This page has only limited features, please log in for full access.
Measurement of the elemental composition of shells is increasingly emerging as an avenue for obtaining high-resolution insights into paleoclimate and past seasonality. Several studies have shown significant correlations between Mg/Ca ratios measured on shell carbonate and the sea surface temperature (SST) within which this carbonate was precipitated. However, other investigations have reported large variability in this relationship between species. Therefore, further studies, including taxa previously not considered are still required in order to validate these new species as suitable climate proxies. Here, we measured Mg/Ca ratios for limpet Patella depressa Pennant, 1777 samples live-collected in northern Spain for the first time. The elemental ratio was measured using laser-induced breakdown spectroscopy (LIBS), a technique that significantly decreases the time required for sample preparation and increases the number of shells that can be analyzed. In this study, calibration-free LIBS (CF-LIBS) methods were applied to estimate molar concentrations of chemical elements on biogenic calcium carbonate. The Mg/Ca ratio evolution along the shell growth axis was compared with stable oxygen isotope (δ18O) profiles obtained from these same limpets and the SST at the place where the mollusk grew to determine if the sequences obtained correctly reflected environmental conditions during the life-span of the mollusk. The results showed a significant correlation between Mg/Ca ratio series and both δ18O profiles and SST, highlighting the paleoenvironmental and archaeological potential of LIBS analyses on this mollusk species that is frequently found in archaeological contexts in the western Europe.
Asier García-Escárzaga; Marina Martínez-Minchero; Adolfo Cobo; Igor Gutiérrez-Zugasti; Alvaro Arrizabalaga; Patrick Roberts. Using Mg/Ca Ratios from the Limpet Patella depressa Pennant, 1777 Measured by Laser-Induced Breakdown Spectroscopy (LIBS) to Reconstruct Paleoclimate. Applied Sciences 2021, 11, 2959 .
AMA StyleAsier García-Escárzaga, Marina Martínez-Minchero, Adolfo Cobo, Igor Gutiérrez-Zugasti, Alvaro Arrizabalaga, Patrick Roberts. Using Mg/Ca Ratios from the Limpet Patella depressa Pennant, 1777 Measured by Laser-Induced Breakdown Spectroscopy (LIBS) to Reconstruct Paleoclimate. Applied Sciences. 2021; 11 (7):2959.
Chicago/Turabian StyleAsier García-Escárzaga; Marina Martínez-Minchero; Adolfo Cobo; Igor Gutiérrez-Zugasti; Alvaro Arrizabalaga; Patrick Roberts. 2021. "Using Mg/Ca Ratios from the Limpet Patella depressa Pennant, 1777 Measured by Laser-Induced Breakdown Spectroscopy (LIBS) to Reconstruct Paleoclimate." Applied Sciences 11, no. 7: 2959.
The relationship between 3D terrain complexity and fine-scale localization and distribution of species is poorly understood. Here we present a very fine-scale 3D reconstruction model of three zones of circalittoral rocky shelf in the Bay of Biscay. Detailed terrain variables are extracted from 3D models using a structure-from-motion (SfM) approach applied to ROTV images. Significant terrain variables that explain species location were selected using general additive models (GAMs) and micro-distribution of the species were predicted. Two models combining BPI, curvature and rugosity can explain 55% and 77% of the Ophiuroidea and Crinoidea distribution, respectively. The third model contributes to explaining the terrain variables that induce the localization of Dendrophyllia cornigera. GAM univariate models detect the terrain variables for each structural species in this third zone (Artemisina transiens, D. cornigera and Phakellia ventilabrum). To avoid the time-consuming task of manual annotation of presence, a deep-learning algorithm (YOLO v4) is proposed. This approach achieves very high reliability and low uncertainty in automatic object detection, identification and location. These new advances applied to underwater imagery (SfM and deep-learning) can resolve the very-high resolution information needed for predictive microhabitat modeling in a very complex zone.
Elena Prado; Augusto Rodríguez-Basalo; Adolfo Cobo; Pilar Ríos; Francisco Sánchez. 3D Fine-scale Terrain Variables from Underwater Photogrammetry: A New Approach to Benthic Microhabitat Modeling in a Circalittoral Rocky Shelf. Remote Sensing 2020, 12, 2466 .
AMA StyleElena Prado, Augusto Rodríguez-Basalo, Adolfo Cobo, Pilar Ríos, Francisco Sánchez. 3D Fine-scale Terrain Variables from Underwater Photogrammetry: A New Approach to Benthic Microhabitat Modeling in a Circalittoral Rocky Shelf. Remote Sensing. 2020; 12 (15):2466.
Chicago/Turabian StyleElena Prado; Augusto Rodríguez-Basalo; Adolfo Cobo; Pilar Ríos; Francisco Sánchez. 2020. "3D Fine-scale Terrain Variables from Underwater Photogrammetry: A New Approach to Benthic Microhabitat Modeling in a Circalittoral Rocky Shelf." Remote Sensing 12, no. 15: 2466.
