Laboratorio de Ablación Láser, Fotónica e Imágenes 3D (LALFI)

Caracterización geomorfológica y geoarqueológica de los sitios Tambillo Nuevo y Tambillo Viejo de la Sierra de Zapata (Catamarca, noroeste argentino)

Thu, 01 Jan 2026 00:00:00 GMT

Objeto de conferencia Geomorphological and geoarchaeological characterization of the Tambillo Nuevo and Tambillo Viejo sites of the Sierra de Zapata (Catamarca, northwest Argentina) XXII Congreso Nacional de Arqueología Argentina (Buenos Aires, 27 al 31 de julio de 2026); Libro de resúmenes. XXII Congreso Nacional de Arqueología Argentina El objetivo de este trabajo es caracterizar las unidades geológico-geomorfológicas y analizar los depósitos sedimentarios mediante el uso de cartografía, perfiles estratigráficos, descripción del sustrato y cortes transversales obtenidos con tecnología LiDAR en los sitios arqueológicos Tambillo Nuevo y Tambillo Viejo de la Sierra de Zapata. Los sitios se ubican en la localidad de Londres, departamento de Belén, a una distancia de 16,64 km en línea recta al suroeste del sitio incaico de El Shincal de Quimivil. Se emplazan sobre el piedemonte oriental de la Sierra de Zapata, a ambos lados del cauce seco del río El Tambillo. Otro punto de referencia relevante es su proximidad a la actual Ruta Provincial 3 (antigua Ruta Nacional 40), que comunica Londres con Tinogasta, en el oeste de la provincia de Catamarca. El área de estudio forma parte del sistema de las Sierras Pampeanas Noroccidentales, que se extiende por el centro y sur de la provincia de Catamarca. Este sistema se caracteriza por la presencia de valles longitudinales y angostos, así como amplios bolsones intermontanos rodeados por bloques o cordones montañosos elevados.

Recorridos virtuales 360: Casos: tren presidencial Museo Histórico 17 de octubre, quinta San Vicente / Un archivo todas las luchas, muestra temporaria Archivo Histórico Provincial Ricardo Levene

Wed, 01 Jan 2025 00:00:00 GMT

Objeto de conferencia XX Congreso de Historia de los Pueblos de la Provincia de Buenos Aires (La Plata, 3 y 4 de septiembre de 2025); XX Congreso de Historia de los Pueblos Este trabajo se enmarca en un proyecto interinstitucional orientado a desarrollar soluciones tecnológicas accesibles para la salvaguarda y comunicación del patrimonio cultural, con especial foco en los museos de gestión estatal. El proyecto es llevado adelante por el Laboratorio de Tecnologías Multimediales (LTM), perteneciente al Departamento de Museos de la Dirección Provincial de Patrimonio Cultural (DPPC) de la Provincia de Buenos Aires, y el Laboratorio de Ablación Láser, Fotónica e Imágenes 3D del Centro de Investigaciones Ópticas (LALFI-CIOp). Como parte de sus resultados, se realizaron dos recorridos virtuales en 360°: Uno sobre la exposición temporaria Un archivo todas las luchas, producida por el Archivo Histórico Ricardo Levene, montada en el Museo de la Escuela Anexa Joaquín V. González UNLP, y el otro sobre el Tren Presidencial, ubicado en el Museo Histórico 17 de Octubre - Quinta San Vicente. El Departamento de Museos de la DPPC [1] define su rol bajo los principios de la museología contemporánea, transitando desde un enfoque tradicional —centrado en la conservación y estudio de colecciones— hacia un modelo de gestión colaborativa que atiende a las heterogeneidades del sistema museístico bonaerense. La Dirección Provincial de Patrimonio Cultural tiene sus orígenes en los años ‘50, en lo que fue la Comisión de Museos Lugares y Sitios Históricos que luego con los años se convirtió en una Dirección estatal. El Departamento de Museos tenía un rol muy importante porque la provincia tenía alrededor de 20 museos provinciales en su territorio que con el tiempo se fueron municipalizando. Por esos tiempos y hasta no hace tantos años, también se dedicaba a hacer relevamiento de todos los museos (nacionales, municipales, privados y mixtos), a elaborar publicaciones y a realizar asistencias técnicas a los museos que lo necesitaran. En los últimos 15 años, el área se fue transformando acorde a las exigencias de los nuevos tiempos, incluyendo una base de datos interactiva online, donde cada museo tiene su usuario y su contraseña, un mapa online donde se visualiza la numerosa cantidad de museos, y capacitaciones virtuales que permiten llegar en simultáneo a gran cantidad de trabajadores y trabajadoras de museos. Este trabajo territorial posibilitó identificar disparidades en capacidades de gestión, recursos y acceso a conocimientos, así como oportunidades para fortalecer redes interinstitucionales.

