11 July 2017 3D internal reconstruction by the use of terahertz time domain imaging (THz-TDI): an application on a 15th century stucco relief
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Abstract
In the field of Cultural Heritage and conservation science the development of non-invasive tools to retrieve information on artworks and historical artifacts remains one of the most important and increasing demands. In this work a focus was made on the capability of THz imaging to investigate the internal structure of objects made of superposed plaster layers. In particular, a first attempt of investigation was made for gypsum based plaster used for a stucco reliefs. After a feasibility phase on plaster moke up samples, a 15th century painted stucco relief was investigated by means of THz-TDI in the framework of the ESPRIT project, promoted by the Louvre Museum. The objectives were to assess the presence of internal layers made of different plaster mixtures, to locate them and give useful information about the supposed manufacturing techniques. The refractive indexes of different plasters were measured. Due to multiple scattering inside the samples and the impact of the heterogeneity of the material on this refractive index, the interface between plaster/plaster seems difficult to detect.
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M. Cheung Hoi Ching, M. Cheung Hoi Ching, D. Giovannacci, D. Giovannacci, G. Gariani, G. Gariani, D. Brissaud, D. Brissaud, L. Leroux, L. Leroux, F. Goubard, F. Goubard, A. Bouquillon, A. Bouquillon, M. Bormand, M. Bormand, } "3D internal reconstruction by the use of terahertz time domain imaging (THz-TDI): an application on a 15th century stucco relief", Proc. SPIE 10331, Optics for Arts, Architecture, and Archaeology VI, 103310K (11 July 2017); doi: 10.1117/12.2269730; https://doi.org/10.1117/12.2269730
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