Data di Pubblicazione:
2017
Citazione:
A new spherical scanning system for infrared reflectography of paintings / M. Gargano, F. Cavaliere, D. Viganò, A. Galli, N. Ludwig. - In: INFRARED PHYSICS & TECHNOLOGY. - ISSN 1350-4495. - 81(2017 Mar), pp. 128-136.
Abstract:
Infrared reflectography is an imaging technique used to visualize the underdrawings of ancient paintings;
it relies on the fact that most pigment layers are quite transparent to infrared radiation in the spectral
band between 0.8 lm and 2.5 lm. InGaAs sensor cameras are nowadays the most used devices to visualize
the underdrawings but due to the small size of the detectors, these cameras are usually mounted on
scanning systems to record high resolution reflectograms. This work describes a portable scanning system
prototype based on a peculiar spherical scanning system built through a light weight and low cost
motorized head. The motorized head was built with the purpose of allowing the refocusing adjustment
needed to compensate the variable camera-painting distance during the rotation of the camera. The prototype
has been tested first in laboratory and then in-situ for the Giotto panel ‘‘God the Father with
Angels” with a 256 pixel per inch resolution. The system performance is comparable with that of other
reflectographic devices with the advantage of extending the scanned area up to 1 m 1 m, with a
40 min scanning time. The present configuration can be easily modified to increase the resolution up
to 560 pixels per inch or to extend the scanned area up to 2 m x 2m.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Infrared reflectography; Spherical scanning; Infrared scanner; Underdrawings; InGaAs camera; Giotto underdrawing
Elenco autori:
M. Gargano, F. Cavaliere, D. Viganò, A. Galli, N. Ludwig
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