Combined shell growth pattern and oxygen isotope analysis has become a powerful approach in palaeoclimate and archaeological studies for reconstructing palaeoclimate conditions and littoral exploitation patterns, respectively. Recent investigations have shown that the gastropod Phorcus lineatus (da Costa, 1778) forms its shell in conditions of near equilibrium with the oxygen isotope signature of the seawater environment, demonstrating the utility of this species for reconstruction of sea surface temperature and determination of the season of harvest in archaeological studies. In contrast, the shell growth patterns of this species have received virtually no attention despite providing information on the rate and timing of shell growth that is crucial for correctly interpreting environmental proxies derived from shell geochemistry. In this paper, we compare microgrowth patterns and isotopic profiles of four modern individuals of the gastropod P. lineatus from northern Iberia to determine the timing and periodicity of subannual growth markers within the shells. Results of this sclerochronological study showed the presence of two types of growth lines/increments: i) large-scale accretionary units formed with variable periodicity, and ii) small-scale accretionary units formed by micro growth lines and increments determined by semidiurnal tidal cycles. Results suggest that shells grew uninterruptedly during early ontogeny. However, older specimens exhibited growth cessation/slowdown during summer and winter/spring. Therefore, shell growth rate is not only controlled by environmental conditions, but also by ontogenetic age and/or endogenous rhythms. A high correlation was found between seawater temperature derived from shell oxygen isotopes and instrumental seawater temperature (r2 = 0.88–0.98; p-values < 0.0001). This study shows that establishing accurate growth patterns of the topshell P. lineatus is essential for correctly reconstructing past seawater temperature conditions in palaeoclimate studies and for determining with higher precision the season(s) when the subfossil shells were collected by humans.
Asier García-Escárzaga; Igor Gutiérrez-Zugasti; Bernd R. Schöne; Adolfo Cobo; Javier Martín-Chivelet; Manuel R. González-Morales. Growth patterns of the topshell Phorcus lineatus (da Costa, 1778) in northern Iberia deduced from shell sclerochronology. Chemical Geology 2019, 526, 49 -61.
AMA StyleAsier García-Escárzaga, Igor Gutiérrez-Zugasti, Bernd R. Schöne, Adolfo Cobo, Javier Martín-Chivelet, Manuel R. González-Morales. Growth patterns of the topshell Phorcus lineatus (da Costa, 1778) in northern Iberia deduced from shell sclerochronology. Chemical Geology. 2019; 526 ():49-61.
Chicago/Turabian StyleAsier García-Escárzaga; Igor Gutiérrez-Zugasti; Bernd R. Schöne; Adolfo Cobo; Javier Martín-Chivelet; Manuel R. González-Morales. 2019. "Growth patterns of the topshell Phorcus lineatus (da Costa, 1778) in northern Iberia deduced from shell sclerochronology." Chemical Geology 526, no. : 49-61.
The presence of gorgonian forests and deep-sea sponge aggregations in the Le Danois Bank promoted its declaration as the "El Cachucho” Marine Protected Area (MPA) by the Spanish Ministry of Environment, and its inclusion in the Natura 2000 network. Both habitats are considered vulnerable, so follow-up surveys are being performed to monitor their conservation in compliance with the EU Habitats Directive. The use of a non-invasive methodology, which does not cause damage or alterations on benthic communities, is particularly necessary in vulnerable ecosystem studies and MPA monitoring. This study analyzed the assemblage structure of a Placogorgia sp. population using a 3D photogrammetry-based method. The study was carried out through the analysis of the video transects obtained at the Le Danois Bank, using the Politolana underwater towed vehicle during the July 2017 ECOMARG survey. Recent developments in specific software of photogrammetric image analysis allowed extracting valuable information from these video transects. Using the Pix4D Mapper Pro software, 3D point clouds were obtained, and the size and morphometry of yellow fan-shaped gorgonian population structure could be evaluated. Due to gorgonian’s high structural complexity, the use of length (i.e. height) as the morphometric descriptor of the real size of the colonies is not appropriate. Instead of length, the fan surface area covered by each gorgonian colony was selected as a suitable parameter of size. The direct measurement of this parameter was possible through a complete 3D reconstruction of the gorgonian forest. A total of 426 colonies of Placogorgia sp. were digitalized to obtain surface measurements and fan spread orientation calculations in 3D models. The results show that gorgonian populations were mostly composed of a high proportion of small colonies (0-0.10 m2). The population structure distribution shows a high proportion (∼27%) of recruits (0.5 m2). In 78% of the gorgonian colonies, facing angles were grouped inside the first quadrant (0º-90º), in accordance with the main current direction in this zone. Colony distribution and fan orientation inside the gorgonian forest can be used as data sources to improve monitoring and management programs of these unique habitats in MPAs.
