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

Just published: L. Koch Dandolo, A. Cosentino, P. Uhd Jepsen “Inspection of panel paintings beneath gilded finishes using terahertz time-domain imaging” Studies in Conservation, 60 (1), S159-S166, 2015.

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

 

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.

CHSOS has been collaborating with Corinna Koch Dandolo, PhD student at the prestigious DTU (Technical University of Denmark) Fotonik, whose research focuses on developing art examination applications for the THz (Terahertz) imaging technique. This is a video about THz technique “Terahertz and Art Examination.” We did THz examination of the newly discovered frescoes in Aci Sant’Antonio and the study of two wooden statues. International Researchers are welcomed to propose scientific art examination research for field projects in Sicily.