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Identifier |
000454099 |
Title |
Laser assisted thinning of aged varnish coatimgs on painted artworks : Real-time monitoring of the laser ablation process and assessment of the treated surfaces |
Alternative Title |
Φωτοαποδόμηση γηρασμένων βερνικιών από ζωγραφικους πίνακες |
Author
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Δημητρουλάκη, Ευδοξία
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Thesis advisor
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Παπάζογλου, Δημήτριος
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Reviewer
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Βαμβακάκη, Μαρία
Αγγλος, Δημήτριος
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Abstract |
Varnish layers, commonly found as protective coatings in numerous heritage objects, undergo degradation mechanisms leading to their deterioration, and thus their removal becomes imperative
in the context of conservation practices. Ultraviolet (UV) laser ablation constitutes an exceptionally promising cleaning approach, however it may be significantly reinforced with realtime monitoring of the ablation process. In this study, photoacoustic monitoring was employed in order to investigate its potential in monitoring the laser ablation process of aged varnish coatings,
in the framework of real-time comparison of the photoacoustic (PA) signals produced upon
material removal by UV light. In this novel technique, an air-coupled transducer capable of
recording acoustic waves in the MHz regime, is set in a non-contact geometry close to the object
undergoing laser cleaning, in order to detect the PA signals generated upon the laser assisted thinning of varnish. The feasibility of this approach lies on two major indicators; the amplitude of
the PA signal, as well as its temporal delay, which are providing us with crucial information that
can be exploited to effectively monitor this highly sensitive cleaning process. Based on these premises, a statistical methodology is proposed aiming at the determination of the critical laser
pulse responsible for revealing the substrate. Microscopic and imaging techniques were further exploited, so to confirm the cleaning level on the tested varnish mock-ups. Hence, the treated surfaces after laser ablation were carefully assessed on the basis of their morphology using various techniques including microscopy, optical coherence tomography (OCT) and profilometry.
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Language |
English |
Subject |
Photoacoustic |
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Varnishes |
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Βερνίκια |
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Βερνίκια |
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Καθαρισμός με λέιζερ |
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Παρακολούθηση |
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Φωτοακουστικό |
Issue date |
2023-03-29 |
Collection
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School/Department--School of Sciences and Engineering--Department of Materials Science and Technology--Post-graduate theses
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Type of Work--Post-graduate theses
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Permanent Link |
https://elocus.lib.uoc.gr//dlib/e/5/7/metadata-dlib-1684919679-675715-25605.tkl
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Views |
609 |
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