Laser cleaning of historical sandstone and the surface discoloration due to gas shielding

Marta Jankowska; Gerard Śliwiński

doi:10.1117/12.625800

11 October 2005 Laser cleaning of historical sandstone and the surface discoloration due to gas shielding

Marta Jankowska, Gerard Śliwiński

Proceedings Volume 5958, Lasers and Applications; 59583A (2005) https://doi.org/10.1117/12.625800
Event: Congress on Optics and Optoelectronics, 2005, Warsaw, Poland

Abstract

For the Gotlandic sandstone samples extracted from historical monuments and covered with model encrustation the effect of pulsed, ablative laser cleaning at 1064 nm on the surface discoloration was investigated for the irradiation in ambient air and in the N₂ flow at various velocities. The colorimetric data of a sufficiently large sample population were measured. A slightly stronger decrease in the surface lightness for the artificially coated and also pure substrate samples irradiated in nitrogen compared to the ambient air case were observed. This difference was ascribed to material oxidation and partial combustion of surface remnants due to presence of O₂ contributing to the final effect of laser cleaning.

Citation Download Citation

Marta Jankowska and Gerard Śliwiński "Laser cleaning of historical sandstone and the surface discoloration due to gas shielding", Proc. SPIE 5958, Lasers and Applications, 59583A (11 October 2005); https://doi.org/10.1117/12.625800

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