Results 201 to 210 of about 33,941 (261)
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Laser cleaning of surface contaminants
Applied Surface Science, 1998Abstract Laser cleaning effect can be produced on a surface using pulsed laser irradiation, with pulse duration typically 1 to 100 ns, fluence typically tens to hundreds of mJ/cm2, and wavelengths typically in the 200 to 300 nm range. A thin liquid film can be used to enhance the removal efficiency of small particulates; this is called `steam laser ...
Costas Grigoropoulos
exaly +2 more sources
Laser cleaning of a bronze bell
Applied Surface Science, 2013Abstract In this paper we report the experimental results of the study of evaluation of an UV laser cleaning treatment on a bronze bell outdoor, dating from the second half of the 600. Energy dispersive X-ray fluorescence (EDXRF) non-destructive analysis was performed on the bell before, during and after the cleaning treatment in order to assess the
Giovanni Buccolieri +2 more
exaly +3 more sources
Diode laser potential in laser cleaning of stones
SPIE Proceedings, 2001In this work we investigated for the first time the laser cleaning process of encrusted stones by employing a high power diode laser system. The test have been carried out using a Rofin-Sinar mod. DL025S emitting up to 2.5 kW CW power to clean various samples representing natural encrustation by pollution exposition and graffiti, typically encountered ...
Salimbeni R +5 more
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Laser cleaning of paintings: from preliminary investigations to a laser cleaning station
SPIE Proceedings, 2010UV laser beam interaction with painting layers in case of aged mock-ups was investigated and ablation and cleaning thresholds were estimated as a function of each layer and sub-layer composition. Ablation depth measurements as a function of incident laser intensities and subsequent irradiation pulse number was measured with white light ...
I. Apostol +8 more
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Laser Cleaning with a Nd:YAG Laser
1997In this paper the practical aspects of laser cleaning a small area of the exterior of Lincoln Cathedral will be presented. Surface analysis results and the optimum cleaning rates will be discussed with the objective of the preservation of the limestone patina.
Paraskevi Pouli, David C. Emmony
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Laser cleaning on bronze artefacts by the XeCl laser
Optik, 2021Abstract In this paper, bronze samples from Bam Arg World Heritage for laser cleaning with XeCl laser is investigated. The sample is analyzed before and after laser cleaning by XRD, DAX, SEM and PIXE methods to determine their surface impurities then optimum conditions such as the repetition rate and number of laser pulses obtain for laser cleaning.
S. Jelvani +4 more
openaire +1 more source
ICALEO 2000: Proceedings of the Laser Materials Processing Conference, 2000
A new type of laser processing called “laser shock cleaning” in which the removal of the small particles is carried out by shock waves produced by laser sparking in air, is reported. The removal of very small metal particles (less than 1 μm in diameter) from silicon wafer surfaces was demonstrated successfully by this new technique.
J. M. Lee, K. G. Watkins, W. M. Steen
openaire +1 more source
A new type of laser processing called “laser shock cleaning” in which the removal of the small particles is carried out by shock waves produced by laser sparking in air, is reported. The removal of very small metal particles (less than 1 μm in diameter) from silicon wafer surfaces was demonstrated successfully by this new technique.
J. M. Lee, K. G. Watkins, W. M. Steen
openaire +1 more source
Optics and Lasers in Engineering, 1991
Abstract The pulse lasers, YAG-, CO 2 -, and N 2 -lasers, are examined for use in the cleaning of glass. Cleaning is found to be due to the evaporation and sputtering of stains on the glass by the heat energy of the laser light. Only the N 2 laser can be used for the cleaning of the exit surface of the glass (the opposite side to the laser). A laser
Masahiro Ueda +3 more
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Abstract The pulse lasers, YAG-, CO 2 -, and N 2 -lasers, are examined for use in the cleaning of glass. Cleaning is found to be due to the evaporation and sputtering of stains on the glass by the heat energy of the laser light. Only the N 2 laser can be used for the cleaning of the exit surface of the glass (the opposite side to the laser). A laser
Masahiro Ueda +3 more
openaire +1 more source
2007
Results of laser cleaning experiments on different gilding types like leaf gilding and fire gilding are presented in this contribution by means of three tested art objects. The reflectivity of gold is advantageously high for the typical laser cleaning wavelength of 1,064 nm.
M. Panzner +5 more
openaire +1 more source
Results of laser cleaning experiments on different gilding types like leaf gilding and fire gilding are presented in this contribution by means of three tested art objects. The reflectivity of gold is advantageously high for the typical laser cleaning wavelength of 1,064 nm.
M. Panzner +5 more
openaire +1 more source