Elena Prado; Francisco Sánchez; Augusto Rodríguez; Álvaro Altuna; Adolfo Cobo. Analysis of the population structure of a gorgonian forest (Placogorgia sp.) using a photogrammetric 3D modeling approach at Le Danois Bank, Cantabrian Sea. Deep Sea Research Part I: Oceanographic Research Papers 2019, 153, 103124 .
AMA StyleElena Prado, Francisco Sánchez, Augusto Rodríguez, Álvaro Altuna, Adolfo Cobo. Analysis of the population structure of a gorgonian forest (Placogorgia sp.) using a photogrammetric 3D modeling approach at Le Danois Bank, Cantabrian Sea. Deep Sea Research Part I: Oceanographic Research Papers. 2019; 153 ():103124.
Chicago/Turabian StyleElena Prado; Francisco Sánchez; Augusto Rodríguez; Álvaro Altuna; Adolfo Cobo. 2019. "Analysis of the population structure of a gorgonian forest (Placogorgia sp.) using a photogrammetric 3D modeling approach at Le Danois Bank, Cantabrian Sea." Deep Sea Research Part I: Oceanographic Research Papers 153, no. : 103124.
The Mesolithic period in the Cantabrian region, a coastal area located in northern Spain, is characterised by a marked increase in the human use of coastal resources in comparison with previous periods, resulting in the formation of so-called “shell middens”. Archaeological investigations have provided insights into the formation processes of these shell middens, as well as long-term changes in human exploitation of different marine resources and the relationship of foraging strategies to past climate changes. However, efforts to reconstruct the key environmental factor governing coastal subsistence and foraging resilience, the seasonal availability and use of different marine resources, have been limited in the region and, indeed, across coastal Mesolithic Europe more widely. Here, we use stable oxygen isotope analysis of Phorcus lineatus (da Costa, 1778), one of the most widespread molluscs in northern Iberian mesolithic coastal sites, in order to determine the season in which humans collected key coastal resources at the site of EL Mazo (Llanes, Asturias). We demonstrate that P. lineatus was exclusively collected in late autumn, winter and early spring. An experimental programme, in which modern P. lineatus specimens were collected in situ over the course of three years, established that relative meat yield varied within this species throughout the annual cycle, with higher relative meat yield during colder months. We argue that mollusc collection patterns were driven by a cost-benefit principle during the Mesolithic in the Cantabrian region and human populations had intimate knowledge of the seasonal developmental cycles of exploited marine taxa. This also highlights the importance of developing intra-annual records of resource use and climate change if coastal foraging is to be properly understood in prehistory.
Asier García-Escárzaga; Igor Gutiérrez-Zugasti; Adolfo Cobo; David Cuenca-Solana; Javier Martín-Chivelet; Patrick Roberts; Manuel R. González-Morales. Stable oxygen isotope analysis of Phorcus lineatus (da Costa, 1778) as a proxy for foraging seasonality during the Mesolithic in northern Iberia. Archaeological and Anthropological Sciences 2019, 11, 5631 -5644.
AMA StyleAsier García-Escárzaga, Igor Gutiérrez-Zugasti, Adolfo Cobo, David Cuenca-Solana, Javier Martín-Chivelet, Patrick Roberts, Manuel R. González-Morales. Stable oxygen isotope analysis of Phorcus lineatus (da Costa, 1778) as a proxy for foraging seasonality during the Mesolithic in northern Iberia. Archaeological and Anthropological Sciences. 2019; 11 (10):5631-5644.
Chicago/Turabian StyleAsier García-Escárzaga; Igor Gutiérrez-Zugasti; Adolfo Cobo; David Cuenca-Solana; Javier Martín-Chivelet; Patrick Roberts; Manuel R. González-Morales. 2019. "Stable oxygen isotope analysis of Phorcus lineatus (da Costa, 1778) as a proxy for foraging seasonality during the Mesolithic in northern Iberia." Archaeological and Anthropological Sciences 11, no. 10: 5631-5644.
3D reconstruction and virtual reality (VR) technology provide many opportunities for the documentation and dissemination of underwater cultural heritage. Advances in the development of underwater exploration technology have allowed for the first time to accurately reconstruct a complete 3D model of the cargo Río Miera in the Cantabrian Sea. Sunk on December 6, 1951 after a strong collision, the cargo ship Río Miera rests on a sandy bottom about 40 meters deep, very close to the Cantabrian coast. Located in an area of strong currents is a classic objective of the region for the most experienced divers. The survey was carried out this summer in R/V Ramón Margalef of the IEO, acquiring acoustic data with multibeam echo sounders and hundreds of images acquired by a remotely piloted underwater vehicle. The campaign is part of the PhotoMARE project - Underwater Photogrammetry for MArine Renewable Energy. This work describes the workflow regarding the survey, images and acoustic data acquisition, data processing, optic 3D point cloud color enhancement and acoustic and optic dataset merging procedure to obtain a complete 3D model of wreck Río Miera in Cantabrian Sea. Through this project, Spanish Institute of Oceanography – IEO have advanced – combining acoustic and image methods - in the generation of 3D models of archaeological sites and submerged structures.
