Your browser does not support JavaScript!

Home    Search  

Results - Details

Search command : Author="Βαμβακάκη"  And Author="Μαρία"

Current Record: 7 of 72

Back to Results Previous page
Next page
Add to Basket
[Add to Basket]
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 Δημητρουλάκη, Ευδοξία
Thesis advisor Παπάζογλου, Δημήτριος
Reviewer Βαμβακάκη, Μαρία
Αγγλος, Δημήτριος
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.
Language English
Subject Photoacoustic
Varnishes
Βερνίκια
Βερνίκια
Καθαρισμός με λέιζερ
Παρακολούθηση
Φωτοακουστικό
Issue date 2023-03-29
Collection   School/Department--School of Sciences and Engineering--Department of Materials Science and Technology--Post-graduate theses
  Type of Work--Post-graduate theses
Permanent Link https://elocus.lib.uoc.gr//dlib/e/5/7/metadata-dlib-1684919679-675715-25605.tkl Bookmark and Share
Views 400

Digital Documents
No preview available

No permission to view document.
It won't be available until: 2025-03-29