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Proceedings Paper

The potential of UV-VIS-NIR absorption spectroscopy in glass studies
Author(s): Wendy Meulebroeck; Kitty Baert; Andrea Ceglia; Peter Cosyns; Hilde Wouters; Karin Nys; Herman Terryn; Hugo Thienpont
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Paper Abstract

Absorption spectroscopy is the technique that measures the absorption of radiation as a function of wavelength, due to its interaction with the material. During a research project funded by our home university, we were able to investigate the possibilities of this technique to study ancient glasses. One of our main conclusions is that UV-VIS-NIR absorption spectroscopy is especially suited to characterize colored artifacts in terms of composition and furnace conditions. Moreover, for naturally colored window glasses, we have shown that this technique allows us to classify fragments based on differences in iron impurity levels. It is a semi-quantitative analysis tool that can be applied for a first-line analysis of (large) glass collections. Thanks to the commercial available portable instruments, these measurements can be performed at relative high speed and this in-situ if necessary. To illustrate the possibilities of this technique, we describe in this paper two case-studies. In a first test-case we analyze 63 naturally colored window glasses and demonstrate how groups with different iron concentrations can be identified by calculating the absorption edge position from the measured optical spectrum. In a second case-study 8 modern naturally colored and 31 intentionally colored Roman glass fragments are the point of focus. For these samples we first estimate which samples are potentially fabricated under the same furnace conditions. This is done based on the calculated color values. Finally we identify the type of applied colorants.

Paper Details

Date Published: 7 November 2012
PDF: 11 pages
Proc. SPIE 8422, Integrated Approaches to the Study of Historical Glass, 842208 (7 November 2012); doi: 10.1117/12.975684
Show Author Affiliations
Wendy Meulebroeck, Vrije Univ. Brussel (Belgium)
Kitty Baert, Vrije Univ. Brussel (Belgium)
Andrea Ceglia, Vrije Univ. Brussel (Belgium)
Peter Cosyns, Vrije Univ. Brussel (Belgium)
Hilde Wouters, Vrije Univ. Brussel (Belgium)
Karin Nys, Vrije Univ. Brussel (Belgium)
Herman Terryn, Vrije Univ. Brussel (Belgium)
Hugo Thienpont, Vrije Univ. Brussel (Belgium)

Published in SPIE Proceedings Vol. 8422:
Integrated Approaches to the Study of Historical Glass
Hugo Thienpont; Wendy Meulebroeck; Karin Nys; Dirk Vanclooster, Editor(s)

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