E. Prado; M. Gómez-Ballesteros; A. Cobo; F. Sánchez; A. Rodriguez-Basalo; B. Arrese; L. Rodríguez-Cobo. 3D MODELING OF RIO MIERA WRECK SHIP MERGING OPTICAL AND MULTIBEAM HIGH RESOLUTION POINTS CLOUD. The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences 2019, XLII-2/W10, 159 -165.
AMA StyleE. Prado, M. Gómez-Ballesteros, A. Cobo, F. Sánchez, A. Rodriguez-Basalo, B. Arrese, L. Rodríguez-Cobo. 3D MODELING OF RIO MIERA WRECK SHIP MERGING OPTICAL AND MULTIBEAM HIGH RESOLUTION POINTS CLOUD. The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. 2019; XLII-2/W10 ():159-165.
Chicago/Turabian StyleE. Prado; M. Gómez-Ballesteros; A. Cobo; F. Sánchez; A. Rodriguez-Basalo; B. Arrese; L. Rodríguez-Cobo. 2019. "3D MODELING OF RIO MIERA WRECK SHIP MERGING OPTICAL AND MULTIBEAM HIGH RESOLUTION POINTS CLOUD." The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-2/W10, no. : 159-165.
This study presents a semi-automatic method to estimate fan surface of a Placogorgia sp. octocoral assemblage using 3D point clouds in El Cachucho MPA at 550 m of depth. The presence of gorgonian forests and deep-sea sponge aggregations in Le Danois Bank was the cause of its declaration as ‘El Cachucho’ Marine Protected Area (MPA), being included in the Natura 2000 network. The Placogorgia sp. is a structuring species of the deep Cantabrian Sea; parameters such as population structure and morphology inform on the overall health of this vulnerable habitat, but the estimation of gorgonian metrics often requires destructive sampling. The use of non-invasive methodology, which does not cause damage or alterations on benthic communities, is particularly necessary in vulnerable ecosystem studies and Marine Protected Areas (MPA) monitoring. This study proposes a semi-automatic methodology to assess gorgonian morphometries fitting planes to colonies. Video transects acquired in Le Danois Bank, during the ECOMARG-2017 survey using the Politolana underwater towed vehicle were used. Using Pix4D Mapper Pro and Cloud Compare software, size and morphometry of fan-shaped gorgonians and forest population structure were assessed. RMS of fitting planes shows that the geometrical figure chosen is suitable to retain the morphometric characteristics of the specimens of this species. The adjustment of semi-automatic values with a sample of digitized surfaces manually is validated (R2=0.97). The results show that gorgonian population was mostly dominated by small colonies. The population structure distribution shows a high proportion (~22%) of recruits (< 0.05 m2) of fan surface.
E. Prado; F. Sánchez; A. Rodríguez-Basalo; A. Altuna; A. Cobo. SEMI-AUTOMATIC METHOD OF FAN SURFACE ASSESSMENT TO ACHIEVE GORGONIAN POPULATION STRUCTURE IN LE DANOIS BANK, CANTABRIAN SEA. The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences 2019, XLII-2/W10, 167 -173.
AMA StyleE. Prado, F. Sánchez, A. Rodríguez-Basalo, A. Altuna, A. Cobo. SEMI-AUTOMATIC METHOD OF FAN SURFACE ASSESSMENT TO ACHIEVE GORGONIAN POPULATION STRUCTURE IN LE DANOIS BANK, CANTABRIAN SEA. The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. 2019; XLII-2/W10 ():167-173.
Chicago/Turabian StyleE. Prado; F. Sánchez; A. Rodríguez-Basalo; A. Altuna; A. Cobo. 2019. "SEMI-AUTOMATIC METHOD OF FAN SURFACE ASSESSMENT TO ACHIEVE GORGONIAN POPULATION STRUCTURE IN LE DANOIS BANK, CANTABRIAN SEA." The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-2/W10, no. : 167-173.
