Hyperspectral image analysis (HIA) is a potential tool for obtaining many spectral information in the visible and near infrared region with a series of narrow and contiguous wavelength bands, permitting to discriminate materials on the basis of their different patterns of absorption at specific wavelengths. This technique, widely used for determining the characteristics and properties of soils, air and water in a rapid, simultaneous and non-destructive way, has been recently proposed as a non-invasive method for in situ analyses of artworks (Vettori et al 2008, Camaiti et al. in press). A portable high-resolution spectroradiometer (a special kind of spectrometer that can measure radiant energy), ASD FieldSpec FR Pro, is a compact, field portable and precision instrument designed to acquire Visible and Near-Infrared (VNIR: 350–1000 nm) and Short-Wave Infrared (SWIR: 1000–2500 nm) punctual reflectance spectra with a rapid data collection time (about 0.1 s for each spectrum). The ASD-FieldSpec FR Pro spectroradiometer can acquire spectra using the contact reflectance probe employing an artificial internal light source with a spot analysis of about 1.5 cm2. Since the spectral fingerprints of a number of mineralogical phases fall within the spectral range covered by ASD-FieldSpec FR Pro, like calcite and gypsum. In collaboration with Opificio delle Pietre Dure of Florence, the spectroradiometer has been employed for selecting the best cleaning procedure on a marble column belonging to the Loggia di Baccio D’Agnolo of Florence Cathedral. The column was originally heavily affected by sulphation and the superficial gypsum layer showed a good adhesion to the underlying patina; in this situation a not controlled gypsum removal may cause the damage of the original surface (over cleaning). Our results on the marble column indicate differences in the cleaning efficacy depending on the methodology adopted. These results point out that portable hyperspectral instruments may be powerful tools for characterizing historical surfaces in a non-destructive and non-invasive way.
An application of portable hyperspectral sensor to Cultural Heritage / Vettori S.; Benvenuti M.; Camaiti M.; Costagliola P.; Moretti S.; Pecchioni E.. - In: EPITOME. - ISSN 1972-1552. - STAMPA. - 4:(2011), pp. 333-333.
An application of portable hyperspectral sensor to Cultural Heritage
BENVENUTI, MARCO;COSTAGLIOLA, PILARIO;MORETTI, SANDRO;PECCHIONI, ELENA
2011
Abstract
Hyperspectral image analysis (HIA) is a potential tool for obtaining many spectral information in the visible and near infrared region with a series of narrow and contiguous wavelength bands, permitting to discriminate materials on the basis of their different patterns of absorption at specific wavelengths. This technique, widely used for determining the characteristics and properties of soils, air and water in a rapid, simultaneous and non-destructive way, has been recently proposed as a non-invasive method for in situ analyses of artworks (Vettori et al 2008, Camaiti et al. in press). A portable high-resolution spectroradiometer (a special kind of spectrometer that can measure radiant energy), ASD FieldSpec FR Pro, is a compact, field portable and precision instrument designed to acquire Visible and Near-Infrared (VNIR: 350–1000 nm) and Short-Wave Infrared (SWIR: 1000–2500 nm) punctual reflectance spectra with a rapid data collection time (about 0.1 s for each spectrum). The ASD-FieldSpec FR Pro spectroradiometer can acquire spectra using the contact reflectance probe employing an artificial internal light source with a spot analysis of about 1.5 cm2. Since the spectral fingerprints of a number of mineralogical phases fall within the spectral range covered by ASD-FieldSpec FR Pro, like calcite and gypsum. In collaboration with Opificio delle Pietre Dure of Florence, the spectroradiometer has been employed for selecting the best cleaning procedure on a marble column belonging to the Loggia di Baccio D’Agnolo of Florence Cathedral. The column was originally heavily affected by sulphation and the superficial gypsum layer showed a good adhesion to the underlying patina; in this situation a not controlled gypsum removal may cause the damage of the original surface (over cleaning). Our results on the marble column indicate differences in the cleaning efficacy depending on the methodology adopted. These results point out that portable hyperspectral instruments may be powerful tools for characterizing historical surfaces in a non-destructive and non-invasive way.
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