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Authors: Adele DeCruz ; Joseph A. Izatt and Derek Nankivil

Affiliation: Duke University, United States

ISBN: 978-989-758-174-8

Keyword(s): OCT, Varnish, Paintings, Er:YAG Laser, Conservation.

Related Ontology Subjects/Areas/Topics: Computational Optical Sensing and Imaging ; Lasers ; Optical Instrumentation ; Optics ; Photonics, Optics and Laser Technology ; Waveguide Lasers

Abstract: Optical Coherence Tomography (OCT) was used to visualize and quantify the varnish layer of paintings. And to verify the success of efforts by conservators to remove the varnish using laser ablation. An Er:YAG laser (λ = 2.94μm) with a repetition rate of 15Hz and an optical power of 1mW was used to remove the varnish. A spectral domain OCT system with a Michelson topology was constructed using a broadband super-luminescent diode (λ = 840±25nm). The OCT system provided an 8μm resolution, and a field of view of 5x5mm. Samples, including pigment, varnish and substrate, approximately 1mm2 in size, were removed from the oil painting, San Giorgio Maggiore by Martin Rico (1833-1908). Varnish thickness obtained from OCT was validated by similar measurements obtained from SEM analysis. Other paintings, including a late 18th century landscape, signed Thomas Gainsborough, were imaged with OCT to compare neighboring regions before and after laser treatment and to examine the layering of the artist ’s signature in an effort to determine its authenticity. In conclusion, the non-invasive OCT technique is an efficient tool for measurement of varnish layer thickness, for imaging over-paint under varnish layers, and for assessing the effectiveness of laser assisted varnish removal. (More)

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Paper citation in several formats:
DeCruz, A.; Izatt, J. and Nankivil, D. (2016). On the Use of OCT to Examine the Varnish Layer of Paintings Cleaned with an Er:YAG Laser.In Proceedings of the 4th International Conference on Photonics, Optics and Laser Technology - Volume 1: PHOTOPTICS, ISBN 978-989-758-174-8, pages 107-112. DOI: 10.5220/0005729801070112

@conference{photoptics16,
author={Adele DeCruz. and Joseph A. Izatt. and Derek Nankivil.},
title={On the Use of OCT to Examine the Varnish Layer of Paintings Cleaned with an Er:YAG Laser},
booktitle={Proceedings of the 4th International Conference on Photonics, Optics and Laser Technology - Volume 1: PHOTOPTICS,},
year={2016},
pages={107-112},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0005729801070112},
isbn={978-989-758-174-8},
}

TY - CONF

JO - Proceedings of the 4th International Conference on Photonics, Optics and Laser Technology - Volume 1: PHOTOPTICS,
TI - On the Use of OCT to Examine the Varnish Layer of Paintings Cleaned with an Er:YAG Laser
SN - 978-989-758-174-8
AU - DeCruz, A.
AU - Izatt, J.
AU - Nankivil, D.
PY - 2016
SP - 107
EP - 112
DO - 10.5220/0005729801070112

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