Laser cleaning method of building stone or stone cultural relics
A technology for laser cleaning and stone cultural relics, applied in the field of laser applications, can solve the problems of low cleaning efficiency, poor cleaning effect, low repetition frequency, etc., and achieve the effect of high cleaning efficiency, high laser repetition frequency and good cleaning effect.
Inactive Publication Date: 2012-06-20
LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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Problems solved by technology
[0005] In addition, the laser cleaning method for decoration and stone cultural relics seen in the current public literature is to use a neodymium-doped yttrium aluminum garnet (Nd:YAG) laser for cleaning. The pulse width is on the order of nanometers to micrometers, and the repetition frequency is several Hertz to dozens of hertz, the cleaning mechanism is mainly to use the large difference in the absorption coefficient of the stone substrate and the surface pollutants to the laser to remove the pollutants. When the absorption coefficient of the substrate and the surface pollutants is not much different , the cleaning effect is not good, and its repetition frequency is not high, and the cleaning efficiency is low
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Embodiment Construction
[0019] The laser cleaning method of the present invention selects Nd:YAG solid-state laser to clean the sandstone with ink stain on the surface, the laser wavelength is 1064nm, the pulse width is 11.7ns, and the frequency is 1Hz. Focus the laser so that the diameter of the laser spot on the sample surface is 3mm.
[0020] Lasers with different laser energy densities were used to irradiate different positions on the surface of the sandstone sample with no pollution on the surface, and each position was irradiated 10 times. Before and after laser irradiation, Nikon ECLIPSE E600 optical microscope was used to observe the surface morphology of the sample and the weighing method of electronic balance was used to judge whether the sample was damaged. By monitoring the surface morphology of the sample and the weight change of the sample before and after laser irradiation, it was found that when the laser energy density was 1.20J / cm 2 When , the loss of sample mass jumps, and the los...
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Abstract
The invention relates to a laser cleaning method of building stone or stone cultural relics. The laser cleaning method comprises the following steps that: before laser cleaning, the surface of a stone material which the material of which is same as that of an object to be cleaned and has no pollution on the surface is radiated by laser, and the damage threshold of a substrate is obtained; then laser which is lower than the damage threshold is used for cleaning the building stone or stone cultural relics, so that the damage problem during a cleaning process is avoided. The solid laser of a xenon lamp pump or a laser diode pump is used for cleaning, so that the cleaning problem when the difference between the absorption coefficients of the substrate and a surface pollutant to the laser is not big and the problem of low cleaning efficiency can be solved.
Description
technical field [0001] The invention belongs to the technical field of laser application, and in particular relates to a laser cleaning method for building stone or stone cultural relics. Background technique [0002] During the long-term preservation of building stone or stone cultural relics, due to natural weathering, human activities, biological erosion, and environmental pollution, surface pollutants of different types and degrees appear on the surface. These surface pollutants not only affect the appearance, but the harmful components in it more seriously threaten the preservation of building stones or stone cultural relics. And change building stone, cost is too high, and stone cultural relic is priceless especially, therefore, research removes the cleaning technology of building stone or stone cultural relic surface pollutant to have important social significance and bigger economic significance. [0003] At present, the surface pollutant removal technologies of bui...
Claims
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IPC IPC(8): B08B7/00
Inventor 叶亚云袁晓东齐扬程晓锋王海军栾晓雨苗心向秦朗王洪彬赵龙彪贺群马志强
Owner LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS