IngentaConnect In Situ Analytical Assessment and Chemical Imaging of Historical ...

Authors: Fortes, F.J.¹; Cuñat, J.¹; Cabalín, L.M.¹; Laserna, J.J.¹

Source: Applied Spectroscopy, Volume 61, Issue 5, Pages 94A-102A and 459-569 (May 2007) , pp. 558-564(7)

Publisher: Society for Applied Spectroscopy

Abstract:

In this work, the capability of laser-induced breakdown spectrometry for the in situ analytical assessment and chemical mapping of the façade of the cathedral of Malaga (Spain) has been demonstrated. The task required the use of a portable laser analyzer that allowed real-time spectral acquisitions in the field. A man-portable laser, based on a Q-switched Nd:YAG laser operating at its fundamental wavelength, has been utilized to generate a LIBS plasma of the sample surface. A chemical characterization of the different materials employed in the construction of this building has been performed. The purpose of this study was to use LIBS spectrochemical analysis to qualitatively discriminate between sandstone, limestone, marble, and cement mortar, which are the main components used in this class of historical monument. The field analysis was performed in two zones: the northern façade and the "girola"; the total areas of analysis of the two regions were 250 m² and 650 m², respectively. Chemical images of Si/Ca and Ca/Mg ratios from both parts of the building were generated. During the measurement campaign, a protocol of analysis was chosen so as to achieve an accurate description of the building materials with respectable spatial resolutions.

Keywords: LASER-INDUCED BREAKDOWN SPECTROMETRY; LIBS; CHEMICAL MAPPING; MAN-PORTABLE LASER; HISTORICAL BUILDINGS; MATERIALS CHARACTERIZATION

Document Type: Research article

DOI: 10.1366/000370207780807722

Affiliations: 1: Department of Analytical Chemistry, Faculty of Sciences, University of Malaga, Campus de Teatinos s/n, 29071 Malaga

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In Situ Analytical Assessment and Chemical Imaging of Historical Buildings Using a Man-Portable Laser System