Optical analysis methods

Light is the ideal probe for analyzing parchments in a non-invasive manner. Optical methods are developed in the laboratory for various applications in parchment studies.

A method combining optical spectroscopy and data processing using principal component analysis was developed for the identification of the animal species and successfully validated by proteomic analyses on tens of historical parchments. A portable fiber-optic version of the method, using an integrating sphere, is under development. A birefringence quantitative imaging method is currently developed for stress analysis in parchments. The optical setup relies on a polarizing optical microscope combined with a laser diode and liquid-crystal devices.