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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:23 |
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Conference: Bucharest University Faculty of Physics 2004 Meeting
Section: Optics, Spectroscopy, Plasma and Lasers
Title:
MicroLASER x-y and x-y-z
Authors:
Luminita Constantin, Cristian Deciu, Walter Maracineanu, Ion Marcel, Maria Nutu, Roxana Radvan, Adrian Sima, Joakim Striber,
Affiliation:
National Institute of Research and Development for Optoelectronics
Centre for Restoration by Optoelectronical Techniques
Bucharest – Romania
E-mail
Keywords:
Abstract:
This paperwork presents the laser-microscope systems for high precision artwork cleaning. This systems are interesting due to their characteristics: high accuracy for delicate cleaning operations, high control of laser spot shape / adjustable parameters, accurate aiming system for high precision cleaning control.
Laser cleaning applied in artwork restoration has proven during time a very powerful technique offering unmatched results in certain fields of interest. Laser beam is a safe, nonpolluting, cleaning tool. For accurate cleaning a fine tunable laser was associated with a microscope which has also the possibility to record in digital format images and short movies with cleaned surfaces. Micro LASER x-y system consists in a microscope and a Q-switched laser Nd:YAG at 1064 nm working together.
Nd:YAG laser proved to be a good tool for artwork cleaning procedures. This paperwork presents results from cleaning of the following materials and artifacts: stamp, silver jewelry, icons, other objects.
Working regimes for cleaning on stamps are strongly dependent by: paper sort, printing colors sort, paper’s absorbency, and superficial layer quality. If the superficial layer is more resistant than the substrate, removal of both layers is hardly possible and destruction of the surface is imminent.
Metals are materials that absorb very well infrared radiation. Their temperature rises in very short time to some thousands of Kelvin degrees. This process leads to encrustation expulsion from the metal surface due to metal dilatation. This fact suggests that Nd:YAG laser is suitable for metal cleaning. Jewelry and other small precious metal objects can be cleaned with this type of laser.
This system was also used for dirt removal from an icon. Different areas were laser cleaned adjusting properly the laser beam. Dark varnish, silver sheet, new added paint were cleaned safely at the icon surface. The results proved that MicroLASER x-y, using Nd:YAG laser is good also for painted surfaces using appropriate settings.
Newly developed MicroLASER x-y-z is a step forward in maneuverability and It can be used on site applications , even on scaffolding. . The microscope objective is placed on an articulated arm. The laser beam is directed along the arm articulations.
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