Abstract
<p>Laser Induced Fluorescence (LIF) is a well-recognized spectroscopic technique in cultural heritage for non-destructive surface chemical<br />analysis. It is particularly suitable for in situ analysis on delicate targets as artworks, because it does not need any sample preparation<br />nor contact, working remotely also where only optical access is available. Recently ENEA has developed two LIF prototypes with<br />multispectral (Forlab) and hyperspectral (Lifart) scanning systems, that return different typologies of results, making them necessary<br />and dependent each other. In fact, Forlab permits by its motorized optics the rapid acquisition of fluorescence maps and images of large<br />surfaces in specific spectral wavelengths, while Lifart returns complete fluorescence spectra, giving a complete spectral information of<br />an object. In this paper the intercalibration of two systems is reported, with the data analysis of calibration samples and a software to<br />automatically correct imaging data, that take into account Forlab filters bandpasses and optical efficiencies, in order to make these two<br />configurations as much as possible comparable. The new correcting algorithm was also tested on LIF measurements carried out on an<br />Egyptian casket and sarcophagus, obtaining higher quality fluorescence images.</p>
Highlights
Over the last decades, spectral imaging technology, which was previously restricted to astrophysics, remote sensing and military applications [1], has been employed in cultural heritage, thanks to the development of infrared reflectography in the study of paintings [2], [3]
Laser-induced fluorescence (LIF) is a well-recognised spectroscopic technique used in cultural heritage for non-destructive surface chemical analysis
ENEA has developed LIF prototypes with hyperspectral (Lifart) [27] and multispectral (Forlab) [28] scanning systems that are capable of both fluorescence and reflectance imaging
Summary
Spectral imaging technology, which was previously restricted to astrophysics, remote sensing and military applications [1], has been employed in cultural heritage, thanks to the development of infrared reflectography in the study of paintings [2], [3]. ENEA has developed LIF prototypes with hyperspectral (Lifart) [27] and multispectral (Forlab) [28] scanning systems that are capable of both fluorescence and reflectance imaging. They return different types of spatial and spectral information, making them necessary for and dependent on each other. The two LIF systems described here are innovative prototypes, designed for remote (entailing a distance up to some tens of meters) cultural heritage investigations They possess complementary features for the fast and accurate characterisation of both large and small artworks thanks to their different configurations. Active reflectance measurements are based on elastic backscattering of the incident light collected from the analysed surface in daylight or under a specific white light source
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