Abstract In the Cultural Heritage field, stratigraphic analysis is commonly carried out by applying microscopic and micro-analytical techniques to cross-sections of micro-samples taken from artwork. This methodology provides the most comprehensive information on the object's physical structure, but necessarily implies the loss of precious or unique fragments. For this reason, sampling is rarely feasible on musical instruments having such a historical and commercial value as Stradivari or Guarneri violins. Having been played over the centuries, these masterpieces have undergone different kinds of degradation and wear, and subsequent invasive restorations. Varnish layers have therefore been thinned or even removed from the surface and other materials could have been added overlaying the original ones, with consequent variations in coating thickness and composition over time. In the present work, a novel non-destructive and non-invasive methodology combined UV-Induced Fluorescence (UVIFL) photography and reflection FT-IR spectroscopy to investigate how and to what extent varnish thicknesses vary on the surface of historical violins as well as to reconstruct the stratigraphic layer order and chemical composition. Firstly, UV-induced variations and IR diagnostic bands were identified on numerous model samples reproducing musical instrument stratigraphy. Then the methodology was applied to the study of several Stradivari and Guarneri violins and its limitations and strengths were showed in three representative case studies.

中文翻译：

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通过反射 FT-IR 光谱和紫外诱导荧光技术进行的非侵入性地层研究：以历史小提琴为例

摘要 在文化遗产领域，地层分析通常是通过将微观和微观分析技术应用于从艺术品中提取的微观样本的横截面来进行的。这种方法提供了关于物体物理结构的最全面的信息，但必然意味着珍贵或独特碎片的丢失。出于这个原因，对具有历史和商业价值的乐器（如 Stradivari 或 Guarneri 小提琴）进行采样很少可行。经过几个世纪的演奏，这些杰作经历了不同种类的退化和磨损，以及随后的侵入性修复。因此，清漆层已被减薄甚至从表面去除，并且可以添加其他材料覆盖原始材料，随着时间的推移，涂层厚度和成分会随之发生变化。在目前的工作中，一种新的非破坏性和非侵入性方法结合了紫外线诱导荧光 (UVIFL) 摄影和反射 FT-IR 光谱，以研究历史小提琴表面上清漆厚度的变化方式和程度，以及重建地层层序和化学成分。首先，在再现乐器地层学的大量模型样本上确定了紫外线引起的变化和红外诊断带。然后将该方法应用于几把 Stradivari 和 Guarneri 小提琴的研究，并在三个代表性案例研究中展示了其局限性和优势。一种新型的非破坏性和非侵入性方法，结合了紫外线诱导荧光 (UVIFL) 摄影和反射 FT-IR 光谱，以研究历史小提琴表面上清漆厚度的变化方式和程度，以及重建地层顺序和化学成分。首先，在再现乐器地层学的大量模型样本上确定了紫外线引起的变化和红外诊断带。然后将该方法应用于几把 Stradivari 和 Guarneri 小提琴的研究，并在三个代表性案例研究中展示了其局限性和优势。一种新型的非破坏性和非侵入性方法，结合了紫外线诱导荧光 (UVIFL) 摄影和反射 FT-IR 光谱，以研究历史小提琴表面上清漆厚度的变化方式和程度，以及重建地层顺序和化学成分。首先，在再现乐器地层学的众多模型样本上确定了紫外线引起的变化和红外线诊断带。然后将该方法应用于几把 Stradivari 和 Guarneri 小提琴的研究，并在三个代表性案例研究中展示了其局限性和优势。