Inspection of panel paintings beneath gilded finishes using terahertz time-domain imaging

Corinna Ludovica Koch Dandolo, Antonino Cosentino, Peter Uhd Jepsen

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Abstract

Scientific analysis of panel paintings could provide key information to art historians and conservators about the composition and condition of the constituent layers. Knowledge of the structure, stratigraphy, and condition of the subsurface layers of these objects is highly relevant to conservation measures, when stability problems such as delamination or internal cracking are considered. Terahertz time-domain imaging (THz-TDI) in reflection geometry is capable of highlighting interfaces between layers in a stratigraphic buildup, and thus makes structural information available in the form of subsurface 3D images and stratigraphic images (B-scans). The technique is contactless and non-invasive, and has been successfully applied to investigation of panel paintings. Regarding gilded panel paintings, the extremely high reflectivity of metals at submillimeter wavelengths generally precludes the transmission of electromagnetic waves through metallic films. Therefore, imaging of subsurface features below gilded finishes may be regarded as Very challenging. A small but non-negligible direct transmission through metal films occurs if the film thickness is of the order of the skin depth of the metal in the terahertz range, due to the skin effect. The thickness of gold leaf, a fraction of a micrometer, matches the skin depth of gold in the terahertz frequency range covered by THz-TDI devices. We therefore investigated and imaged subsurface features of panel paintings through gilded finishes with THz-TDI. Subsurface layers of three gilded panel paintings (two contemporary tempera panel replicas and one fourteenth-century icon) have been successfully imaged behind gold finishes with THz-TDI.
Original languageEnglish
JournalStudies in Conservation
Volume60
Issue numberSUPPLEMENT 1
Pages (from-to)S159-S166
ISSN0039-3630
DOIs
Publication statusPublished - 2014
EventLACONA X: Lasers in the Conservation of Artworks - Sharjah, United Arab Emirates
Duration: 9 Jun 201413 Jun 2014

Conference

ConferenceLACONA X
CountryUnited Arab Emirates
CitySharjah
Period09/06/201413/06/2014

Bibliographical note

© The International Institute for Conservation of Historic and Artistic Works 2015 MORE OpenChoice articles are open access and distributed under the terms of the Creative Commons Attribution License 3.0

Keywords

  • Terahertz time domain imaging
  • Imaging techniques
  • Non-destructive characterization
  • Gilded panels
  • Panel paintings
  • Tempera panels
  • Gold leafs gilded finishes

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