Fiber Optics Reflectance Spectroscopy: A Non-destructive Technique for the Analysis of Works of Art

Picollo, Marcello; Bacci, Mauro; Casini, Andrea; Lotti, F.; Porcinai, Simone; Radicati, B.; Stefani, Lorenzo De

doi:10.1007/0-306-47099-3_23

Cited by 30 publications

(29 citation statements)

References 4 publications

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“…The goniospectrophotocolorimeter with optical fibers has been precisely described in a previous article, 4 and this configuration has begun to be used elsewhere. 5 The color of a plane object is mainly due to light scattered in its volume, characterized by the diffused reflectance spectrum R i (ie, normalized to a perfect diffuse reflector). If the surface becomes rough, the incident light is also randomly reflected in all directions, modifying the reflectance spectrum.…”

Section: Introductionmentioning

confidence: 99%

Color change due to surface state modification

Simonot

Elias

2002

Color Research & Application

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Section: Introductionmentioning

confidence: 99%

Color change due to surface state modification

Simonot

Elias

2002

Color Research & Application

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“…Indeed, this filter is centred at the reflectance maxima of malachite [30] and chrome green. Verdigris is another important copperbased pigment, with a reflectance maximum closer to the blue, at about 500 nm.…”

Section: Resultsmentioning

confidence: 99%

Multispectral imaging system using 12 interference filters for mapping pigments

Cosentino¹

2015

Cons. Património

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Multispectral imaging systems are used in art examination in order to map pigments and binders as well as retouches. This work presents a simple system composed of a monochromatic CCD camera and a set of only 12 interference filters characterized by different bandwidths and spacing throughout the covered electromagnetic spectrum (400-805 nm). The reasoning supporting the selection of these specific filters is discussed, as well as the results obtained on a collection of 54 historical pigments and on a series of 18 th century frescoes in Sicily. Generally, the filters set for similar systems are chosen equally spaced across the recorded spectrum. For this study the centre wavelength and the bandwidth of these filters have been chosen accordingly to the spectral features of historical pigments. This system allows only for a qualitative reconstruction of pigments reflectance spectra. It must be considered a valuable tool for segmenting the images of polychrome artworks and to identify areas of interest for further analytical examinations if more conclusive results are necessary. ResumoOs sistemas multiespectrais de imagem são utilizados na análise de obras de arte para mapear e identificar pigmentos e aglutinantes, bem como reintegrações cromáticas. Este trabalho apresenta um sistema simples composto por uma câmara CCD monocromática e um conjunto de apenas 12 filtros de interferência caracterizados por diferente espaçamento e largura das bandas ao longo do espectro electromagnético (400-805 nm). É justificada a selecção destes filtros e são discutidos os resultados obtidos quer com um conjunto de 54 pigmentos históricos quer com algumas pinturas a fresco, do século XVIII, da Sicília. De uma forma geral, os filtros usados em sistemas semelhantes são espaçados ao longo do espectro, mas, neste estudo, o comprimento de onda central e a largura da banda dos filtros foram seleccionados de modo a melhorar a representação das características espectrais dos pigmentos históricos. Este sistema permite apenas a reconstituição qualitativa dos espectros de reflectância. Deve ser considerado um instrumento útil para a segmentação de imagens de obras de arte polícromas e identificação de áreas de interesse para exame analítico mais detalhado se forem necessários resultados mais conclusivos. Article / Artigo

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“…1,2 In the same spectral range, emission spectroscopy, used in both steadystate and time-resolved mode, is another powerful technique able to provide information concerning fluorescent organic and inorganic materials used in artworks production. 3 Coupling kinetic analysis of the luminescence decay to the knowledge of spectral distribution of the emitted light allows different fluorophores with similar spectral properties to be distinguished.…”

Section: Introductionmentioning

confidence: 99%

New portable instrument for combined reflectance, time-resolved and steady-state luminescence measurements on works of art

et al. 2011

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In this paper a new compact and portable instrument for combined reflectance, time-resolved and steady-state fluorescence is presented. All the optical parts of the apparatus, carefully described in the text, were chosen after an extensive market survey in order to obtain the best performances coupled with the smallest dimensions. This instrument through the use of a dedicated multiple fiber optic probe, allows the complete photophysical behaviors of investigated materials to be collected from the same point of the analyzed surface. In this way, the resultant instrumental setup is a portable device, usable in situ for non destructive and non invasive diagnostic purposes in the field of cultural heritage. Preliminary results concerning organic dyes characterization, which is the main application of luminescence-based diagnostic techniques in artworks, are presented and compared with those previously obtained using separate devices. Concerning reflectance data, improvements in the deep detectable UV spectral range have been achieved switching from the integrating sphere of the old instrument to bifurcated optical fibers used as probe in the new one. Special attention was devoted to test the instrument capability in order to obtain the true emission spectrum, corrected for the selfabsorption effect, for which good results were found. This particular experimental procedure is strongly recommended, by a diagnostic point of view, to avoid distortions in the instrumental responses, namely the spectral shape and emission maximum wavelength of a fluorophore as function of the color saturation.

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Fiber Optics Reflectance Spectroscopy: A Non-destructive Technique for the Analysis of Works of Art

Cited by 30 publications

References 4 publications

Color change due to surface state modification

Color change due to surface state modification

Multispectral imaging system using 12 interference filters for mapping pigments

New portable instrument for combined reflectance, time-resolved and steady-state luminescence measurements on works of art

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