RT info:eu-repo/semantics/conferenceObject
T1 Challenges in laser cleaning of cultural heritage stained glass
A1 Maingi, Evan Maina
A1 Treil, Valérie
A1 Alonso Abad, Mª Pilar
A1 Angurel Lámban, Luis Alberto
A1 Rahman, Md. Ashiqur
A1 Chapoulie, Rémy
A1 Dubernet, Stéphan
A1 Schiavon, Nick
A1 Fuente Leis, Germán F. de la
K1 Tecnología
K1 Technology
K1 Arte-Burgos
K1 Art-Burgos
AB Stained-glass windows play an important role in cultural heritage. Human and environmental factors have subjected these pieces to risks of damage. Mechanical and chemical-based cleaning methods have been used for their restoration and conservation. Additionally, short-pulse lasers have opened new opportunities for safe and controlled cleaning and restoration of these important materials. In this work, ultra-short pulsed lasers were used to clean an artificially applied coating from the surface of a contemporary colorless glass frequently used in the restoration of stained-glass windows. One of the objectives was to explore the applicability of using these types of lasers to safely clean historical stained-glass windows. It was observed that temperature rise and subsequent heat accumulation in the coating layer being removed was sufficient to generate significant thermal stresses on the underlying glass surface leading to damages even when the laser energies are lower than the damage thresholds. Some laser treatments that limit this heat accumulation were designed in this study. For laser systems operating at frequencies in the range of several hundreds of kHz, the option was to work in burst mode, limiting the number of pulses in each burst and selecting an adequate time lapse between two consecutive burst runs. A method to uniformly clean a given surface is proposed in this work. When lower frequencies are available, treatments using frequencies lower than 20 kHz are enough to safely clean the glass. When UV laser radiation is used, optical damage is also an important aspect to be considered. In this case, the cleaning protocol has to deal with both issues, to avoid heat accumulation and chemical damage.
PB IOP Publishing
SN 1742-6588
YR 2022
FD 2022
LK http://hdl.handle.net/10259/7928
UL http://hdl.handle.net/10259/7928
LA eng
NO The authors acknowledge funding support from H2020-MSCA-ITN-EJD/ED-ARCHMAT action under the Marie Sklodowska-Curie grant agreement No. 766311. Partial support is obtained from Departamento de Ciencia, Universidad y Sociedad del Conocimiento of Gobierno de Aragón “Construyendo Europa desde Aragón” (research group T54_20R). This work is being performed under the framework of the Unidad Asociada de I+D+I al CSIC “Vidrio y Materiales del Patrimonio Cultural (VIMPAC)”, INMA (CSIC-University of Zaragoza) and the University of Burgos.
DS Repositorio Institucional de la Universidad de Burgos
RD 13-may-2024