Biogenic carbonate mollusc shells have the unique property of being a durable material found in many archaeological and geological sites, recording in their shell chemical composition the ambient environmental conditions during the mollusc's lifespan. In particular, mollusc shell Mg/Ca ratios have been suggested to be related to seawater temperature, although such a relationship is controversial and appears to be species- and even location-specific. This study investigates the use of Laser-Induced Breakdown Spectroscopy (LIBS) for the rapid measurement of Mg/Ca profiles within Patella vulgata shells, via comparison with one established analytical technique that is most often used for this purpose, ICP-OES. LIBS offers some advantages over other spectrometric techniques, including ICP-OES, the latter requiring initial micromilling of sample powders. LIBS offers faster measurement, reduced sample preparation, easier automation and less complex and lower cost instrumentation. A high correlation is evident between LIBS and ICP-OES Mg/Ca profiles within four archaeological P. vulgata shells, as well as strong similarities between LIBS measurements made in two different areas of each P. vulgata shell (i.e. the apex and a more conventional transect along the axis of shell growth). Validation of the LIBS technique for determination of Mg/Ca profiles within P. vulgata shells has implications for archaeological studies, because a greater number of shell specimens sampled from each archaeological site and chronological level can be measured, thereby improving the statistical robustness of data interpretation and conclusions. One example archaeological application that would benefit from application of the LIBS technique is identification of the season-of-capture of marine molluscs as a food resource for prehistoric societies.
Asier García-Escárzaga; Leon J. Clarke; Igor Gutiérrez-Zugasti; Manuel R. González-Morales; Marina Martínez-Minchero; Jose Miguel Lopez-Higuera; Adolfo Cobo. Mg/Ca profiles within archaeological mollusc (Patella vulgata) shells: Laser-Induced Breakdown Spectroscopy compared to Inductively Coupled Plasma-Optical Emission Spectrometry. Spectrochimica Acta Part B: Atomic Spectroscopy 2018, 148, 8 -15.
AMA StyleAsier García-Escárzaga, Leon J. Clarke, Igor Gutiérrez-Zugasti, Manuel R. González-Morales, Marina Martínez-Minchero, Jose Miguel Lopez-Higuera, Adolfo Cobo. Mg/Ca profiles within archaeological mollusc (Patella vulgata) shells: Laser-Induced Breakdown Spectroscopy compared to Inductively Coupled Plasma-Optical Emission Spectrometry. Spectrochimica Acta Part B: Atomic Spectroscopy. 2018; 148 ():8-15.
Chicago/Turabian StyleAsier García-Escárzaga; Leon J. Clarke; Igor Gutiérrez-Zugasti; Manuel R. González-Morales; Marina Martínez-Minchero; Jose Miguel Lopez-Higuera; Adolfo Cobo. 2018. "Mg/Ca profiles within archaeological mollusc (Patella vulgata) shells: Laser-Induced Breakdown Spectroscopy compared to Inductively Coupled Plasma-Optical Emission Spectrometry." Spectrochimica Acta Part B: Atomic Spectroscopy 148, no. : 8-15.
Asier García-Escárzaga; Igor Gutiérrez-Zugasti; Manuel González-Morales; Adolfo Cobo-García. Shells and Humans: Molluscs and Other Coastal Resources from the Earliest Human Occupations at the Mesolithic Shell Midden of El Mazo (Asturias, Northern Spain). Volume 30 2017, 27, 1 .
AMA StyleAsier García-Escárzaga, Igor Gutiérrez-Zugasti, Manuel González-Morales, Adolfo Cobo-García. Shells and Humans: Molluscs and Other Coastal Resources from the Earliest Human Occupations at the Mesolithic Shell Midden of El Mazo (Asturias, Northern Spain). Volume 30. 2017; 27 (1):1.
Chicago/Turabian StyleAsier García-Escárzaga; Igor Gutiérrez-Zugasti; Manuel González-Morales; Adolfo Cobo-García. 2017. "Shells and Humans: Molluscs and Other Coastal Resources from the Earliest Human Occupations at the Mesolithic Shell Midden of El Mazo (Asturias, Northern Spain)." Volume 30 27, no. 1: 1.
The chemical composition of mollusk shells offers information about environmental conditions present during the lifespan of the organism. Shells found in geological deposits and in many archeological sites can help to reconstruct past climatic conditions. For example, a correlation has been found between seawater temperature and the amount of some substituent elements (e.g., magnesium, strontium) in the biogenerated calcium carbonate matrix of the shell, although it is very species-specific. Here we propose the use laser-induced breakdown spectroscopy (LIBS) to estimate Mg/Ca ratios in modern specimens of the common limpet Patella vulgata. An automated setup was used to obtain a sequence of Mg/Ca ratios across a sampling path that could be compared with the seawater temperatures recorded during the organism’s lifespan. Results using four shells collected in different months of the year showed a direct relationship between the Mg/Ca ratios and the seawater temperature, although the sequences also revealed small-scale (short-term) variability and an irregular growth rate. Nevertheless, it was possible to infer the season of capture and the minimum and maximum seawater temperatures from the LIBS sequences. This fact, along with the reduction in sampling and measurement time compared with other spectrometric techniques (such as inductively coupled plasma mass spectrometry [ICP-MS]), makes LIBS useful in paleoclimatic studies.
