30 May 2013 Mid-infrared hyperspectral imaging of painting materials
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A novel hyperspectral imaging system (HI90, Bruker Optics), working in the mid-infrared range and recently developed for the remote identification and mapping of hazardous compounds, has here been optimized for investigating painting surfaces. The painting Sestante 10 (1982) by Alberto Burri has been spectrally and spatially investigated with the HI90 system revealing the distribution of inorganic materials constituting the artworks. In order to validate the results obtainable by the imager for the pigment identification previous tests on laboratory models were performed. Yellow, white and blue pigments painted with different binders (namely egg, alkyd, acrylic and vinyl) were investigated by the HI90. Afterwards, the polychrome painting Sestante 10 was investigated focusing the attention on the inorganic material distribution revealing the presence of different extenders (kaolin, BaSO4, CaSO4) mixed with the various silica-based pigments present in the painting. The brightness temperature spectra collected by HI90 have also been compared to single point reflection spectra acquired by a conventional portable FTIR spectrometer (Alpha-R by Bruker Optics) highlighting the good spectral quality of the imaging system. This comparison permitted also to evaluate the spectral response and the diagnostic strengths of the spectral range available by the HI90 imaging (1300-860 cm-1), validating the reliability of the obtained chemical images. This study clearly highlights the high potential of the new hyperspectral imaging system and opens up new perspectives in the current scientific interest devoted to the application of mapping and imaging methods for the study of painting surfaces.
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Francesca Rosi, Francesca Rosi, Roland Harig, Roland Harig, Costanza Miliani, Costanza Miliani, René Braun, René Braun, Diego Sali, Diego Sali, Alessia Daveri, Alessia Daveri, Brunetto G. Brunetti, Brunetto G. Brunetti, Antonio Sgamellotti, Antonio Sgamellotti, } "Mid-infrared hyperspectral imaging of painting materials", Proc. SPIE 8790, Optics for Arts, Architecture, and Archaeology IV, 87900Q (30 May 2013); doi: 10.1117/12.2020477; https://doi.org/10.1117/12.2020477

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