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Application limits of Q-Switched Nd: YAG laser irradiation for stone cleaning based on colour measurements

Author:
Esbert Alemany, Rosa MaríaUniovi authority; Grossi Sampedro, Carlota MariaUniovi authority; Rojo Álvarez, Araceli; Alonso Rodríguez, Francisco JavierUniovi authority; Montoto San Miguel, ModestoUniovi authority; Ordaz Gargallo, JorgeUniovi authority; Pérez de Andrés, María del Carmen; Escudero Remírez, Cristina; Barrera del Barrio, Mercedes; Sebastián Pardo, Eduardo; Rodríguez Navarro, Carlos; Elert, Kerstin
Publication date:
2003
Citación:
Journal of cultural heritage, 4, p.50-55, (2003)
Descripción física:
p. 50-55
Abstract:

The application limits of the laser-cleaning technique for different types of building stones have been investigated by measuring colour variations. The selected stones differ in their chemical and mineralogical composition, colour, texture and crystallinity degree. The experimentation was carried out with a Q-switched Nd:YAG laser. The colour variations on stones associated with different operative fluences were measured using a colorimeter. Further, surface morphological changes were examined under SEM. From the calculation of colour differences, a damage threshold fluence was established for each stone type. The response of the stones to laser radiation at a particular fluence was found to be mainly conditioned by their chemical and mineralogical composition and, to a less extent, by their textural characteristics.

The application limits of the laser-cleaning technique for different types of building stones have been investigated by measuring colour variations. The selected stones differ in their chemical and mineralogical composition, colour, texture and crystallinity degree. The experimentation was carried out with a Q-switched Nd:YAG laser. The colour variations on stones associated with different operative fluences were measured using a colorimeter. Further, surface morphological changes were examined under SEM. From the calculation of colour differences, a damage threshold fluence was established for each stone type. The response of the stones to laser radiation at a particular fluence was found to be mainly conditioned by their chemical and mineralogical composition and, to a less extent, by their textural characteristics.

URI:
http://hdl.handle.net/10651/8650
ISSN:
1296-2074
Patrocinado por:

This research was financially supported by the CICYT - Spain (Project 1FD97-0331 - C03-01)

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