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Proceedings Paper

The influence and use of the SFR or LQS Nd:YAG laser beam on the cleaning and restoration of two diverse church facades
Author(s): Ida Marie Catalano; S. E. Andriani; R. Laviano; F. Vona; Giuseppe Daurelio; G. Stea
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Paper Abstract

The present experimental study and job, still in progress, were conceived not only for an evaluation of the effectiveness of laser cleaning technique but also for comparing two different laser pulse duration of a Nd:YAG laser: Short Free Running (SFR) with a pulse duration of td=20μs and Long Q-Switched (LQS) with a pulse duration of td=70ns. The samples were carried out by the facades of teh Cathedral of Troia and of the Church of Molfetta, both in the South of Italy. All laser cleaning experiments were carried out in "wet condition" by using some distilled water on the encrustation before the irradiation. Surface analytical techniques, such as Optical Microscopy (OM), X-Ray Diffraction (XRD), Fourier-Transform InfraRed spectroscopy (FTIR), and Scanning Electron Microscopy (SEM) coupled with Energy Xpray Dispersive analysis (EDX)were used to detect crust chemical composition and morphology, as well as, to monitor the effects induced by the laser treatments. On the basis of these structural and analytical examinations, both the lasers have shown to be appropriate for achieving a sufficient removal of the selected layers without modifying the surface morphology and keeping the preservation of the "patina/treatment" layer.

Paper Details

Date Published: 23 March 2005
PDF: 6 pages
Proc. SPIE 5777, XV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, (23 March 2005); doi: 10.1117/12.611321
Show Author Affiliations
Ida Marie Catalano, Univ. degli Studi di Bari (Italy)
S. E. Andriani, Univ. degli Studi di Bari (Italy)
R. Laviano, Univ. and Polytechnic of Bari (Italy)
F. Vona, Soprintendenza della Puglia Ai Beni Ambientali Architettonici Artistici (Italy)
Giuseppe Daurelio, INFM (Italy)
Univ. and Polytechnic of Bari (Italy)
G. Stea, Private Geologist (Italy)

Published in SPIE Proceedings Vol. 5777:
XV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers
Jarmila Kodymova, Editor(s)

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