Rubens' painting as inspiration of a later tapestry: non-invasive analyses provide insight into artworks’ history

Thu, 28 Nov 2019 00:00:00 GMT

Articulo Microchemical Journal; vol. 153 The 17th century painting Madonna della Cesta by Rubens and its presumed textile reproduction created by Févère for the House of Medici were analysed in comparison. A number of non-invasive optical techniques were applied with the aim to identify similarities and differences between tapestry and painting, in order to shed light on a possible link between their respective authors. The use of a multi-analytical approach proved effective for the acquisition of iconographic, morphological, structural, and compositional information for a comprehensive characterization of the two artworks. While serving as relevant support for documentation and conservation purposes, data so obtained also provide evidence of the uncanny resemblance between the two artworks, and specifically suggest the use by Févère of the same large-scale preparatory drawing (carton) realized by Rubens for his oil painting.

Estudio histórico y recreación virtual 3D del Panteón de los Ciudadanos Meritorios -Cementerio de la Recoleta- de Carlo Zucchi

Tue, 30 Jun 2020 00:00:00 GMT

Articulo 3D Virtual Recreation of the Pantheon of the Meritorious Citizens of Carlo Zucchi Estudios del Hábitat; vol. 18, no. 1 Este trabajo presenta los resultados de la propuesta de visualización digital 3D de una hipótesis de trabajo en el marco de los avances de investigación de la tesis de maestría de una de las autoras. Se enfoca en la combinación de indagación histórica en arquitectura y arte y la utilización de técnicas de digitalización 3D (modelado y registro). Se aboca al estudio de un conjunto de monumentos funerarios del Cementerio de la Recoleta (Buenos Aires, Argentina) denominado Panteón de los Ciudadanos Meritorios, erigidos entre 1832 y 1834, existentes en la actualidad y la reconstrucción 3D del proyecto arquitectónico del Panteón a los Hombres Ilustres de la Patria. Ambos elaborados por o con la intervención de Carlo Zucchi, arquitecto-ingeniero de la Provincia de Buenos Aires en esa época. Los monumentos estudiados son los dedicados a: Cornelio Saavedra (1831); Gregorio Funes (1831); Gregorio Perdriel (1832); Marcos Balcarse (1832); Antonio Sáenz (1833) y Juan Izquierdo (fallecido en 1834).; This work presents the 3D digital visualization of a working hypothesis within the framework of the research advances of the master's thesis of one of the authors. It focuses on the combination of historical research in architecture and art and the use of 3D digitization techniques (3D modeling and 3D recording). The study of a set of funerary monuments of the Recoleta Cemetery (Buenos Aires, Argentina) called The Pantheon of Meritorious Citizens, erected between 1832 and 1834, existing today and the 3D reconstruction of the project of the Pantheon to the Illustrious Men of the Fatherland. Both elaborated by or with the intervention of Carlo Zucchi, Architect-Engineer of the Province of Buenos Aires at that time. e monuments studied are those dedicated to: Cornelius Saavedra (1831); Gregorio Funes (1831); Gregorio Perdriel (1832); Marcos Balcarse (1832); Antonio Sáenz (1833) and Juan Izquierdo (died 1834).

