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Developing Macro-Raman Mapping as a Tool for Studying the Pigment Distribution of Art Objects
Peter Vandenabeele1,2, Anastasia Rousaki1
1Department of Chemistry, Raman Spectroscopy Research Group, Ghent University, S-12, Krijgslaan 281, B-9000 Ghent, Belgium.
Analytical Chemistry
|November 12, 2021
Summary
This study introduces macro-Raman mapping for large-scale, non-destructive molecular analysis of artworks. The new setup enables detailed visualization of molecular distribution across significant surface areas.
Area of Science:
- Analytical Chemistry
- Art Conservation Science
- Spectroscopy
Background:
- Raman spectroscopy is vital for non-destructive molecular analysis in cultural heritage.
- Raman mapping visualizes molecular distribution with excellent spatial resolution.
- Current methods are limited in mapping large artwork areas.
Purpose of the Study:
- To develop and demonstrate a macro-Raman mapping setup for analyzing large artwork surfaces.
- To enable detailed spatial mapping of molecular components in cultural heritage objects.
Main Methods:
- A novel macro-Raman mapping system was engineered using a mobile Raman spectrometer and fast translation stages.
- A triangulator was integrated for precise distance measurement and accurate focusing.
- A calibration module was developed for spectral calibration and probe alignment.
Main Results:
- The developed setup successfully mapped large areas (tens to hundreds of square centimeters) of artworks.
- Demonstrated the capability to visualize the spatial distribution of molecules across extensive surfaces.
- Illustrated diverse data processing techniques through three case studies.
Conclusions:
- Macro-Raman mapping offers a powerful tool for comprehensive analysis of large cultural heritage items.
- The new setup enhances non-destructive molecular investigation of artworks.
- This technique provides unprecedented insights into the composition and degradation of large-scale artifacts.
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