A. Claude Boccara,1 Yannick De Wilde,2,3 Hugo Bourdon,1 Jean-Marie Chassot1
1Institut Langevin Ondes et Images (France) 2Institut Langevin Ondes et Images, Ecole Supérieure de Physique et de Chimie Industrielles de la Ville de Paris, CNRS (France) 3Univ. PSL (France)
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We propose to record "en face" Full Field OCT interferometric images of paintings on canvas using a cooled MCT camera working in the range 3-5.5 micrometers coupled to a glowbar broadband source that allows to reach shot noise limited detection. Penetration in various paints is spectacular at these large wavelengths: we measure a mean free path 5 to 10 times larger than at visible/near IR wavelengths. We find that the canvas is easily observed under the paint. This result, obtained without averaging, paves the way to a non-contact, non-destructive, more detailed analysis of paintings than existing IR techniques.
A. Claude Boccara,Yannick De Wilde,Hugo Bourdon, andJean-Marie Chassot
"Non-destructive analysis of paintings by full field mid-IR tomography", Proc. SPIE PC12008, Photonic Instrumentation Engineering IX, PC1200808 (5 March 2022); https://doi.org/10.1117/12.2606201
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A. Claude Boccara, Yannick De Wilde, Hugo Bourdon, Jean-Marie Chassot, "Non-destructive analysis of paintings by full field mid-IR tomography," Proc. SPIE PC12008, Photonic Instrumentation Engineering IX, PC1200808 (5 March 2022); https://doi.org/10.1117/12.2606201