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漫反射光谱结合化学计量学方法无损分析彩绘文物颜料
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作者单位
杨璐,黄建华,陈欣楠,吕竑树,王丽琴,苏伯民 1.西北大学文化遗产学院文化遗产研究与保护技术教育部重点实验室2.陶质彩绘文物保护国家文物局重点科研基地秦始皇兵马俑博物馆3.敦煌研究院保护研究所 
基金项目:国家重点研发计划项目(2019YFC1520700);陕西省重点研发计划项目(2019ZDLSF07-05)
中文摘要:为了对彩绘文物颜料进行无损判别分析,该文采集了12种彩绘常用颜料参考样品的漫反射光谱,根据光谱曲线外形将参考样品分为红黄色系及蓝绿色系两类。使用主成分分析(PCA)分别对两个色系参考样品的光谱数据集进行降维,抽提出最有代表性的3个主成分,利用成分得分散点图确认了颜料间的类间差异,并通过成分矩阵探讨了对该差异贡献率最高的光谱波长区间。在此基础上,采用线性判别分析(LDA)对PCA的分析结果进行建模,拟合判别函数并将其应用于2件颐和园仁寿殿上架彩画文物样品颜料的分析。基于样品判别得分散点图与各类别参考样品间的距离,判定文物使用的颜料分别为铁红和群青。研究表明,该文构建的判别函数能够准确区分颜料的种类,可用于彩绘文物样品的无损分析鉴别。文物样品的污染或老化可能会影响分析,需事先进行表面清理。
中文关键词:漫反射光谱  彩绘文物颜料  主成分分析(PCA)  线性判别分析(LDA);无损分析
 
Nondestructive Analysis of Culture Relics Pigments by Chemometrics Combined with Diffuse Reflectance Spectroscopy
Abstract:To realize the nondestructive discriminant analysis of the pigments used in polychrome relics,the diffuse reflectance spectra for 12 kinds of pigments reference samples were collected.According to the shapes of the spectra,the reference samples were divided into two categories:red yellow and blue green.Principal component analysis(PCA) was used to reduce the dimensions of the spectra data sets of the two kinds of reference samples,and three principal components were extracted.The difference between the pigments was confirmed by using the scatter plot of PCA,and the spectral wavelength range with the highest contribution to the difference was discussed with the components matrix.Based on the PCA analysis results,the linear discriminant analysis(LDA) was used to fit the discriminant function which was applied in the analysis of two paintings samples from Renshou Hall of the Summer Palace.According to the distance between the scatter diagram of sample score discrimination and the reference samples of each category,the pigments used for cultural relics were determined to be hematite and ultramarine,respectively.Results showed that the discriminant function could be used to distinguish the kinds of pigments accurately,and analyze and identify the cultural relics pigments nondestructively.Nevertheless,the pollution or aging of cultural relics samples may affect the analysis,the surface cleaning is thus required in advance.
Key Words:diffuse reflectance spectroscopy  culture relics pigments  principal component analysis(PCA)  linear discriminant analysis(LDA)  nondestructive analysis
引用本文:杨璐,黄建华,陈欣楠,吕竑树,王丽琴,苏伯民.漫反射光谱结合化学计量学方法无损分析彩绘文物颜料[J].分析测试学报,2020,39(7):844-850.
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