UV-laser radiation: basic research of the potential for cleaning stained glass |
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| Institution: | 1. Instituto U. de Restauración del Patrimonio, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain;2. Instituto U. Automática e Informática Industrial, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain;3. Institute for Transuranium Elements, European Commission, Joint Research Centre (JRC), Ispra (VA), Italy;1. Institute of General Botany, Johannes Gutenberg University, Müllerweg 6, 55128 Mainz, Germany;2. Graduate School Materials Science in Mainz, Staudinger Weg 9, 55128 Mainz, Germany;3. Institute of Zoology, Johannes Gutenberg University, Müllerweg 6, 55128 Mainz, Germany;4. Center for Electron Microscopy, University Hospital, Ziegelmühlenweg 1, 07743 Jena, Germany;1. Department of Biochemistry and Molecular Biology of Plant Products, Instituto de la Grasa, CSIC, Ctra. Utrera km 1, Campus University Pablo de Olavide, Building 46, 41013 Seville, Spain;2. IFAPA, Centro Alameda del Obispo, Menéndez Pidal s/n, 14004 Córdoba, Spain |
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| Abstract: | A KrF-excimer laser operating at λ = 248 nm was used for basic studies in cleaning ancient glass surfaces. For irradiation a mask projection technique was applied. A modified optical set-up was designed using cylindrical lenses for large area removal by line scanning. Previous investigations revealed insufficient knowledge about interaction processes between UV-laser radiation and individual surface layers of encrusted historical glass. Thus, first detailed studies were carried out on special model glass samples simulating the behaviour of historical glass. The potential of removing crusts, bio layers as well as layers of different conservation materials (due to former conservation work) were examined. The avoidance of damaging material such as gel layers, paint layers or the bulk glass was of great importance. Removal rates and thresholds for the materials mentioned above were carried out. The collected data enables a comparison and evaluation of the feasibility for the removal of superficial layers from historical glass artefacts. The results indicate that in some cases a closed loop process control will be necessary to avoid over-cleaning. |
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