光学学报, 2015, 35 (5): 0511005, 网络出版: 2015-05-06
光学相干层析成像技术对壁画的检测研究
Application of Optical Coherence Tomography in the Detection of the Mural
成像系统 相干光学 无损检测 层析成像 壁画 颜料层 地仗层 imaging systems coherent optics tomography murals nondestructive testing paint layer base layer
摘要
光学相干层析成像(OCT)是基于迈克尔孙干涉仪,可对物体内部微观结构进行无损、非接触检测的断层成像技术。考古文物的珍贵和不可再得性要求采用无损检测技术,光学相干层析成像的无损分析特点使它适用于对壁画等文物进行大范围检测。除了可对壁画表面颜料层成像,OCT 系统也可同时对其下地仗层进行断层成像,从而弥补现有技术不能对表面下内部结构进行高分辨率成像的缺点。对光学相干层析成像技术进行介绍,并针对唐墓壁画《高髻持如意仕女图》进行了成像实验,验证频域OCT 对壁画颜料层和地仗层的断层成像效果。实验表明,OCT 图像能够同时提供壁画表面颜料层及其下地仗层的信息,以及壁画存在的病害信息。OCT 可在壁画研究及修复中提供有效信息,并成为壁画等考古工作者的有力工具。
Abstract
Based on the Michelson interferometer, optical coherence tomography (OCT) is a fast, non-contact, coherent optical imaging technology. OCT can image the internal microstructure underneath the surface. Archaeological objects are valuable and thus require nondestructive testing techniques. OCT, as a non-destructive analysis technique, is suitable for testing any part of the mural and other cultural relics. High resolution OCT images can provide the detailed information of the paint layer on the surface and the ground layer underneath the surface, which is elusive for traditional techniques. The technique of OCT is introduced and the verification experiment of the mural of Tang dynasty is carried out. From OCT images, defect information of the paint layer on the mural topside and structure underneath the surface can be seen. The information is of great help to the research and repair of the mural. OCT can be used in the research and repair of murals as a powerful tool for the researchers.
杨珊珊, 朱锐, 米磊, 曹一挥, 李青云. 光学相干层析成像技术对壁画的检测研究[J]. 光学学报, 2015, 35(5): 0511005. Yang Shanshan, Zhu Rui, Mi Lei, Cao Yihui, Li Qingyun. Application of Optical Coherence Tomography in the Detection of the Mural[J]. Acta Optica Sinica, 2015, 35(5): 0511005.