Varnish Ablation Control by Optical Coherence Tomography

Góra, Michalina; Targowski, Piotr; Rycyk, Antoni; Marczak, Jan

doi:https://doi.org/10.1155/2006/10647

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Lasers in the Preservation of Cultural Heritage

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Research Article | Open Access

Volume 2006 | Article ID 010647 | https://doi.org/10.1155/2006/10647

Varnish Ablation Control by Optical Coherence Tomography

Michalina Góra,¹Piotr Targowski,¹Antoni Rycyk,²and Jan Marczak²

Academic Editor: Costas Fotakis

Received15 Sept 2006

Accepted07 Nov 2006

Published14 Jan 2007

Abstract

Preliminary results of the application of optical coherence tomography (OCT), in particular in its spectral mode (SOCT) to the control of a varnish ablation process, are presented. Examination of the ablation craters made with an Er:YAG laser allows optimization of the laser emission parameters controlling fluence with respect to efficiency and safety of the ablation process. Results of measurements of ablation crater depth as a function of the number of pulses for a given fluence are presented for selected resins. This validates the applicability of SOCT to calibration of ablation conditions for the particular laser-varnish-paint layer combinations, and of its usage in planning the varnish ablation procedure. These results also imply that a review of conventional ablation thresholds is called for. Applicability of the SOCT technique to contemporaneous in situ monitoring of the range of varnish ablation is discussed.

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Copyright

Copyright © 2006 Michalina Góra et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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