【摘要】 以拉曼光谱技术为实验方法,对钠铝辉石、绿辉石、钠铬辉石三类天然翡翠及透辉石进行测定;运用迭代限制最小二乘多项式拟合算法对基线进行校正;进一步探究分析其光谱特征,包括特征峰位、峰强、半峰宽及振动原因。借助主成分分析法实现了3类翡翠及透辉石的模式识别。PCA投影结果表明,钠铬辉石质翡翠由于样本光谱的相对差异性较大,聚类离散程度较大,其他3类玉石的聚集效果较好。更多还原

【Abstract】 Raman spectroscopy was used to determine three types of natural jadeites( percivalite,omphacite, kosmochlor) and diopside. The method of iterative restricted least squares polynomial fitting was carried out on the baseline correction of Raman spectrum. Spectral characteristics,including peak position,peak strength,half peak width and vibration were further explored and analyzed. With the aid of principal component analysis method,pattern recognition for the three types of jadeites and diopside was realized successfully. The result of PCA projection showed that the clustering discrete degree of kosmochlor samples was large due to the relative difference of their spectra while the other three kinds of jades gathered quite well.更多还原