Optical Coherence Tomography for Heritage Science
Piotr Targowski
Nicolaus Copernicus University in Toruń, Poland
Optical Coherence Tomography (OCT) is an originating from medicine diagnostic non-contact and non-invasive technique of optical sectioning. The OCT technique offers a micrometre-level in-depth resolution. It, therefore, is well suited for the investigation of fine sub-surface details of structures which absorb infrared light moderately, such as varnishes, glazes and underdrawings of paintings on canvas, reverse painting on glass, glazes on porcelain and faience, jade, historical glass, and many others. Images obtained by OCT (the tomograms) are usually presented in the convenient manner of cross-sectional views, similar to microscopic photographs of cross-sections of samples collected from the object.
A brief introduction to the technique and essentials of the construction of the OCT instruments will be presented. The advantages and limitations of the technique will be addressed, and a key to read tomograms will be given. Then using examples from our practice, it will be shown how the OCT technique may be used to examine the structure of various artworks and some archaeological objects, trace former conservation attempts, and help monitor some restoration procedures. All results to be shown have been obtained with a spectral domain portable high-resolution OCT system built in the author’s laboratory, especially for examining objects of art in situ. Still, an overview of commercially available instruments will be also given.
Department of Archaeology Zoom04 is inviting you to a scheduled Zoom meeting.
Topic: Pitt Rivers Seminar
Time: Nov 18, 2022 12:30 PM London
Every week on Fri, until Dec 2, 2022, 3 occurrence(s)
Nov 18, 2022 12:30 PM
Nov 25, 2022 12:30 PM
Dec 2, 2022 12:30 PM
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