Monitoring the Natural Heating of Two Art Nouveau Glass Windows by Infrared Thermography

UID/EAT/00729/2019 SFRH/BPD/108403/2015publishersversionpublishe

Impact of solar radiation and environmental temperature on Art Nouveau glass windows

Fundacao para a Ciencia e Tecnologia of Portugal (Project Ref. UID/EAT/00729/2019). Fundacion General CSIC of Spain (ComFuturo Programme). We also acknowledge support of the publication fee by the CSIC Open Access Publication Support Initiative through its Unit of Information Resources for Research (URICI).This work presents the results of the evaluation of two Art Nouveau glass windows from the Casa-Museu Dr. Anastácio Gonçalves (Lisbon, Portugal) with IR-thermography during the summer solstice. According to the measurements, the surface temperature of glass depended on the outdoor environmental temperature and, mainly, on the direct solar radiation. Colored glasses presented a higher surface temperature due to the absorption of their chromophores at near-IR wavelengths. Enamels and grisailles showed higher surface temperatures than their support glasses due to both their chemical composition and color. The protective glazing, with small slits in one of the window panels, induced a hot-air pocket in its upper part due to the insufficient ventilation.[Figure not available: see fulltext.]publishersversionpublishe

Caractérisation d’un mastic prêt à l’emploi peu connu pour le comblement superficiel des céramiques : le Flügger Filler Interior

Le comblement des manques superficiels (éclats, manques le long des lignes de cassure) est une problématique récurrente en restauration de céramiques. Dans la pratique, les restaurateurs utilisent certains produits prêts à l’emploi, parmi lesquels le Modostuc et le Flügger Filler Interior, car ils sont très faiblement toxiques et d’une mise-en-œuvre aisée. La perception des utilisateurs, lors de l’emploi de ces deux produits, laisse présumer certaines différences, notamment au niveau de leur rugosité, de leur dureté et de leur adhérence à la pâte céramique. L’objet de cette étude est de mettre en place une procédure expérimentale simple et adaptée permettant de différencier, par la mesure, les propriétés mécaniques de ces produits. Les résultats obtenus indiquent clairement des dissimilitudes et pourront servir de base dans le choix du produit le plus adapté à chaque céramique traitée.Filling in superficial gaps (chips, losses along cracks) is a recurrent problem in ceramic restoration. In practice, restorers employ certain ready-to-use products, among which are Modostuc and Flügger Filler Interior, because they have low toxicity and are easy to use. While employing these two products, users noticed differences, particularly in their roughness, hardness and adhesion to the ceramic. The purpose of this study was to establish a simple, specially adapted, experimental procedure enabling us to differentiate, by measuring, the mechanical properties of these products. The results obtained clearly indicated the differences and may now serve as a basis for choosing the most suitable product to use on each ceramic in need of restoration

Terahertz pulse investigation of paleolithic wall etchings

Results are presented of an examination of flow rock-covered Paleoloithic cave art using time-domain terahertz reflectometry

Cyclododecane as a contrast improving substance for the terahertz imaging of artworks

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 has cooled from the melt. Based on the results, a theoretical explanation of the contrast enhancement mechanism is postulated. The findings presented here may lead to the development of novel coating materials that could improve the quality of terahertz images in a variety of fields and not just in art conservation

Contribution à l'étude des échanges à l'interface bulle liquide, issue d'un éjecteur venturi horizontal, en vue du traitement des poussières

PARIS7-Bibliothèque centrale (751132105) / SudocSudocFranceF

Comparative study of mid-20 th C. Art using THz and X-ray imaging

International audienceWe systematically studied the mid-20th century Italian oil panel painting "After Fishing" by Ausonino Tanda using x-ray transmission and terahertz time-domain transmission and reflection spectroscopic imaging (THz-TDSI)

Terahertz analysis of stratified wall plaster at buildings of cultural importance across Europe

Terahertz (THz) radiation is being developed as a tool for the analysis of cultural heritage, and due to recent advances in technology is now available commercially in systems which can be deployed for field analysis. The radiation is capable of penetrating up to one centimetre of wall plaster and is delivered in ultrafast pulses which are reflected from layers within this region. The technique is non-contact, non-invasive and non-destructive. While sub-surface radar is able to penetrate over a metre of wall plaster, producing details of internal structures, infrared and ultraviolet techniques produce information about the surface layers of wall plaster. THz radiation is able to provide information about the interim region of up to approximately one centimetre into the wall surface. Data from Chartres Cathedral, France, Riga Dome Cathedral, Latvia, and Chartreuse du Val de Bénédiction, France is presented each with different research questions. The presence of sub-surface paint layers was expected from documentary evidence, dating to the 13th Century, at Chartres Cathedral. In contrast, at the Riga Dome Cathedral surface painting had been obscured as recently as 1941 during the Russian occupation of Latvia using white lead-based paint. In the 13th Century, wall paintings at the Chapel of the Frescos, Chartreuse du Val de Benediction in Villeneuve les Avignon were constructed using sinopia under-painting on plaster covering uneven stonework.. This paper compares and contrasts the ability of THz radiation to provide information about sub-surface features in churches and Cathedrals across Europe by analysing depth based profiles gained from the reflected signal. © (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE)