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- Title
Optimum spectral window for imaging of art with optical coherence tomography.
- Authors
Liang, Haida; Lange, Rebecca; Peric, Borislava; Spring, Marika
- Abstract
Optical coherence tomography (OCT) has been shown to have potential for important applications in the field of art conservation and archaeology due to its ability to image subsurface microstructures non-invasively. However, its depth of penetration in painted objects is limited due to the strong scattering properties of artists' paints. VIS-NIR (400-2,400 nm) reflectance spectra of a wide variety of paints made with historic artists' pigments have been measured. The best spectral window with which to use OCT for the imaging of subsurface structure of paintings was found to be around 2.2 μm. The same spectral window would also be most suitable for direct infrared imaging of preparatory sketches under the paint layers. The reflectance spectra from a large sample of chemically verified pigments provide information on the spectral transparency of historic artists' pigments/paints as well as a reference set of spectra for pigment identification. The results of the paper suggest that broadband sources at ~2 μm are highly desirable for OCT applications in art and potentially material science in general.
- Subjects
OPTICAL coherence tomography; ART conservators; ARCHAEOLOGY; MICROSTRUCTURE; REFLECTANCE spectroscopy; INFRARED imaging; SCATTERING (Physics)
- Publication
Applied Physics B: Lasers & Optics, 2013, Vol 111, Issue 4, p589
- ISSN
0946-2171
- Publication type
Article
- DOI
10.1007/s00340-013-5378-5