![]() ![]() Este es el caso de los más de 400 museos de la Provincia de Buenos Aires.Įl laboratorio de Ablación, Limpieza y Restauración con Laser del CIOp ha desarrollado un sistema de registro 3D de bajo costo y fácil de implementar, basado en fotogrametría digital y software libre. Si bien estas aplicaciones se llevan a cabo desde hace tiempo a nivel internacional, no ocurre así en nuestro país, donde los sistemas de documentación y difusión, son en general fotográficos y no incluyen el registro por imágenes 3D. Permite además el análisis temporal de deterioros en los bienes culturales y posibilita realizar medidas a escala real de la totalidad del objeto sin necesidad de manipular la pieza. Este tipo de registro permite la documentación de colec ciones y la visualización virtual de objetos con fines de investigación, didácticos y de difusión, reduciendo los riesgos de manipulación para el patrimonio. In the end detailed results are presented, demonstrating the improvement of the final model, and how the proposed sensor fusion ensure a pre-specified level of accuracy.Įn los últimos años, el uso del registro de imágenes 3D está teniendo un fuerte impacto en áreas como museología, arqueología y antropología. To circumvent this difficulty we propose an alignment technique based on the fusion of ICP with close-range digital photogrammetry and a non-invasive procedure in order to generate a final accurate model. Such control has demonstrated how, in some situations, the ICP-based alignment can lead to incorrect results. Since the scientific focus is centered on the 3-D model overall dimensional accuracy, a methodology for its quality control is described. The paper reports all the steps of the acquisition procedure, from the project planning to the solution of the various problems due to range camera calibration and to material non optically cooperative. In this paper, the acquisition process of the 3-D digital model of the Maddalena by Donatello, a wooden statue representing one of the major masterpieces of the Italian Renaissance which was swept away by the Florence flood of 1966 and successively restored, is described. However, the routine application of three-dimensional (3-D) modeling to Heritage conservation still requires the systematic investigation of a number of technical problems. Three-dimensional digital modeling of Heritage works of art through optical scanners, has been demonstrated in recent years with results of exceptional interest. ![]() We also apply LIBS to the determination of the composition of acheological objects belonging to different pre-Columbian cultures. In particular, we show applications to the identification of trace elements in Hominide teeth, of interest concerning the analysis of eating habits. On the other hand, we use the spectroscopic analysis of the plasma generated as a result of laser ablation (LIBS- laser Induced Breakdown Spectroscopy-) for the determination of the elementary composition of unique pieces in anthropology and archaeology. Damage fluence thresholds for 17 different XIXth century types of papers, made by processing textiles, were determined. On one hand, treatments of fabrics, coins, bones, and other archeological objects are shown, as well as applications to the preservation of covers, front of books and old manuscripts made in rag paper. We also demonstrated low-threshold microlasers, based on whispering gallery mode spherical resonators, fabricated in different oxide glasses.Surface ablation with nanosecond laser pulses was applied to preservation, cleaning and compositional identification of objects of cultural value. Both of them exhibit a wide emission bandwidth and seem quite promising for broadband optical amplifiers. As to the former application, two classes of silica glasses have been produced and investigated, namely a melted soda-lime-alumino-silicate glass and a sol-gel silica-hafnia glass. Here we present some results we have obtained in the development of different silica-based glasses and in their application to the production of integrated optical amplifiers and microspherical lasers. Oxide-glass matrices, in particular, offer the advantage of relatively simple fabrication processes-both for bulk glasses and optical fibers-and have demonstrated quite good properties in the 1.5 µm wavelength band. Abstract : Er3+ -doped glasses have been a subject of great interest in the recent years for their application in the areas of guided wave optical amplifiers and lasers. ![]()
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