Nonlinear imaging and THz diagnostic tools in the service of Cultural Heritage

Filippidis, George; Massaouti, Maria; Selimis, Alexandros; Gualda, Emilio J.; Manceau, Jean‐Michel; Tzortzakis, S.

doi:10.1007/s00339-011-6691-7

Cited by 38 publications

(25 citation statements)

References 29 publications

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“…Spectral databases for THz radiation large enough to allow for a reliable identification of unknown compounds are still missing, but are in development [155]. Recently, THz spectroscopy has been proposed as a suitable tool for the study coal tar dyes [9].…”

Section: Terahertz Imagingmentioning

confidence: 99%

“…Further, we omit techniques that are only sensitive to the surface of paintings, such as multi-spectral imaging in the visible range [7] and Raman imaging [8]. Nonlinear imaging [9] is omitted, as currently too few case studies are available that allow to estimate the practical value of this technique for the investigation of hidden features in historical paintings.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mobile depth profiling and sub-surface imaging techniques for historical paintings—A review

Alfeld

Broekaert

2013

Spectrochimica Acta Part B: Atomic Spectroscopy

114

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Section: Terahertz Imagingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mobile depth profiling and sub-surface imaging techniques for historical paintings—A review

Alfeld

Broekaert

2013

Spectrochimica Acta Part B: Atomic Spectroscopy

114

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“…Terahertz time domain spectroscopy (THz-TDS) has been applied in a wide range of research fields, such as biological molecules identification, materials investigation, explosives inspection, and medicine analysis (Liu et al, 2012;Jin et al, 2010). In the cultural heritage aspect (Jackson et al, 2011), THz-TDS has been applied to analyze the major components of painting (Filippidis et al, 2013;Manceau et al, 2008), THz-TDS imaging for mural paintings and hidden paint layers on canvas (Jackson et al, 2008;Adam et al, 2009;Walker et al, 2013), and THz spectra for relative materials of cultural relics (Fukunaga and Picolio, 2010;Todoruk et al, 2008). Compared with other approaches, THz-TDS is a non-destructive, non-ionizing, and high sensitivity efficient detection technique.…”

Section: Introductionmentioning

confidence: 99%

THz spectra-based SVM prediction model for Yungang Grottoes samples

Meng

Zheng

et al. 2015

Journal of Archaeological Science

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“…SHG enables the detection of high degree-organized structures without inversion symmetry, such as stacked membranes and arranged proteins (e.g. collagens), for the visualisation of wood microstructure, specifically crystalline cellulose [2,3]. On the other hand, THG allows to resolve transparent interfaces, on the basis of local differences in refractive index and dispersion [8].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear optical imaging techniques (NLO) for painting investigation

Fovo¹,

Fontana²,

Striová³

et al. 2017

Proceedings of the International Conference LACONA XI

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Nonlinear optical imaging techniques (NLO imaging), i.e. multiphoton excitation fluorescence (MPEF), second and third harmonic generation (SHG, THG), are high-resolution imaging modalities which may provide non-destructive determination of thickness and composition within multi-layer objects as a function of depth. NLO techniques have been recently introduced into artworks analyses, giving promising results. As regards paintings, the guiding idea is to exploit the low absorption in the near-infrared (NIR) of most materials, using a laser light in this spectral region which may generate non-linear interactions within materials. The objective is to make feasible the in-depth profiling of thin films on the basis of refractive index changes, variation of optical activity and presence of fluorophores. Such information is definitely useful for the analysis of painted objects and can be also crucial for the monitoring of restoring operations. In this study, we present the preliminary results obtained through the application of NLO imaging techniques on a series of single-and multi-layers systems simulating real egg-tempera wood panel paintings. This research is part of the wider Iperion CH Project, whose WP6 entails the evaluation of NLO-imaging to obtain highly resolved en-face and 3D images of small areas on paintings. To that purpose, a set of multi-layer painted samples, simulating real paintings, was designed and realized. They are currently under analysis with different operating systems and modalities within the partnership. In order to assess the reliability of NLO measurements, data were complemented with other well-established techniques, such as Fourier Transform Infrared Spectroscopy (FTIR) and X-Ray Fluorescence (XRF) for the chemical characterization of materials, Optical Coherence Tomography (OCT) for the determination of layers thickness and laser scanning micro-profilometry for the study of surface morphology. In addition, colorimetric analyses, i.e. reflectance spectroscopy in the visible region, were performed in order to chromatically characterize pigments and lakes. Finally, the transparency of the different materials was investigated by means of Scanning Multispectral VIS-NIR Reflectography. The preliminary results suggest that the 740 nm wavelength, while enabling the visualization of the painting surfaces micromorphology, is not effective for the determination of thickness through the detection of the non-linear signals.

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Nonlinear imaging and THz diagnostic tools in the service of Cultural Heritage

Cited by 38 publications

References 29 publications

Mobile depth profiling and sub-surface imaging techniques for historical paintings—A review

Mobile depth profiling and sub-surface imaging techniques for historical paintings—A review

THz spectra-based SVM prediction model for Yungang Grottoes samples

Nonlinear optical imaging techniques (NLO) for painting investigation

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