Optical Coherence Tomography for Examination of Parchment Degradation

Góra, Michalina; Pircher, Michael; Götzinger, Erich; Bajraszewski, Tomasz; Strlic, Matija; Kolar, Jana; Hitzenberger, Christoph K.; Targowski, Piotr

doi:https://doi.org/10.1155/2006/68679

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Lasers in the Preservation of Cultural Heritage

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Research Article | Open Access

Volume 2006 | Article ID 068679 | https://doi.org/10.1155/2006/68679

Optical Coherence Tomography for Examination of Parchment Degradation

Michalina Góra,¹Michael Pircher,²Erich Götzinger,²Tomasz Bajraszewski,¹Matija Strlic,³Jana Kolar,⁴Christoph K. Hitzenberger,²and Piotr Targowski¹

Academic Editor: Costas Fotakis

Received20 Sept 2006

Revised20 Nov 2006

Accepted22 Nov 2006

Published24 Jan 2007

Abstract

A novel application of Optical Coherence Tomography utilizing infrared light of 830 nm central wavelength for non invasive examination of the structure of parchment, some covered with iron gall ink, is presented. It is shown that both the parchment and the ink applied are sufficiently transparent to light of this wavelength. In the study, Spectral OCT (SOCT) as well as Polarisation Sensitive OCT (PS-OCT) techniques were used to obtain cross-sectional images of samples of parchment based on scattering properties. The second technique was additionally employed to recover the birefringence properties and the optical axis orientations of the sample. It was shown that freshly produced parchment exhibits a degree of birefringence. However, this property declines with ageing, and samples of old parchment completely depolarise the incident light.

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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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