Adolfo Cobo; Asier García-Escárzaga; Igor Gutiérrez-Zugasti; Jesús Setién; Manuel R. González-Morales; Jose Miguel Lopez-Higuera. Automated Measurement of Magnesium/Calcium Ratios in Gastropod Shells Using Laser-Induced Breakdown Spectroscopy for Paleoclimatic Applications. Applied Spectroscopy 2017, 71, 591 -599.
AMA StyleAdolfo Cobo, Asier García-Escárzaga, Igor Gutiérrez-Zugasti, Jesús Setién, Manuel R. González-Morales, Jose Miguel Lopez-Higuera. Automated Measurement of Magnesium/Calcium Ratios in Gastropod Shells Using Laser-Induced Breakdown Spectroscopy for Paleoclimatic Applications. Applied Spectroscopy. 2017; 71 (4):591-599.
Chicago/Turabian StyleAdolfo Cobo; Asier García-Escárzaga; Igor Gutiérrez-Zugasti; Jesús Setién; Manuel R. González-Morales; Jose Miguel Lopez-Higuera. 2017. "Automated Measurement of Magnesium/Calcium Ratios in Gastropod Shells Using Laser-Induced Breakdown Spectroscopy for Paleoclimatic Applications." Applied Spectroscopy 71, no. 4: 591-599.
A. Boukhachem; M. Mokhtari; N. Benameur; Aicha Ziouche; Marina Martínez-Minchero; P. Petkova; M. Ghamnia; Adolfo Cobo; M. Zergoug; Mosbah Amlouk. Structural optical magnetic properties of Co doped α-MoO 3 sprayed thin films. Sensors and Actuators A: Physical 2017, 253, 198 -209.
AMA StyleA. Boukhachem, M. Mokhtari, N. Benameur, Aicha Ziouche, Marina Martínez-Minchero, P. Petkova, M. Ghamnia, Adolfo Cobo, M. Zergoug, Mosbah Amlouk. Structural optical magnetic properties of Co doped α-MoO 3 sprayed thin films. Sensors and Actuators A: Physical. 2017; 253 ():198-209.
Chicago/Turabian StyleA. Boukhachem; M. Mokhtari; N. Benameur; Aicha Ziouche; Marina Martínez-Minchero; P. Petkova; M. Ghamnia; Adolfo Cobo; M. Zergoug; Mosbah Amlouk. 2017. "Structural optical magnetic properties of Co doped α-MoO 3 sprayed thin films." Sensors and Actuators A: Physical 253, no. : 198-209.
The identification and intensity estimation of some aluminium emission lines have been proposed to perform an on-line quantification of the Al contribution to the laser-welding process of Usibor blanks. This boron steel is protected by an Al-Si coating that is removed by laser ablation before welding. If this process fails to remove Al from the joint surface, its contribution may affect the final properties of the resulting seams, therefore compromising their quality. Experimental tests have been performed, some of them in a real production scenario. They have been analysed and compared to the results of welding test specimens, analysis of the associated tensile properties and fracture locations and seam macrographs. These studies have indicated that on-line quantification of the Al contribution to the process is feasible and that a correlation can be established between the Al content estimated in real-time and the results derived from the off-line tests considered.
J. Mirapeix; E. Vila; Jose Julian Valdiande; A. Riquelme; M. Garcia; Adolfo Cobo. Real-time detection of the aluminium contribution during laser welding of Usibor1500 tailor-welded blanks. Journal of Materials Processing Technology 2016, 235, 106 -113.
AMA StyleJ. Mirapeix, E. Vila, Jose Julian Valdiande, A. Riquelme, M. Garcia, Adolfo Cobo. Real-time detection of the aluminium contribution during laser welding of Usibor1500 tailor-welded blanks. Journal of Materials Processing Technology. 2016; 235 ():106-113.
Chicago/Turabian StyleJ. Mirapeix; E. Vila; Jose Julian Valdiande; A. Riquelme; M. Garcia; Adolfo Cobo. 2016. "Real-time detection of the aluminium contribution during laser welding of Usibor1500 tailor-welded blanks." Journal of Materials Processing Technology 235, no. : 106-113.
In this paper, a Fiber Specklegram Sensor (FSS) based on Plastic Optical Fiber (POF) has been proposed with a reflection-based configuration. A HeNe laser is launched through a coupler, reflected by a mirrored fiber end and detect the specklegram sequence using a commercial camera. Different sensor performance metrics have been analyzed in terms of final sensitivity to external vibration applied to the fiber. The results confirm the performance reduction of the reflection-based scheme in comparison with the transmission-based approach but it can be also employed as sensing system where only a single fiber end is available. © (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
L. Rodriguez-Cobo; M. Lomer; R. Ruiz-Lombera; Adolfo Cobo; J. M. López-Higuera. Reflection-based fiber specklegram sensor. Sixth European Workshop on Optical Fibre Sensors 2016, 9916, 99161 .
