We report on advance developments of terahertz system data analysis for measuring the thicknesses of multiple films for non-contact control in heritage science. We provide the analysis of time-domain data regarding the measurements conducted on a French Renaissance painting realized on a copper substrate. The piece of art is made of a varnish layer deposited on the different painting layers. We specifically focus on the dielectric characterization of the varnish layer and its ageing consequences on THz images that are also reported here and revealed optically hidden details.

中文翻译：

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清漆老化的表征及其对太赫兹图像的影响：在法国文艺复兴时期推测的绘画上的演示

我们报告了太赫兹系统数据分析的进展，这些数据用于测量遗产科学中非接触式控制的多层膜的厚度。我们提供有关在铜基板上实现的法国文艺复兴时期绘画进行的测量的时域数据分析。艺术品由沉积在不同绘画层上的清漆层制成。我们特别关注清漆层的介电特性及其在太赫兹图像上的老化结果，这些结果也在此处报道，并揭示了光学隐藏的细节。