HISTORICAL PLASTER COMPOSITION DETECTION USING REFLECTANCE SPECTROSCOPY
DOI:
https://doi.org/10.14311/CEJ.2016.04.0023Keywords:
Reflectance spectroscopy, plaster, composition detection, spectral library, QSdata softwareAbstract
Reflectance spectroscopy is a non-invasive method that is based on the fact that a specific
object/material provides various reflectances in different wavelengths across the spectral range. It
can provide unique information regarding the material composition of the object of interest and has
been used in many fields in recent years. Determining composition of historical plaster is very
important when defining its individual components and possibly place of origin or even its age. This
information can be a key issue for its future repairs that are desired to be done as similar to the
original method as possible.
For a precise reflectance spectroscopy material detection, a fine spectral library is needed.
Special mathematical methods are used for comparison of measured spectral curve with individual
spectral curves stored in the used spectral library. The spectral analysis then shows similarity of
the measured curve with the reference ones.
This paper introduces results of the new plaster composition spectral library created by
Department of Geomatics, Faculty of Civil Engineering, Czech Technical University in Prague
within the Czech Ministry of Culture Project (DF13P01OVV002). This spectral library has been
tested on two historical plaster samples.
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References
SMITH, Randal B. Introduction to hyperspectral imaging. In: MicroImages [online]. 2012 [cit. 2012-
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Calibrated Diffuse Reflectance Targets. LabSphere [online]. [cit. 2015-11-25]. Dostupné z:
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Franc, Vojtěch; Hlaváč, Václav; Navara, Mirko (2005). "Computer Analysis of Images and Patterns".
Lecture Notes in Computer Science. 3691: 407. doi:10.1007/11556121_50. ISBN 978-3-540-28969-2
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