Optical Coherence Tomography for Examination of Parchment Degradation

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.

[1]  J. Orgel,et al.  Changes in collagen structure: drying, dehydrothermal treatment and relation to long term deterioration , 2000 .

[2]  J. Nelson,et al.  High-speed fiber based polarization-sensitive optical coherence tomography of in vivo human skin. , 2000, Optics letters.

[3]  A. Fercher,et al.  Measurement and imaging of birefringence and optic axis orientation by phase resolved polarization sensitive optical coherence tomography. , 2001, Optics express.

[4]  Matija Strlič,et al.  Historical iron gall ink containing documents — Properties affecting their condition , 2006 .

[5]  M. Odlyha,et al.  Dynamic mechanical analysis (DMA), 13c solid state nmr and micro-thermomechanical studies of historical parchment , 2003 .

[6]  C. Kennedy,et al.  Analysis of collagen structure in parchment by Small angle X-ray diffraction , 2003 .

[7]  Michael Pircher,et al.  Transversal phase resolved polarization sensitive optical coherence tomography , 2004, Physics in medicine and biology.

[8]  Maciej Wojtkowski,et al.  Optical Coherence Tomography for Artwork Diagnostics , 2006 .

[9]  Jan Marczak,et al.  Varnish Ablation Control by Optical Coherence Tomography , 2006 .

[10]  Matija Strlič,et al.  Evaluating the Effects of Treatments on Iron Gall Ink Corroded Documents. A new analytical methodology , 2004 .

[11]  R. Larsen Microanalysis of Parchment , 2007 .

[12]  Craig J Kennedy,et al.  Thermal analysis on parchments I: DSC and TGA combined approach for heat damage assessment , 2006 .

[13]  Michael Pircher,et al.  Three dimensional polarization sensitive OCT of human skin in vivo. , 2004, Optics express.

[14]  Barry Cense,et al.  Birefringence measurements in human skin using polarization-sensitive optical coherence tomography. , 2004, Journal of biomedical optics.

[15]  Matija Strlič,et al.  Iron Gall Inks: On Manufacture, Characterisation, Degradation and Stabilisation , 2006 .

[16]  Matija Strlič,et al.  Ageing and Stabilisation of Paper , 2005 .

[17]  M. Odlyha,et al.  Measurement of shrinkage behaviour in leather and parchment by dynamic mechanical thermal analysis , 2000 .