Development of nondestructive inspection tools for cultural heritage artefacts with 3D THz imaging

Corinna Ludovica Koch Dandolo

Research output: Book/ReportPh.D. thesisResearch

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Abstract

The ability of terahertz time-domain imaging (THz-TDI) to visualize surface and subsurface features of artworks has recently been established. A limitation in imaging subsurface features by THz-TDI in reflection mode is the difficulty to handle THz signal separation when the surface of the layer to be imaged, wherever located within the dielectric stratigraphy of the object, is uneven, especially when dealing with inhomogeneous layers as regards to the composition, thickness and morphology. Those conditions often occur when dealing with artefacts inspection, in which case the conditions are worsened by the fact that often a large portion of an method that handles these problems allowing a clear representation of each subsurface layer in the artwork is presented. Thus, insights about the artistic technique and preservation state of real valuable artefacts were obtained non-invasively, where the 3D rendering of the imaged structures was also improved and THz frequency analysis as well as false color rendering (FC) allowed to better performing surface and subsurface materials areal mapping and discrimination by enhancing contrast.
The THz-TD system was carried inside museum collections for examining inestimable visible and hidden paintings painted by famous artist, such as Fra Angelico, Nicolai Abilgaard and David Teniers The Younger. To the best of our knowledge, for the first time lacquerwares have been examined by THz-TDI. It follows that this research work has broadened the comprehension of the capabilities of the THz-TDI applied to artifacts inspection, also comparing the information it provides with that obtained by other standard imaging techniques.
Original languageEnglish
PublisherTechnical University of Denmark
Number of pages203
Publication statusPublished - 2015

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