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Title Detecting hidden sketch drawings and fresco layers using a novel, photoacoustic, diagnostic approach
Author Κληρονόμου, Ευγενία
Thesis advisor Ρακιτζής, Πέτρος
Abstract During the elaboration of the current study, the development of an innovative, non-destructive, detection technique for mural underdrawings was presented, based on the principles of PA microscopy. The method is based on the absorption of IR radiation by the material used for the underdrawing, which leads to the creation of a wave pressure that results in the creation of an ultrasonic wave, which is detected by the transducer. The raw signal is filtered and saved in a computer with a view to the creation of an image. It is important to mention the fact that the current work is a proof of concept study, as the mock-ups used during the measurements represent ideal cases of mural samples. Their substrate is very homogeneous and the sketches are drawn with graphite pencil, which is known from previous studies to have better absorbing traits at 1064 nm in comparison to carbon, which is the main material used for the underdrawings of murals. Better absorption leads to the production of ultrasound waves with higher amplitudes, which is translated as greater contrast in the constructed image. Nevertheless, the results of the experiment are very promising and the method has demonstrated the excellent capabilities of PAI to uncover hidden content in a mural sample consisting of different pigments, or even, gypsum. Lastly, we should report the fact that the specific technique is relatively low-cost and it does require a very sophisticated or complex configuration. We hope that with proper modifications and enhancements, this experimental set-up could become a useful tool for art conservators and restorers.
Language English
Issue date 2021-07-28
Collection   School/Department--School of Sciences and Engineering--Department of Physics--Graduate theses
  Type of Work--Graduate theses
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