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

2003; Elsevier BV; Volume: 4; Linguagem: Inglês

10.1016/s1296-2074(02)01227-x

1778-3674

R. M. Esbert, Carlota M. Grossi, Araceli Rojo, F. J. Alonso, M. Montoto, Jorge Ordaz, M.C Pérez de Andrés, Carlos Escudero, Mercedes Barrera, Eduardo Sebastián, Carlos Rodríguez‐Navarro, Kerstin Elert,

Building materials and conservation

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.