Pulsed thermography has proven to be a useful tool to detect subsurface features in ancient bookbindings and, in particular, to provide the IR image of texts buried beneath the end - leaves of the books. In this paper the theory is presented to analyze the influence of the geometrical and physical parameters involved in the processes leading to the distortion in the IR image of the detected buried graphical features. The distortion is mainly due to the lateral diffusion of the heat generated at the ink feature after the absorption of an excitation light. A comprehensive analysis taking into account the three dimensional heat diffusion process, in an optically semi-transparent medium, is considered. Numerical results are reported showing the behavior of the contrast and of a distortion parameter of the buried inked feature detected by the IR imaging in the various considered cases.

Caruso, G., Mercuri, F., Zammit, U., Paoloni, S., Ceccarelli, S., & Orazi, N. (2021). 3D heat flow effects in the imaging of subsurface graphical features in semi-transparent media by pulsed thermography. MEASUREMENT, 185 [10.1016/j.measurement.2021.110111].

3D heat flow effects in the imaging of subsurface graphical features in semi-transparent media by pulsed thermography

Mercuri F.;Zammit U.;Paoloni S.;Orazi N.
2021

Abstract

Pulsed thermography has proven to be a useful tool to detect subsurface features in ancient bookbindings and, in particular, to provide the IR image of texts buried beneath the end - leaves of the books. In this paper the theory is presented to analyze the influence of the geometrical and physical parameters involved in the processes leading to the distortion in the IR image of the detected buried graphical features. The distortion is mainly due to the lateral diffusion of the heat generated at the ink feature after the absorption of an excitation light. A comprehensive analysis taking into account the three dimensional heat diffusion process, in an optically semi-transparent medium, is considered. Numerical results are reported showing the behavior of the contrast and of a distortion parameter of the buried inked feature detected by the IR imaging in the various considered cases.
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/07
English
3D heat diffusion
Hidden graphic elements
Hidden texts
Infrared Thermography
Optically semi-transparent materials
https://reader.elsevier.com/reader/sd/pii/S0263224121010320?token=56252EE6DCE05FFC42D381407722925891332719BCFF39CA22B78BD9A8C04DF7646405439503231DBC7145A562A61FF4&originRegion=eu-west-1&originCreation=20220322151107
Caruso, G., Mercuri, F., Zammit, U., Paoloni, S., Ceccarelli, S., & Orazi, N. (2021). 3D heat flow effects in the imaging of subsurface graphical features in semi-transparent media by pulsed thermography. MEASUREMENT, 185 [10.1016/j.measurement.2021.110111].
Caruso, G; Mercuri, F; Zammit, U; Paoloni, S; Ceccarelli, S; Orazi, N
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/291843
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