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Proceedings Paper

Nonintrusive tools to detect salts contamination in masonry: case study of Fontaine-Chaalis church
Author(s): David Giovannacci; Didier Brissaud; Jean-Didier Mertz; Kamel Mouhoubi; Jean-Luc Bodnar
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Paper Abstract

Such developments come from conservation experts in the community of cultural heritage - encompassing artworks, museum artifacts or historical monuments - for less intrusive and non-destructive tools to gain information about the subject. Increasingly the demand is for information regarding internal structures and indications of life histories and behaviors of an object. As it is well known, the deterioration due to the capillary rise of water through the walls is a very widespread problem. In this paper, a study of Stimulated Infrared thermography and Evanescent-Field Dielectrometry was applied to a non-destructive mapping, in situ, and in a semi-quantitative way the distribution of water, salt and the structural deterioration induced in a wall of the 13th century of the abbey’s church of Chaalis. Complementarity of the both techniques will be underlined. The Stimulated Infra-Red Thermography (SIRT) is a contact free technique and allows the detection of plaster layers delamination of masonry. Evanescent-Field Dielectrometry (EFD) is a recent diagnostic method based on dielectric spectroscopy at microwave frequency. The measuring instrument is a portable resonant microwave device for mapping the water content and salinity on flat surface up to a depth of 2–3 cm in real time, in a non-destructive way. The method detects the water content and salt concentration in frescoes and walls by estimating the dielectric properties of tested porous materials that is viewed as a “binary” dielectric mixture consisting of bulk material and water, by the contrast between the dielectric constant of a dry material and water. According to the resolution of the optics, the SIRT has a less lateral resolution and more limited in depth, but it is easy to implement and can be used on-site, like in scaffolding conditions. Moreover, this technique gives an overview at a larger scale (metric) than EFD (centimetric).

Paper Details

Date Published: 11 July 2017
PDF: 7 pages
Proc. SPIE 10331, Optics for Arts, Architecture, and Archaeology VI, 1033103 (11 July 2017); doi: 10.1117/12.2269727
Show Author Affiliations
David Giovannacci, Lab. de Recherche des Monuments Historiques, CNRS (France)
Didier Brissaud, Lab. de Recherche des Monuments Historiques, CNRS (France)
Jean-Didier Mertz, Lab. de Recherche des Monuments Historiques, CNRS (France)
Kamel Mouhoubi, Univ. de Reims Champagne-Ardenne (France)
Jean-Luc Bodnar, Univ. de Reims Champagne-Ardenne (France)

Published in SPIE Proceedings Vol. 10331:
Optics for Arts, Architecture, and Archaeology VI
Luca Pezzati; Piotr Targowski, Editor(s)

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