Photothermal therapy with silver nanoplates in HeLa cells studied by in situ fluorescence microscopy

Fri, 01 Jan 2021 00:00:00 GMT

Articulo Biomaterials Science; vol. 9, no. 7 Photothermal therapy (PTT) is a noninvasive treatment for cancer relying on the incorporation of NIRlight absorbing nanomaterials into cells, which upon illumination release heat causing thermally induced cell death. We prove that irradiation of aqueous suspensions of poly(vinylpyrrolidone)-coated silver nanoplates (PVPAgNP) or PVPAgNP in HeLa cells with red or NIR lasers causes a sizeable photothermal effect, which in cells can be visualized with the temperature sensing fluorophore Rhodamine B (RhB) using spinning disk confocal fluorescence microscopy or fluorescence lifetime imaging. Upon red-light irradiation of cells that were incubated with both, RhB and PVPAgNP at concentrations with no adverse effects on cell viability, a substantial heat release is detected. Initiation of cell death by photothermal effect is observed by positive signals of fluorescent markers for early and late apoptosis. Surprisingly, a new nanomaterial- assisted cell killing mode is operating when PVPAgNP-loaded HeLa cells are excited with moderate powers of fs-pulsed NIR light. Small roundish areas are generated with bright and fast (<1 ns) decaying emission, which expand fast and destroy the whole cell in seconds. This characteristic emission is assigned to efficient optical breakdown initiation around the strongly absorbing PVPAgNP leading to plasma formation that spreads fast through the cell.

Photonics for the virtualization of cultural heritage

Fri, 30 Jun 2023 00:00:00 GMT

Articulo Fotónica aplicada a la virtualización del patrimonio cultural Optica Pura y Aplicada; vol. 62, no. 2 This work is a brief review of the state-of-the-art of photonics applications for the virtualization of cultural heritage, focusing mainly on 3D recording and digitization techniques, virtual reality and augmented reality.We show some LALFI-CIOp's contributions: the improvement of the resolution and accuracy of 3D reconstructions by using laser speckle and the combination of different imaging techniques, such as digital photogrammetry and Reflectance Transformation imaging; the development of low-cost systems to be used by museums; and virtual and augmented reality applications for dissemination of cultural heritage.Finally, we discuss an experience of transferring 3D digitization technology to several museums and cultural heritage institutions in Argentina and we propose an approach to extend the use of photonics in this field.; Se presenta una breve revisión del estado del arte de las aplicaciones de la fotónica para la virtualización del patrimonio cultural, centradas principalmente en técnicas de registro y digitalización 3D, realidad virtual y realidad aumentada. Se muestran algunas de las contribuciones del LALFI-CIOp. Estas son: el mejoramiento de la resolución y la exactitud de las reconstrucciones 3D mediante el uso de speckle, o la combinación de fotogrametría con Structure from Motion e imágenes por transformación de reflectancia; el desarrollo de sistemas de bajo costo para su empleo en museos e instituciones culturales y aplicaciones de realidad virtual y aumentada para la difusión del patrimonio cultural. Finalmente, se discute una experiencia de transferencia de la tecnología de digitalización 3D a varios museos e instituciones de Argentina y se presentan algunas propuestas para ampliar el uso de las tecnologías de la luz en este campo.

A new method for relative Sr determination in human teeth enamel.

Sat, 01 Jan 2011 00:00:00 GMT

Articulo Journal of Anthropological Sciences; vol. 89 We present a new method to determine Sr/Ca changes in hard dental tissues based on laser ablation and spectroscopic detection. By using femtosecond Laser Induced Breakdown Spectroscopy (fs-LIBS), we micro mapped the relative amount of strontium in the enamel of three human lower third molar. We also analyzed the Sr/Ca ratio along the striae of Retzius. Results show that microlibs allows detection of variation in relative Sr/Ca ratio through enamel. The same values of Sr/Ca ratio were found along a single stria. The method has a precision better than 95% and is sensitive enough to detect Sr/Ca ratio variations among striae and within stria. Fs-LIBS generates information in a fast and simple way that can be used by non-specialists to make inferences about diet or mobility in human populations and fossil hominids.

Time resolving imaging spectroscopy applied to the analysis of plasmas generated by pulsed lasers

Sat, 01 Jan 2011 00:00:00 GMT

Articulo Journal of Physics Conference Series; vol. 274, no. 1 Time resolved imaging spectroscopy were used to study the spatial and temporal evolution of LIBS (Laser Induced Breakdown Spectroscopy) plasmas generated in Cu substrates by laser pulses of different duration. Long laser pulses (microsecond) and short laser pulses (nanosecond) as well as multipulse emission were used for excitation. Analysis was made by using an imaging spectrometer with time resolved detection. Results show that the use of long laser excitation pulses produce emission spectra with the same signal to noise ratio, but with lower resolution than those produced with shorter ones. The different species generated in LIBS experiments as neutral or single ionized have a different spatial distribution inside the plasma. We demonstrated that using spatial discrimination procedures is possible to obtain spectra with the same signal to noise ratio than those obtained with a gating detector. In this case an appreciable advantage in cost reduction is obtained by replacing the gating detector by a cheap screen.

