光谱的模式识别──Ⅰ．对雌雄鲜茧、死笼茧的非破坏性识别

PATTERN RECOGNITION OF SILKWORM COCOONS BY NEAR INFRARED REFLECTANCE SPECTROSCOPY─Ⅰ. NONDESTRUCTIVE IDENTIFICATION OF SEXUALITY AND VIABILITY OF FRESH COCOON

探讨了利用蚕茧近红外反射光谱识别雌雄茧、死笼茧的方法及可行性。采用６２５０型近红外光谱分析仪，从波长６８０ｎｍ到１２３５ｎｍ对２０５颗鲜茧做了非破坏性扫描测试，用逐步判别方法从一、二阶导数光谱数据中抽取特征向量，以此特征向量建立Ｂａｙｅｓ判别函数，对３７５个检验样本进行识别，其符合率达９５．７％，该方法明显优于以茧的重量和大小判别雌雄的方法。实验结果还表明，雌雄茧近红外反射光谱的差别，主要是由于蚕蛹性质不同所致，而与茧层的关系不大。

The feasibility of the method by applying near infrared reflectance spectroscopy (NIRS) to identify sexuality and viability of fresh cocoon were studied. Nondestructive assay of the sexuality and viability of 205 fresh cocoon by using Model 6250 NIR instrument was conducted with suitable wavelengths chosen between 680nm and 1235nm .The featUre vector was extracted and selected from data of first and second derivative spectra by a stepwise discriminant analysis. When the Bayes' discriminant function built by the feature was ed to predict 375 fort samples, 95.7% of correct rate of the identification recognition was obtained This finding indicates that this method is much better than other identification ones such as cocoon weight and she used for their feature, and shows that the difference between male and female cocoons in their NIR spectra mainly results from thier pupa properties and has less relation to that of their cocoon shell.