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Toward the comprehensive spectrochemical imaging of painted works of art: a new instrumental approach
Author(s) -
Weis Tahlia L.,
Jiang Yanan,
Grant Edward R.
Publication year - 2004
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1214
Subject(s) - raman spectroscopy , preprocessor , normalization (sociology) , pigment , subtraction , background subtraction , chemistry , biological system , analytical chemistry (journal) , artificial intelligence , optics , computer science , chromatography , mathematics , physics , organic chemistry , pixel , biology , arithmetic , sociology , anthropology
This paper introduces novel technologies that will be instrumental in the development of new methods for the Raman spectrochemical imaging of painted works of art. We show that second‐derivative preprocessing diminishes interference from fluorescence. Normalization and mean‐centering of such second‐derivative spectra cast them in the form of unit vectors, the displacement of which from library standards serves as a basis for the instantaneous on‐line identification of artistic pigments and binders. Multivariate measures of displacement are shown to function well in difficult cases such as spectrally similar fatty acid media and pigments diluted to varying degrees in uncharacterized binders. A self‐calibrating technique for background subtraction extracts pure component spectra from pigment–acrylic mixtures. Copyright © 2004 John Wiley & Sons, Ltd.