V. Detalle

Université de Cergy-Pontoise · Department of Electrical Engineering and Computer Science

Curators have developed preventive conservation strategies and usually try to control the temperature (T) and relative humidity (RH) variations in the museum rooms to stabilise the artworks. The control systems chosen by museums depend on the size and age of the building, the financial means and the strategies that can be adapted. However, there is...

The quantitative determination of heavy metals in aquatic products is of great importance for the food security issues. Laser-induced breakdown spectroscopy (LIBS) has been used in a variety of foodstuffs analysis, but is still limited by its low sensitivity when targeting on the trace heavy metals. In this work, we compared three sample enrichment...

Active thermography was used as a multispectral non-destructive approach for characterisation of multi-layered panel paintings and analysis of their defects caused by aging and environmental effects. Two oil compositions painted on canvas, provided by C2RMF in the Louvre museum (Centre de Recherche et de Restauration des Musées de France) were unde...

The carbon content distribution of ferrous archaeological artefacts in a quantitative way allows us to understand the nature of the materials. Our previous works have ever proved that the use of laser-induced breakdown spectroscopy (LIBS) could be an efficient method to solve problems of in situ analysis and offer a high spatial resolution. To asse...

Laser-induced breakdown spectroscopy (LIBS) is a versatile elemental analytical technique whose basic elements were described as early as 1962, shortly after the invention of a pulsed laser. Since that time, LIBS has been applied for elemental characterization of various applications. In this work, we review the evolution of LIBS characterization o...

Red lead and lead white are some of the most ancient and common pigments in mural paintings. However, they tend to blacken with time due to their oxidation to plattnerite (β-PbO2). The possibility to induce the reconversion reactions by CW laser heating is hereby discussed. A thermodynamic study by TGA showed that direct cerussite or hydrocerussite...

Red lead and lead white are some of the most ancient and common pigments in mural paintings. However, they tend to blacken with time due to their oxidation to plattnerite (\b{eta}-PbO2). The possibility to induce the reconversion reactions by CW laser heating is hereby discussed. A thermodynamic study by TGA showed that direct cerussite or hydrocer...

In consequence of the flooding of the Loing river in 2016, some of the storage areas for the Musée Girodet were submerged, with 3000 artworks affected. Following this, the painting Le Jeune Trioson (nineteenth century, attributed to the school of Anne-Louis Girodet De Roucy Trioson) developed severe blanching in the varnish, over the dark backgroun...

The presence of carbon content is a key enabling factor in archaeological ferrous material studies because it can provide technological and temporal information on its fabrication. A strong relationship exists between the composition, the metallographic structure, and the mechanical properties of metals. Laser-induced breakdown spectroscopy (LIBS)...

The nine ceiling paintings at the Banqueting House Whitehall, painted by Peter Paul Rubens and studio is one of the largest and most complex works by the master, and has survived in its original location for almost 400 years. Historic Royal Palaces’ current Banqueting House Whitehall conservation and re-presentation project provided a rare opportun...

Within the framework of conservation and assistance for the restoration of cultural property, a method of analysis assistance has been developed to help in the restoration of cultural heritage. Several collaborations have already demonstrated the possibility of defects detection (delamination, salts) in murals paintings using stimulated infrared th...

Infrared thermography is a non-destructive testing technique that affects many areas. This technique of analysis is, for example, very interesting in the field of restoration and conservation of heritage works. The possibilities of active thermography can help in the early detection of defects in works of art and their characterization. In this wor...

The study and analysis of defects in wall paintings is possible by stimulated infrared thermography, this approach is of great interest to the scientific community responsible for the conservation and restoration of these works of art. The work presented consists in identifying the best way to stimulate and analyze the thermal signals measured on t...

This paper presents first laboratory results of a combined approach carried out by the use of three different portable non-invasive electromagnetic methods: Digital holographic speckle pattern interferometry (DHSPI), stimulated infrared thermography (SIRT) and holographic subsurface radar (HSR), proposed for the analysis of a custom-built wall mosa...

The influence of ns-laser wavelength to discriminate ancient painting techniques such as are fresco, casein, animal glue, egg yolk and oil was investigated in this work. This study was carried out with a single shot laser on samples covered by a layer made of a mixture of the cinnabar pigment and different binders. Three wavelengths based on Nd: YA...

In this study, we provide a new application of laser-induced breakdown spectroscopy (LIBS) to evaluate whether ancient bones contain sufficient organic material before radiocarbon dating, which can avoid a complex preliminary analysis of the samples or unnecessary sampling. We examined, as the first step, the plasma induced by a UV (266 nm) ns-lase...

Terahertz time-domain imaging (THz-TDI) and spectral-domain optical coherence tomography (SD-OCT) are two techniques capable of providing 3D datasets from which depth profiles and cross-sectional images of an object can be derived. They are novel photonics technologies of particular relevance to the field of heritage science, for which the comprehe...

Après avoir connu un essor sans précédent pour les applications biomédicales dès 1991, la tomographie en cohérence optique (OCT) s’est étendue à différentes disciplines d’étude des matériaux. Parmi les plus intéressantes on peut aujourd’hui y ajouter l'histoire de l'art technique et matériel, la conservation et la restauration d'objets du patrimoin...

Background and methods: Wall paintings and architectural surfaces in outdoor environments are exposed to several physical, chemical and biological agents, hence they are often treated with different products to prevent or slow down their deterioration. Among the factors that have to be taken into account in the selection of the most suitable treat...

Analysis of heritage stone samples, alabaster, gypsum, limestone and marble, and model wall paintings was carried out with a laboratory, hybrid system based on the pulsed laser excitation of Raman, laser-induced fluorescence and laser-induced breakdown spectroscopy signals. The system is based on a nanosecond Q-switched Nd:YAG laser operating at it...

