Summary
This chapter describes a portable apparatus for the non-invasive examination of paintings based on a lead sulphide vidicon camera that works in the 400–2000 nm range. Imaging spectroscopy is achieved by collecting a multi-wavelength sequence of near-monochromatic images in the investigated area. After amplitude normalization and geometrical registration, the reflectance spectra can be reconstructed. Pigment identification may be made by comparing these spectra with those of a database of reference pigments and paintings. More detailed investigations on the pigment layers are afforded by appropriate algorithms, which supply distribution maps that can easily be correlated with the visual aspect of the painting. Examples of applications on test objects and on a XVI century Italian painting are reported. A brief review is also given of the modern infrared solid-state cameras that are most suited to replace the noisy and instable lead sulphide vidicon cameras in these applications.
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Casini, A., Lotti, F., Picollo, M. (1999). Imaging Spectroscopy for the Non-invasive Investigation of Paintings. In: Asakura, T. (eds) International Trends in Optics and Photonics. Springer Series in OPTICAL SCIENCES, vol 74. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-48886-6_22
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DOI: https://doi.org/10.1007/978-3-540-48886-6_22
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