AMA StyleL. Rodriguez-Cobo, M. Lomer, R. Ruiz-Lombera, Adolfo Cobo, J. M. López-Higuera. Reflection-based fiber specklegram sensor. Sixth European Workshop on Optical Fibre Sensors. 2016; 9916 ():99161.
Chicago/Turabian StyleL. Rodriguez-Cobo; M. Lomer; R. Ruiz-Lombera; Adolfo Cobo; J. M. López-Higuera. 2016. "Reflection-based fiber specklegram sensor." Sixth European Workshop on Optical Fibre Sensors 9916, no. : 99161.
Luis Rodríguez-Cobo; Adolfo Cobo; José-Miguel López-Higuera. Embedded compaction pressure sensor based on Fiber Bragg Gratings. Measurement 2015, 68, 257 -261.
AMA StyleLuis Rodríguez-Cobo, Adolfo Cobo, José-Miguel López-Higuera. Embedded compaction pressure sensor based on Fiber Bragg Gratings. Measurement. 2015; 68 ():257-261.
Chicago/Turabian StyleLuis Rodríguez-Cobo; Adolfo Cobo; José-Miguel López-Higuera. 2015. "Embedded compaction pressure sensor based on Fiber Bragg Gratings." Measurement 68, no. : 257-261.
In this paper, an analysis on the suitability of employing a colorimetric analysis of the acquired plasma spectra to perform on-line arc-welding quality monitoring will be discussed. Different colorimetric parameters like the color temperature or the parameters associated with the hue, saturation, luminance color space will be evaluated in comparison with the standard approach based on the estimation of the plasma electronic temperature. This approach does not require the identification of the emission lines involved in the analysis, thus giving rise to a more efficient solution in terms of computational efficiency, and avoiding unambiguous identifications that may give rise to incorrect results. In particular, experimental tests performed with a tungsten inert gas arc-welding process will show the feasibility of using the proposed solution and its ability to perform an online detection of different welding perturbations.
Jesus Mirapeix Serrano; Ruben Ruiz Lombera; Jose J. Valdiande; Adolfo Cobo; Jose Miguel Lopez-Higuera; Mirapeix Serrano J.; Ruiz Lombera R.R.; Valdiande J.J.; Cobo A.. Colorimetric Analysis for On-Line Arc-Welding Diagnostics by Means of Plasma Optical Spectroscopy. IEEE Sensors Journal 2015, 16, 3465 -3471.
AMA StyleJesus Mirapeix Serrano, Ruben Ruiz Lombera, Jose J. Valdiande, Adolfo Cobo, Jose Miguel Lopez-Higuera, Mirapeix Serrano J., Ruiz Lombera R.R., Valdiande J.J., Cobo A.. Colorimetric Analysis for On-Line Arc-Welding Diagnostics by Means of Plasma Optical Spectroscopy. IEEE Sensors Journal. 2015; 16 (10):3465-3471.
Chicago/Turabian StyleJesus Mirapeix Serrano; Ruben Ruiz Lombera; Jose J. Valdiande; Adolfo Cobo; Jose Miguel Lopez-Higuera; Mirapeix Serrano J.; Ruiz Lombera R.R.; Valdiande J.J.; Cobo A.. 2015. "Colorimetric Analysis for On-Line Arc-Welding Diagnostics by Means of Plasma Optical Spectroscopy." IEEE Sensors Journal 16, no. 10: 3465-3471.
A Laser-induced Breakdown Spectroscopy setup for the measurement of the magnesium to calcium ratios along the growth lines of sea snails shells is presented. It allows an automatic measurement over the shell’s surface without sample preparation.
Adolfo Cobo; Asier García-Escárzaga; Luis Rodríguez-Cobo; Igor Gutiérrez-Zugasti; Manuel R. González-Morales; José-Miguel López-Higuera. Automated Laser-induced Breakdown Spectroscopy setup for chemical mapping of archaeological shells. Advanced Photonics 2015, 1 .
AMA StyleAdolfo Cobo, Asier García-Escárzaga, Luis Rodríguez-Cobo, Igor Gutiérrez-Zugasti, Manuel R. González-Morales, José-Miguel López-Higuera. Automated Laser-induced Breakdown Spectroscopy setup for chemical mapping of archaeological shells. Advanced Photonics. 2015; ():1.
Chicago/Turabian StyleAdolfo Cobo; Asier García-Escárzaga; Luis Rodríguez-Cobo; Igor Gutiérrez-Zugasti; Manuel R. González-Morales; José-Miguel López-Higuera. 2015. "Automated Laser-induced Breakdown Spectroscopy setup for chemical mapping of archaeological shells." Advanced Photonics , no. : 1.
After a mention of what it must be understood as Photonics field we will go into Optical Sensing area including the particular cases of the sensors using fiber technologies. Four significant cases will be presented and discussed
José-Miguel López-Higuera; Luis Rodríguez-Cobo; Adolfo Cobo. Optical Sensors: a comprehensive approach. Advanced Photonics 2015, 1 .