In this unique collection the authors present a wide range of interdisciplinary methods to study, document, and conserve material cultural heritage. The methods used serve as exemplars of best practice with a wide variety of cultural heritage objects having been recorded, examined, and visualised. The objects range in date, scale, materials, and st...

The aim of this research project was the development of a hybrid system in laboratory coupling together three analytical techniques, namely laser-induced breakdown spectroscopy (LIBS), laser-induced fluorescence (LIF) and Raman spectroscopy in a single instrument. The rationale for combining these three spectroscopies was to identify a material (mo...

In the field of cultural heritage conservation, wall paintings treatment is a particularly complex issue, which requires a suitable choice of materials. In this paper, two innovative calcium alkoxides, calcium tetrahydrofurfuryl oxide [Ca(OTHF)2] and calcium ethoxide [Ca(OEt)2], are proposed as new products for the consolidation of wall paintings....

The influence of ns-laser wavelength to discriminate ancient painting techniques such as are fresco, casein, animal glue, egg yolk and oil was investigated in this work. This study was carried out with a single shot laser on samples covered by a layer made of a mixture of the cinnabar pigment and different binders. Three wavelengths based on Nd: YA...

The investigation of cultural heritage materials is always complex and specific because unique. Materials are most often heterogeneous and organized in several layers such as mural paintings or corrosion products. The characterization of a complete artwork's stratigraphy is actually one of the questions of science conservation. Indeed, the knowledg...

In the field of art conservation there is an increased demand for non destructive and non invasive techniques able to perform remote defect detection for structural evaluation of historical structures and works of art. The techniques must have some basic important characteristics as non destructivity, accuracy, repeatability and desired features as...

We analyze Chinese ink and cinnabars on paper by means of ArF laser-excited fluorescence of ablation plumes. The technique is minimally destructive and can detect multi-elements simultaneously. It is based on a two-laser-pulse scheme: the first 355 nm laser pulse ablates a thin layer of the ink; the second 193 nm laser pulse induces multi analytes...

The sufficient space resolved localisation of gaps and voids in building parts like masonry or plaster is a major problem. Especially on heritage material preferentially non-destructive methods are desirable. A promising technique for that kind of investigation is active IRT. Compared to the still most widely used percussion investigation thermogra...

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The sufficient space resolved localization of gaps and voids in building parts like masonry or plaster is a major problem. Especially on heritage material preferentially non-destructive methods are desirable. A promising technique for that kind of investigation is active IRT. Compared to the still most widely used percussion investigation thermogra...

The Château de Germolles is one of the rare palaces in France dating from the 14th century. The noble floor is decorated with wall paintings that are a unique example of courtly love spirit that infused the princely courts of the time. After being concealed sometime in the 19th century, the paintings were rediscovered and uncovered in the middle of...

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In this work, we present a new method for estimating the local thermal diffusivity of fresco. This method uses a temporal analysis of the thermal response of a work of art submitted to a local laser excitation. First, we present the principle of the estimation method. Then, we show theoretically with the help of numerical simulations, the feasibili...

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Short abstract Within the framework of the cultural heritage conservation, stimulated infrared thermography has already demonstrated its efficiency. However, sometimes, the different colors of the paint layer can lead to artifacts of detection. In this work, we show theoretically and experimentally that the combination of a PPT analysis and of the...

In this work, we study the possibilities of stimulated Infrared Thermography for NaCl detection in Avignon calcareous stones. We show experimentally that the presence of salts leads to an increase in local thermal effusivity and to a decrease in maximum temperature induced by the photothermal flash analyze. We show then, that measurement of these p...

PRIX BIOT FOURIER

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Nowadays, Laser-Induced Breakdown Spectroscopy (LIBS) is frequently used for in situ analyses to identify pigments from mural paintings. Nonetheless, in situ analyses require a robust instrumentation in order to face to hard experimental conditions. This may imply variation of fluencies and thus inducing variation of LIBS signal, which degrades spe...

This paper presents measurements of the terahertz properties of the art conservation substance cyclododecane, demonstrating that it can act as a contrast improving agent in the terahertz imaging of concealed wall paintings. Results are presented which show that the terahertz optical properties of cyclododecane are dependent on the rate at which it...

Cyclododecane (CDD) is a wax-like hexane used as a totally reversible, volatile binding medium for many cultural heritage applications. We investigate CDD using THz-TDS and DFTS, and consider its potential as a contrast enhancing agent for multilayer fresco paintings.

The abbey’s church of Chaalis, in the North of Paris, was founded by Louis VI as a Cistercian monastery on 10th January 1137. In 2013, in the frame the European Commission's 7th Framework Program project CHARISMA [grant agreement no. 228330] the chapel was used as a practical case-study for application of the work done in a task devoted to best pra...

We systematically examined the mid-20th century Italian painting "After Fishing" (fig. 1) by Ausonio Tanda using multi-spectral (UV, RGB visible, tri-band IR), x-ray and terahertz time-domain spectroscopic imaging. THz-TDSI was performed in both transmission and reflection geometries and the results were compared.

Marseille (CICRP) mènent depuis plus de 10 ans des recherches conjointes en vue de détecter et de caractériser des défauts dans des peintures murales du patrimoine. Pour cela, ils mettent en oeuvre la thermographie infrarouge stimulée. Au cours de ces années, ces trois équipes se sont principalement intéressées, avec succès, aux défauts de nature s...

Dans le cadre de la conservation et de l'aide à la restauration des biens culturels, le Laboratoire de Recherche des Monuments Historiques (LRMH), le Centre Interdisciplinaire de Conservation et Restauration du Patrimoine (CICRP) et Le Groupe de Recherche en Sciences Pour l'Ingénieur (GRESPI) de l'Université de Reims développent de nouvelles méthod...