Abstract-Vis-NIR Hyperspectral and Terahertz Imaging Investigations on a Fresco Painting on “Tavella” by Alessandro Gherardini

A. Doria, G. P. Gallerano, E. Giovenale, A. Casini, C. Cucci, M. Picollo, M. Poggesi, L. Stefani, K. Fukunaga, M. Tamassia

http://link.springer.com/article/10.1007%2Fs10762-017-0357-2

In this paper, we report on Vis-IR hyperspectral and terahertz imaging investigations carried out on a fresco painting on tavella depicting St. John Baptist, by Alessandro Gherardini (1655–1726). Measurements took place at the Restoration Laboratories of the former “Polo Museale della Toscana,” in Florence, in the framework of the Italy-Japan collaborative project THz-ARTE. We show how the hyperspectral data made it possible to determine the state-of-conservation of Gherardini’s painting, while reflection imaging measurements performed at 97 GHz provided a qualitative evaluation of the position of defects inside the tavella.

Abstract-High power THz sources and applications at ENEA-Frascati

• G. P. Gallerano, 
• A. Doria, 
• E. Giovenale, 
• I. Spassovsky

http://link.springer.com/article/10.1007%2Fs10762-013-0046-8

ENEA has a long term expertise in the development of powerful short-pulse mm-wave and THz radiation sources driven by free electrons. Various electron-wave interaction schemes were successfully tested in the past, including Cerenkov and Smith-Purcell radiators as well as undulator devices. Two THz-FEL sources are currently available, covering altogether the spectral range from 90 GHz to 0.7 THz. Recently a novel Electro-Magnetic pulser, capable of providing both nanosecond THz electromagnetic (EM) radiation pulses and electrostatic (ES) pulses with identical time duration in one device has been designed and is currently under development. The pulser will allow, for the first time, direct comparison of EM and ES pulses on biological systems with peak electric fields that are significantly higher than any reported to date.