Journal
TALANTA
Volume 137, Issue -, Pages 182-188Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2015.01.033
Keywords
Laser-induced breakdown spectroscopy; LIBS; Remote instrument; Archeology; Underwater analysis; Multi-pulse
Categories
Funding
- Instituto Andaluz del Patrimonio Historico (IAPH) [P11-FQM-7193]
- Centro de Arqueologia Subacuatica (CAS) [P11-FQM-7193]
- University of Malaga (UMA) [P11-FQM-7193]
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LIBS analysis of submerged materials in an underwater archeological site has been performed for the first time. A fiber-optics-based remote instrument was designed for the recognition and identification of archeological assets in the wreck of the Bucentaure (Bay of Cadiz, South of Spain). The LIBS prototype featured both single-pulse (SP-LIBS) and multi-pulse excitation (MP-LIBS). The use of multi-pulse excitation allowed an increased laser beam energy (up to 95 mJ) transmitted through the optical fiber. This excitation mode results in an improved performance of the equipment in terms of extended range of analysis (to a depth of 50 m) and a broader variety of samples to be analyzed (i.e., rocks, marble, ceramics and concrete). Compared to single-pulse, an intensity enhancement factor of 15 x was observed at the same irradiance value, 1.89 GW/cm(2). Thus, a longer pulse duration promotes the heating and melting of the sample, resulting in a greater mass ablated. As a consequence of the optimization of experimental conditions performed in laboratory, underwater characterization of ancient pottery was achieved. (C) 2015 Elsevier B.V. All rights reserved.
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