Natural and laser-induced cavitation in corn stems: On the mechanisms of acoustic emissions

Thu, 10 May 2012 00:00:00 GMT

Articulo Papers in Physics; vol. 4 Water in plant xylem is often superheated, and therefore in a meta-stable state. Under certain conditions, it may suddenly turn from the liquid to the vapor state. This cavitation process produces acoustic emissions. We report the measurement of ultrasonic acoustic emissions (UAE) produced by natural and induced cavitation in corn stems. We induced cavitation and UAE in vivo, in well controlled and reproducible experiments, by irradiating the bare stem of the plants with a continuous-wave laser beam. By tracing the source of UAE, we were able to detect absorption and frequency filtering of the UAE propagating through the stem. This technique allows the unique possibility of studying localized embolism of plant conduits, and thus to test hypotheses on the hydraulic architecture of plants. Based on our results, we postulate that the source of UAE is a transient "cavity oscillation"' triggered by the disruptive effect of cavitation inception.

Enhancement of photoacoustic detection of inhomogeneities in polymers

Fri, 05 Jul 2013 00:00:00 GMT

Articulo Papers in Physics; vol. 5 We report a series of experiments on laser pulsed photoacoustic excitationin turbid polymer samples addressed to evaluate the sound speed in the samples and the presence of inhomogeneities in the bulk. We describe a system which allows the direct measurement of the speed of the detected waves by engraving the surface of the piece under study with a fiduciary pattern of black lines..We also describe how this pattern helps to enhance the sensitivity for the detection of an inhomogeneity in the bulk. These two facts are useful for studies in soft matter systems including, perhaps, biological samples. We have performed an experimental analysis on Grilon® samples in different situations and we show the limitations of the method.

Solvent effects on the photophysical properties of Bu₄N[(4,40-bpy) Re(CO)₃(bpy-5,50-diCOO)] complex: A combined experimental and computational study

Mon, 01 Aug 2016 00:00:00 GMT

Articulo Journal of Organometallic Chemistry; vol. 817 The photophysical properties of the complex Bu₄N[(4,4′-bpy)Re(CO)₃(bpy-5,5′-diCOO)] were studied in protic and aprotic media with the aid of steady-state and time-resolved techniques and TD-DFT calculations. The absorption spectrum as well as the steady state and time resolved luminescence of the Re(I) complex display a marked solvent effect. The highest and lowest energy absorption bands experience a bathochromic shift as the polarity of the solvent decreases. In addition, the lowest energy band broadens. Two luminescence bands were observed around 430 and 600 nm in protic organic solvents like alcohols. The high energy emission is observed solely in aqueous solutions, while in aprotic solvents only the low energy luminescence is detected. TD-DFT calculations allowed us to identify the main electronic transitions in the low energy region as ¹MLLCT Re(CO)₃ → 4,4′-bpy and ¹MLLCT Re(CO)₃ → bpy-5,5′-diCOO. The simulated absorption spectra of the Re(I) complex in H2O, protic (EtOH, MeOH) and aprotic (CHCl₃, CH₂Cl₂, CH₃CN) organic solvents follow the experimental absorption spectra with reasonable accuracy both in position and relative intensities. The magnitude of the calculated dipole moment (μ) increases with the dielectric constant of the solvent (εr). Besides, the energy of ¹MLLCT Re(CO)₃ → 4,4′-bpy also increases with εr. However, the energy of the ¹MLLCT Re(CO)₃ → bpy-5,5′-diCOO transition is rather insensitive to εr. This disparity is attributed to the fact that the ¹MLLCT Re(CO)₃ → 4,4′-bpy transition is nearly parallel to the orientation of μ while the ¹MLLCT Re(CO)₃ → bpy-5,5′-diCOO transition is almost perpendicular to it. Unrestricted TD-DFT calculations were successfully applied to the triplet species. It is observed that in the triplet state the Re–N distances are shortened while Re–C distances are elongated relative to the ground state. The calculated emission energy by TD-DFT and/or Δ(SCF) methods was compared to the experimental emission maximum in chloroform. All the experimental results as well as the theoretical calculations indicate that solvent effects on the steady state and time resolved luminescence of the Re(I) complex can be accounted by the coexistence of ³MLLCT Re(CO)₃ → 4,4′-bpy, ³MLLCT Re(CO)₃ → bpy-5,5′-diCOO and ¹IL excited states.

