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Influence of moisture content on colour of granular materials. Part I: experiments on yellow ochre

机译:水分含量对粒状材料颜色的影响。第一部分:黄o石实验

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The water is suspected of remobilizing pigments of prehistoric painting into small worm-like heaps named vermiculations. To preserve these artworks, the moisture content of pigments must be monitored. Due to the fragility of the paintings and the technical constraints on the in situ measurements, colour measurement is proposed as a non-invasive way to access humidity. This study aims at characterizing more precisely the influence of the moisture content on the optical behaviour of yellow ochre. The light reflected by the surface of drying ochre is measured with a gonio-spectroradiometer. A scenario is proposed: the water saturation at high moisture contents is connected to the presence of a specular radiation which brings a loss of chromatic information. The evaporation of water brings the disappearance of the specular radiation and the augmentation of the diffuse radiation. These first results are promising for the development of a non-destructive in situ method of moisture measurement.
机译:人们怀疑水会把史前绘画中的颜料转移到蠕虫状的小堆中,称为ve​​r。为了保护这些艺术品,必须监控颜料的水分含量。由于绘画的易碎性以及对原位测量的技术限制,提出了颜色测量作为获取湿度的非侵入性方法。这项研究旨在更准确地表征水分含量对黄鱼光学行为的影响。干燥cher石表面反射的光用测角分光光度计测量。提出了一种方案:高水分含量下的水饱和度与镜面辐射的存在有关,这会导致色度信息的损失。水的蒸发导致镜面辐射的消失和扩散辐射的增加。这些最初的结果对于开发一种非破坏性的水分测量原位方法很有希望。

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