Imaging-based inspection techniques have practical advantages in the study and/or rehabilitation of artworks. They provide in some cases internal information on the status of the sample to be inspected. On the one hand, techniques based on active infrared thermography (IRT) are advantageous to obtaining complete images of the inspected parts, although a technical interpretation performed by a team of experts in non-destructive testing (NDT) techniques is needed above all when the target is composed, as in our case, by different materials. On the other hand, optical coherence tomography (OCT) is slow when inspecting complete parts, but it has great level of structural detail in subsurface measurements up to 3 mm. The complementary use of these two techniques, and its application to a very ancient marquetry sample with an unusual tessellatum layer, is presented herein. The plan size of the sample is 208 × 212 mm, while the tessellatum is 1.5 mm thick. Starting from thermal imaging inspections, using step-heating (SH) and pulsed thermography (PT), a defect map has been defined. Structural details of these defects using OCT will help the restorer in charge of the restoration process to perform a satisfactory work.

中文翻译：

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主动红外热成像和光学相干断层扫描在古代镶嵌物无损检测中的互补应用

基于成像的检查技术在艺术作品的研究和/或修复方面具有实际优势。在某些情况下，它们会提供有关待检查样品状态的内部信息。一方面，基于主动红外热成像 (IRT) 的技术有利于获得被检测部件的完整图像，尽管在无损检测 (NDT) 技术专家团队进行的技术解释时，首先需要的是在我们的例子中，目标由不同的材料组成。另一方面，光学相干断层扫描 (OCT) 在检查完整零件时速度较慢，但​​在高达 3 毫米的地下测量中具有很高的结构细节水平。这两种技术的互补使用，以及将其应用于具有不寻常镶嵌层的非常古老的镶嵌样品，在此提出。样品的平面尺寸为 208 × 212 mm，而镶嵌的厚度为 1.5 mm。从热成像检查开始，使用步进加热 (SH) 和脉冲热成像 (PT)，定义了缺陷图。使用 OCT 获取这些缺陷的结构细节将有助于负责修复过程的修复者完成令人满意的工作。