Laser cleaning of stones: assessment of operative parameters, damage thresholds, and associated optical diagnostics

Salvatore Siano; F. Fabiani; D. Caruso; Roberto Pini; Renzo Salimbeni

doi:10.1117/12.378171

25 February 2000 Laser cleaning of stones: assessment of operative parameters, damage thresholds, and associated optical diagnostics

Salvatore Siano, F. Fabiani, D. Caruso, Roberto Pini, Renzo Salimbeni

Author Affiliations +

Proceedings Volume 4070, ALT '99 International Conference on Advanced Laser Technologies; (2000) https://doi.org/10.1117/12.378171
Event: ALT'99 International Conference: Advanced Laser Technologies, 1999, Potenza-Lecce, Italy

Abstract

After a general discussion about the optimum laser pulse duration for laser cleaning of stone artworks, we present a basic study aimed to state a methodological approach to optimize restoration interventions. As representative examples we investigated the cleaning problem of black crust removal from pliocene sandstone and marble of Siena. The trials were performed with a shot free running Nd:YAG on quarry samples, and on sample from historical buildings. Optical and thermal analyses, associated with petrological diagnostics of the irradiation effects, allowed to derive the damage thresholds and to understand the nature of any invasive phenomenon. The analysis of the experimental results provided the best irradiation conditions and the laser parameter ranges for a safe laser cleaning intervention of the lithotypes and degradation typologies here investigated.

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Salvatore Siano, F. Fabiani, D. Caruso, Roberto Pini, and Renzo Salimbeni "Laser cleaning of stones: assessment of operative parameters, damage thresholds, and associated optical diagnostics", Proc. SPIE 4070, ALT '99 International Conference on Advanced Laser Technologies, (25 February 2000); https://doi.org/10.1117/12.378171

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