科研之友
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摘要
With the development of ultrafast laser cold micromachining, ultrafast laser has been gradually investigated and applied on the protection of cultural relics. According to the application requirements of cleaning the surface pollutants of the ancient city wall cultural relics, the marble cultural relics and surface pollutant simulation samples of the city wall are made, and the experimental research on the cleaning of cultural relics samples based on picosecond laser is carried out, and the effect of nanosecond laser cleaning is compared. Confocal microscope observation and fluorescence spectrometer composition analysis were used in the experiment. Change the laser cleaning parameters such as laser output energy, cleaning times and scanning speed, on the basis of not damaging the marble substrate and comprehensively considering the cleaning efficiency and cleaning effect, to optimize the experimental parameters. The experiment found that when the laser parameters are power 18W, 1000mm/s scanning speed, 8 times. After cleaning, the proportion of sulfur element decreased by 94.57%, and the surface roughness of the area after cleaning was 1.267μm. According to the proportion of pollutants after cleaning, the surface roughness, etc., the overall effect of picosecond laser cleaning marble cultural relics samples is better than that of using nanosecond laser.
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单位故宫博物院; 中国科学院大学