AMA StyleJosé-Miguel López-Higuera, Luis Rodríguez-Cobo, Adolfo Cobo. Optical Sensors: a comprehensive approach. Advanced Photonics. 2015; ():1.
Chicago/Turabian StyleJosé-Miguel López-Higuera; Luis Rodríguez-Cobo; Adolfo Cobo. 2015. "Optical Sensors: a comprehensive approach." Advanced Photonics , no. : 1.
The ability of two different machine learning approaches to map non-linear problems from experimental data is evaluated under controlled experiments. A well-known machine learning algorithm (Artificial Neural Network) is compared against a new computing paradigm (Hierarchical Temporal Memory) under a controlled scenario. The chosen scenario is the detection of impacts in a cantilever beam under vibration instrumented with fiber Bragg gratings. The main characteristics of both of the machine learning approaches are analyzed while varying environmental parameters such as the number of sensing points and their location. From the achieved results some clues can be extracted regarding dealing with noisy or partial data using different machine learning approaches.
L Rodriguez-Cobo; Jesus Mirapeix; Adolfo Cobo; Jose Miguel Lopez-Higuera. Comparison of hierarchical temporal memories and artificial neural networks under noisy data. Journal of Intelligent Material Systems and Structures 2014, 26, 1243 -1250.
AMA StyleL Rodriguez-Cobo, Jesus Mirapeix, Adolfo Cobo, Jose Miguel Lopez-Higuera. Comparison of hierarchical temporal memories and artificial neural networks under noisy data. Journal of Intelligent Material Systems and Structures. 2014; 26 (10):1243-1250.
Chicago/Turabian StyleL Rodriguez-Cobo; Jesus Mirapeix; Adolfo Cobo; Jose Miguel Lopez-Higuera. 2014. "Comparison of hierarchical temporal memories and artificial neural networks under noisy data." Journal of Intelligent Material Systems and Structures 26, no. 10: 1243-1250.
Principal and Independent Component Analysis are used in this paper to provide a discrimination among those species participating in the plasma of welding spectra. This approach might be useful for spectral line identification for emission spectroscopy, especially for online welding diagnostics and laser induced breakdown spectroscopy. In this case, the feasibility of this proposal will be analyzed by means of arcwelding experiments where different plasma species will be separated by the proposed processing scheme
Eusebio Real; J. Mirapeix; Olga M Conde; R. Ruiz-Lombera; Adolfo Cobo; J. M. López-Higuera. Species discrimination in plasma welding spectra by means of principal and independent component analysis. OFS2014 23rd International Conference on Optical Fiber Sensors 2014, 91570F -91570F-4.
AMA StyleEusebio Real, J. Mirapeix, Olga M Conde, R. Ruiz-Lombera, Adolfo Cobo, J. M. López-Higuera. Species discrimination in plasma welding spectra by means of principal and independent component analysis. OFS2014 23rd International Conference on Optical Fiber Sensors. 2014; ():91570F-91570F-4.
Chicago/Turabian StyleEusebio Real; J. Mirapeix; Olga M Conde; R. Ruiz-Lombera; Adolfo Cobo; J. M. López-Higuera. 2014. "Species discrimination in plasma welding spectra by means of principal and independent component analysis." OFS2014 23rd International Conference on Optical Fiber Sensors , no. : 91570F-91570F-4.
In this work, a low-cost WDM interrogation system has been proposed and experimentally tested to obtain two independent channels of a fiber specklegram sensor. Two lasers of different wavelengths have been launched into two multimode Polymer Optical Fibers (POFs) and then combined through a coupler before their interrogation using a RBG camera. By analyzing each color of the video sequence, the two fiber channels can be independently obtained. Besides, the speckle sensitivity has been also studied by analyzing different properties of speckle patterns such as their contrast or the speckle size. The achieved results help to the development of new fiber specklegram sensors by allowing a direct comparison between two specklegrams of different properties.
Luis Rodriguez-Cobo; M. Lomer; Adolfo Cobo; Eusebio Real. Wavelength domain multiplexed fiber specklegram sensor. OFS2014 23rd International Conference on Optical Fiber Sensors 2014, 9157, 1 .
AMA StyleLuis Rodriguez-Cobo, M. Lomer, Adolfo Cobo, Eusebio Real. Wavelength domain multiplexed fiber specklegram sensor. OFS2014 23rd International Conference on Optical Fiber Sensors. 2014; 9157 ():1.
Chicago/Turabian StyleLuis Rodriguez-Cobo; M. Lomer; Adolfo Cobo; Eusebio Real. 2014. "Wavelength domain multiplexed fiber specklegram sensor." OFS2014 23rd International Conference on Optical Fiber Sensors 9157, no. : 1.