The restoration of an art object should be as minimal as possible but also as much as necessary. A previous accurate analysis of the object is therefore essential. In the present work, we show how THz time-of-flight tomography can contribute to the determination of the actual state of a three-dimensional object. We investigated the sub-surface structure of a wooden putto (wood carving of an infant) with a robotic THz time-domain system. With the system it is possible to investigate delamination of polychrome and preparation layers as well as damages on the wooden substrate due to insect tunneling. In addition, the technique enables the restorer to find hidden damages of the object that cannot be seen by visual inspection only.

中文翻译：

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使用基于机器人的太赫兹断层扫描技术研究木头上的层状结构和昆虫隧道

艺术品的修复应尽可能少，但也应尽可能多。因此，必须事先对对象进行准确分析。在目前的工作中，我们展示了太赫兹飞行时间断层扫描如何有助于确定三维物体的实际状态。我们使用机器人太赫兹时域系统研究了木头（婴儿木雕）的次表面结构。借助该系统，可以调查彩绘层和准备层的分层以及由于昆虫隧道而对木质基材造成的损坏。此外，该技术使修复人员能够发现仅通过目测无法看到的物体的隐藏损坏。