Virtual museums: Captured reality and 3D modeling

Tue, 01 Sep 2020 00:00:00 GMT

Articulo Journal of Cultural Heritage; vol. 45 Virtual spaces for the dissemination of cultural heritage and virtual experimentation were developed combining 3D image acquisition techniques like digital photogrammetry (captured reality) and computer 3D modeling. This is a novelty in peripheral countries, particularly in Latin-America, since there is almost no development of this kind of virtual museums in the region. Two virtual scenes are presented in the frame of a digitization project of the collections of Argentine museums. On one hand, a virtual museum named Virtual Collections was created. It exhibits, in a computer generated environment, the collections of the participating museums in the aforementioned project, digitized by 3D photogrammetry. On the other hand, a virtual tour that recreates a retrospective exhibition was also built as an interactive recording for documentation of the event. In both cases 3D modeling and texturing techniques were used, achieving realistic results. Two instances of immersion are available for the visualization and interaction with both virtual environments: screen, keyboard and mouse (Desktop VR) and HTC Vive (VR visualization headset).

Determination of femtosecond ablation thresholds by using laser ablation induced photoacoustics (LAIP)

Tue, 01 Jan 2013 00:00:00 GMT

Articulo Applied Physics A; vol. 110, no. 3 Femtosecond laser material processing as micromachining and nanoparticles fabrication require a careful control of the fluences deposited on the samples. In many cases, best results are obtained by using fluences slightly above the Laser Ablation Threshold (LAT), therefore its accurate determination is an important requirement. LAT can be obtained by measuring the intensity of the acoustic signal generated during the ablation process as a function of the laser fluence. In this work femtosecond laser ablation thresholds of commercially polished stainless steel plates, white high impact polystyrene, frosted glass, antique rag papers and silicon oxynitride thin films were determined by using laser ablation induced photoacoustics (LAIP). Results were compared with similar data previously obtained by using a nanosecond Nd:YAG laser.

High efficiencies for laser cleaning of glassware irradiated from the back: application to glassware historical objects

Mon, 01 Jan 2018 00:00:00 GMT

Articulo Applied Physics A; vol. 124, no. 4 We present a systematic study of laser cleaning of black paint deposited on both standard and frosted glasses. We performed laser cleaning of black paint layers of different thicknesses in both front- and backside laser irradiation geometries. Using laser ablation induced photoacoustics (LAIP), we determined the ablation threshold of the paint that turns out to be independent of the paint thickness and substrate’s properties. To characterize the efficiency of the cleaning process as a function of the number of laser shots, we measured the transmission of the glass in the ablated region and simultaneously the amplitude of the acoustic signal generated by the ablation process. We show that laser cleaning is much more effective when the glass sample is irradiated from the back. To explain this effect, we propose a phenomenological model. This model also predicts the existence of a critical thickness, above which backside cleaning is no longer efficient. The method of back incidence laser cleaning was successfully applied to two real objects, namely a piece of advertising glass covered with black paint and an antique glass bottle with black dirt inside, both archeological objects founded in excavations made in the city of Buenos Aires.

Characterization of reference standards for dirt by Laser Ablation Induced Photoacoustics (LAIP)

Fri, 01 Jan 2010 00:00:00 GMT

Articulo 15th International Conference on Photoacoustic and Photothermal Phenomena (ICPPP15) (Leuven, Belgium, 19-23 July 2009); Journal of Physics: Conference Series; vol. 214 Measurements of surface cleanliness and dirt characterization are important problems in a wide range of processes in industry and production. Standard methods are in most cases cumbersome laboratory procedures that must be performed out of the production lines. Instruments and methods for cleanliness determination and dirt characterization require reference standards for calibration. For that purpose we built a possible dirt reference standard (DRS) made by films of graphite grease subjected to heat treatment for mechanical stabilization. The DRS characterization was performed by Laser Ablation Induced Photoacoustics (LAIP). The measurement of the thickness of the films was made by lowcoherence interferometry.

