为有效清除汉白玉石质文物表面油漆，在利用面积外推法和激光诱导等离子体光谱法（laser-induced plasma spectroscopy, LIPS）获取金色、银色油漆层和汉白玉三种物质表面的烧蚀阈值功率的基础上，确定了在不损伤汉白玉基底前提下清除油漆的最佳激光功率。利用图像法研究了激光清洗10 mm×10 mm汉白玉表面金色、银色油漆的清洗度以及清洗速率变化趋势，获取最佳激光光斑搭接率和最佳清洗次数。采用图像法对激光清洗汉白玉表面油漆层的清洗效果进行评估。93%以上的清洗度表明，面积外推法、LIPS法和图像法的协同使用可有效提高汉白玉表面油漆层的激光清洗效率。
Abstract
In order to effectively remove the surface paint of the cultural relic of white marble, the area extrapolation method and laser-induced plasma spectroscopy (LIPS) method were used to obtain the ablation threshold power of the gold, silver paint layer and white marble surface. On the basis of this, the optimal laser power for removing paint without damaging the white marble substrate was determined. The image processing method was used to study the cleaning degree and variation trend of cleaning rate of the gold and silver paint on the surface of 10 mm×10 mm white marble by laser cleaning, and the optimal laser spot overlap rate and the optimal cleaning times were obtained. Finally, the image processing method was used to evaluate the cleaning effect of laser cleaning of paint layer on the white marble surface. More than 93% of the cleaning degree shows that the synergistic use of the area extrapolation method, LIPS method and image processing method can effectively improve the laser cleaning efficiency of the paint layer on white marble surface.
关键词
汉白玉 /
LIPS法 /
银色油漆 /
金色油漆 /
图像法 /
激光清洗
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Key words
laser cleaning /
white marble /
silver paint /
gold paint /
LIPS method /
image processing method
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基金
陕西省教育厅服务地方专项计划项目（19JC040）；陕西省省重点研发计划项目（2020GY-118）；国家重点研发计划项目（2017YFB0405102）
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脚注
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