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首页> 外文期刊>Applied Spectroscopy: Society for Applied Spectroscopy >Analytical Spectroscopic Investigation of Wavelength and Pulse Duration Effects on Laser-Induced Changes of Egg-Yolk-Based Tempera Paints
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Analytical Spectroscopic Investigation of Wavelength and Pulse Duration Effects on Laser-Induced Changes of Egg-Yolk-Based Tempera Paints

机译：波长和脉冲持续时间对蛋黄基蛋彩涂膜激光诱导变化影响的光谱分析研究

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The application of laser cleaning methodologies to light-sensitive substrates such as those encountered in artistic paintings is an extremely delicate issue. The cleaning of paintings and polychromes is an irreversibly invasive intervention; therefore, prior to the implementation of laser cleaning methodologies, a thorough characterization of the interaction between laser pulses and painting components is required. In this work, the modifications induced by irradiation with pulses of 150 picoseconds (at 1064 and 213 nm) and 15 nanoseconds (at 213 nm) on unvarnished aged model egg-yolk-based paints were examined following a spectroanalytical approach. Laser-induced chemical changes on samples of unpigmented and widely used artist's pigment temperas were investigated by spectrofluorimetry and Fourier transform Raman spectroscopy, while color changes were quantified by colorimetry. Noticeable modifications of the Raman and fluorescence bands attributed to pigments are absent except for vermillion, for which the pigment bands tend to disappear upon irradiation at 1064 nm. Interestingly, no discoloration was observed on most of the pigments upon irradiation at 213 nm (150 ps), including the light-sensitive vermillion, while no indications of carbonization or charring of the paint layers, which could give rise to amorphous carbon bands, were obtained at any of the irradiation conditions explored. Comparison of the results using the two different pulse durations and wavelengths illustrates the participation of mechanisms of diverse origin according to the chemical composition of the pigment and highlights the importance of the optimization of the laser parameters, specifically fluence, pulse duration, and wavelength, in conservation treatments of paintings.
机译：将激光清洁方法学应用于诸如艺术绘画中遇到的那些光敏基材是极其微妙的问题。绘画和彩色颜料的清洁是不可逆的干预。因此，在实施激光清洁方法之前，需要对激光脉冲与喷漆组件之间的相互作用进行全面的表征。在这项工作中，按照光谱分析方法，检查了在未上漆的老化模型蛋黄基涂料上用150皮秒（在1064和213 nm下）和15纳秒（在213 nm下）的辐照引起的改性。通过荧光光谱法和傅里叶变换拉曼光谱法研究了未着色和广泛使用的艺术家的颜料色温样品上的激光诱导的化学变化，同时通过比色法对颜色变化进行了定量。除了朱红色以外，不存在归因于颜料的拉曼光谱和荧光带的显着修饰，因为朱砂的色素带在1064 nm照射时趋于消失。有趣的是，在包括感光朱红在内的213 nm（150 ps）辐射下，大多数颜料都没有观察到变色，而没有迹象表明漆层会碳化或炭化，这会引起无定形碳带。在任何探索的照射条件下获得。使用两种不同的脉冲持续时间和波长进行的结果比较表明，根据颜料的化学成分，有多种机理参与其中，并强调了优化激光参数（特别是能量密度，脉冲持续时间和波长）的重要性。绘画的养护方法。

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