光学相干断层成像技术在定窑瓷器检测中的应用

Non-Invasive Investigation of Microstructure of Ding Kiln Porcelain with Optical Coherence Tomography

光学相干断层成像(OCT)是基于低相干光干涉仪,可对物体进行断层成像的技术。OCT系统的无损检测和图像高速采集特征使其适于对历史文物进行成像检测,并提供文物表面下的结构信息。对OCT技术原理进行了阐述,并采用OCT系统对来自北宋的定窑瓷器进行无损检测及断层图像的采集。通过定窑瓷器的OCT断层图像,可观察到定窑瓷器表层釉质和胎体层,层状结构以及不同结构的界面也清晰可见。通过对OCT断层图像的分析,可获知瓷器表面的施釉情况及釉层特点,釉层和胎体的风化特征及其中气泡及晶体颗粒的分布、OCT图像对瓷器的穿透深度等信息。同时可分析釉层和胎体表面工艺以及二次修补的信息。

Optical coherence tomography （OCT） is a non-destructive subsurface tomography system based on low coherence interferometry. Non-invasive nature and high speed of acquisition of OCT make it possible to image relic and provide subsurface morphology visualization. Porcelain from Ding kiln of Northern Song Dynasty is scanned and imaged to visualize the subsurface morphology of the surface glaze and core. Layer structures and interfaces can be visualized clearly from OCT images. The characteristics of the thickness of the glaze layer, bubbles and crystal particles in glaze, the penetration depth of OCT in porcelain are analyzed.