利用自行研制的便携式拉曼光谱仪(Hx-Spec)对高山石类寿山石(13组)和老挝石(22组)进行了分类判别分析。Hx-Spec拉曼光谱仪的激发波长785 nm, 光谱范围200～2700 cm-1, 分辨率6 cm-1。结合主成分分析(PCA)和线性判别分析(LDA)建立多元统计算法模型, 将老挝石从高山石类寿山石中区别出的特异性和灵敏度分别为100%与86.7%, 受试样品工作特征(ROC)曲线下面积为0.977。另外, 加入8个新样品作为验证, 判别正确率为87.5%。研究表明, 自行研制的便携式拉曼光谱仪结合PCA-LDA统计分析方法有望用于区分高山石类寿山石和老挝石。

The Raman spectra of 35 stone samples (13 Shoushan stones and 22 Laos stones) are measured by a self-developed portable Raman spectrometer Hx-Spec, which is excited by a 785 nm diode laser and the spectrum range is 200-2700 cm-1 with a resolution of 6 cm-1. A multioariate model is established by combining the principal component analysis (PCA) and the linear discriminant analysis (LDA), a discrimination sensitivity of 86.7% and a specificity of 100% are achieved in separating Laos stone from Shoushan stone, while the performance of corresponding receiver operating characteristic (ROC) curve is 0.977. Besides, a discriminant accuracy achieves 87.5% after 8 new samples are added as a validation. These results demonstrate that the utility of portable Raman spectrometer combined with chemometrics provides a new strategy to discriminate the Shoushan and Laos stones.