Laser-Induced Breakdown Spectroscopy (LIBS) Quality Control and Origin Identification of Handmade Manufactured Cigars

Thu, 01 Jan 2015 00:00:00 GMT

Comunicacion Applied Spectroscopy; vol. 69, no. 10 Tobacco is an agricultural product originating in America that is obtained by processing the leaves of various plants of the genus Nicotiana tabacum. It is the inedible product occupying the most plantings in the world, according to a recent report from the United Nations Food and Agriculture Organization. It is consumed in various ways, but the most popular form of consumption is, undoubtedly, by smoking cigarettes. A particular segment of the tobacco industry is the manufacturing of handmade cigars, which for some third-world countries is an important source of income. There are different qualities of cigars, and a major problem is the adulteration that occurs, for example, when authentic high-quality leaves are replaced by lower quality leaves. A factor that influences the quality of the cigars is the smoke combustion process, which depends on several factors, particularly the composition of the leaves. We present a simple and quick technique for the quality control and origin identification of handmade cigars that measures the Mg/Ca ratios in the tobacco leaves and wrappers of the cigars using laser-induced breakdown spectroscopy.

Registro en 3 dimensiones de bienes culturales: Aplicaciones al arte contemporáneo

Sun, 01 Jan 2017 00:00:00 GMT

Tesis de doctorado Bilmes, Gabriel Mario; Andruchow, Marcela Doctor en Artes; Universidad Nacional de La Plata En los últimos años la preservación y puesta en valor del Patrimonio Cultural ha crecido en la escala de prioridades de nuestra sociedad. Hay una creciente necesidad de digitalizar los bienes culturales utilizando nuevas tecnologías. La adquisición de imágenes en 3D es una de ellas. Sin embargo, si bien las técnicas de registro 3D están ampliamente difundidas a nivel mundial, casi no tienen antecedentes de desarrollo y/o aplicación en la Argentina. Por otra parte, la conservación y documentación del arte contemporáneo presenta nuevas problemáticas particulares respecto al arte tradicional, particularmente en arte de instalación y arte efímero. Esta tesis explora las posibilidades y limitaciones que tienen las nuevas tecnologías de registro 3D, realidad virtual y realidad aumentada, en arte tradicional y contemporáneo, particularmente en la conservación y documentación de colecciones de museos. Se presenta un sistema de registro de imágenes 3D de acceso gratuito desarrollado utilizando fotogrametría digital, instrumental de bajo costo y software libre.

A real time method for surface cleanliness measurement

Sun, 01 Jan 2006 00:00:00 GMT

Articulo Applied Physics B: Lasers and Optics; vol. 82 The measurement of surface cleanliness is a signifi cant problem in many industrial and technological processes. Existing methods are based on laboratory procedures, that are not performed in real time, can not be automated, and usually are restricted to a small portion of the sample. In this study we describe a new method for real time measurement of the amount of surface dirt or contamination deposited on a surface. It relies on the ablation of the surface dirt film by means of a short laser pulse, and the subsequent measurement of the emitted sound. The intensity of the sound is proportional to the amount of surface dirt and provides a direct measurement of the cleanli ness of the surface. We also developed a reference sample for calibration, based on a uniform distribution of dots printed on white paper. The density and the dot size can be easily modified providing a homogeneous, uniform and reproducible standard for the measurement. Based on this method, we designed, de veloped and patented the first industrial instrument for on line determination of the degree of cleanliness of manufactured cold rolled steel plate bobbins.

Cleaning and characterization of objects of cultural value by laser ablation

Sat, 01 Jan 2005 00:00:00 GMT

Objeto de conferencia SPIE, Bellingham, WA, 2005 Surface ablation with nanosecond laser pulses was applied to preservation, cleaning and compositional identification of objects of cultural value. 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. Damage fluence thresholds for 17 different XIXth century types of papers, made by processing textiles, were determined. 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. In particular, we show applications to the identification of trace elements in Hominide teeth, of interest concerning the analysis of eating habits. We also apply LIBS to the determination of the composition of acheological objects belonging to different pre Columbian cultures. Publicado en "Optical Methods for Arts and Archaeology". Proceedings of SPIE volume 5857, editado por Renzo Salimbeni y Luca Pezzati.