Analysis of a seventeenth-century panel painting by reflection terahertz time-domain imaging (THz-TDI): contribution of ultrafast optics to museum collections inspection

Dandolo, Corinna Ludovica Koch; Filtenborg, Troels; Skou-Hansen, Jacob; Jepsen, Peter Uhd

doi:10.1007/s00339-015-9303-0

Cited by 19 publications

(9 citation statements)

References 17 publications

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“…Terahertz images from features at a specific interface within a stratified object can be obtained by identifying the pulse corresponding to the layer of interest in the reflected waveform, and producing a map of its amplitude throughout the scanned area [59][60][61][62]. For a layer of ink applied on a support 80 to 300 μm thick, two to three interfaces may be considered, depending on the thickness of the ink layer and penetration of the ink into the fibres of the support: the air-ink interface, the inkfront surface of the support interface and the back surface of the support-air interface.…”

Section: Signal Processingmentioning

confidence: 99%

Contrast in Terahertz Images of Archival Documents—Part I: Influence of the Optical Parameters from the Ink and Support

Bardon¹,

May

Jackson

et al. 2017

J Infrared Milli Terahz Waves

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This study aims to objectively inform curators when terahertz time-domain (TD) imaging set in reflection mode is likely to give well-contrasted images of inscriptions in a complex archival document and is a useful non-invasive alternative to current digitisation processes. To this end, the dispersive refractive indices and absorption coefficients from various archival materials are assessed and their influence on contrast in terahertz images from historical documents is explored. Sepia ink and inks produced with bistre or verdigris mixed with a solution of Arabic gum or rabbit skin glue are unlikely to lead to well-contrasted images. However, dispersions of bone black, ivory black, iron gall ink, malachite, lapis lazuli, minium and vermilion are likely to lead to well-contrasted images. Inscriptions written with lamp black, carbon black and graphite give the best imaging results. The characteristic spectral signatures from iron gall ink, minium and vermilion pellets between 5 and 100 cm −1 relate to a ringing effect at late collection times in TD waveforms transmitted through these pellets. The same ringing effect can be probed in waveforms reflected from iron gall, minium and vermilion ink deposits at the surface of a document. Since TD waveforms collected for each scanning pixel can be Fourier

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Section: Signal Processingmentioning

confidence: 99%

Contrast in Terahertz Images of Archival Documents—Part I: Influence of the Optical Parameters from the Ink and Support

Bardon¹,

May

Jackson

et al. 2017

J Infrared Milli Terahz Waves

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“…In recent years, THz imaging has shown great potential in the cultural-heritage arena, enabling the characterization of features in stone sculpture and in architecture [2], wooden objects [3] and tree rings [4], clay artifacts [5], written papyrus [6], and even ancient Egyptian mummies [7,8]. Within the area of art paintings, THz imaging has been utilized to identify features hidden under the surface of a painting, such as the artist's signature [9], under-drawings and modifications due to the reuse of an earlier painting or canvas [10][11][12][13]. In addition to revealing such subsurface features, the stratigraphic structure of art paintings is of general interest, since it may be used to understand the process of the painting's creation.…”

Section: Introductionmentioning

confidence: 99%

Terahertz frequency-wavelet domain deconvolution for stratigraphic and subsurface investigation of art painting

Dong¹,

Jackson²,

Melis³

et al. 2016

Opt. Express

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Terahertz frequency-wavelet deconvolution is utilized specifically for the stratigraphic and subsurface investigation of art paintings with terahertz reflective imaging. In order to resolve the optically thin paint layers, a deconvolution technique is enhanced by the combination of frequency-domain filtering and stationary wavelet shrinkage, and applied to investigate a mid-20th century Italian oil painting on paperboard, After Fishing, by Ausonio Tanda. Based on the deconvolved terahertz data, the stratigraphy of the painting including the paint layers is reconstructed and subsurface features are clearly revealed, demonstrating that terahertz frequency-wavelet deconvolution can be an effective tool to characterize stratified systems with optically thin layers.

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“…This is useful in describing the local panel construction technique in use at the time, but also in placing this information in relation to conservation purposes, since it is related to the structural stability of the support and to the possible degradation effects, which it may have on the surface painting layers [9,12]. THz-TDI scanning can provide information about defects, such as leavage and layer detachment, delaminations, insect damage, wormholes, cracks, knots, and other type of imperfections.…”

mentioning

confidence: 99%

“…The possibility of obtaining stratigraphic information noninvasively [1][2][3] within a large portion of a panel painting led to considering THz-TDI as a suitable technique to give insight into the construction technique of panel paintings, which is closely connected to the provenance, age, and attribution of the paintings [4][5][6][7][8][9][10][11].…”

mentioning

confidence: 99%

Fra Angelico’s painting technique revealed by terahertz time-domain imaging (THz-TDI)

et al. 2016

Self Cite

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We have investigated with terahertz time-domain imaging (THz-TDI) the well-known Lamentation over the dead Christ panel painting (San Marco Museum, Florence) painted by Fra Giovanni Angelico within 1436 and 1441. The investigation provided a better understanding of the construction and gilding technique used by the eminent artist, as well as the plastering technique used during the nineteenth-century restoration intervention. The evidence obtained from THz-TDI scans was correlated with the available documentation on the preservation history of the art piece. Erosion and damages documented for the wooden support, especially in the lower margin, found confirmation in the THz-TD images.

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Analysis of a seventeenth-century panel painting by reflection terahertz time-domain imaging (THz-TDI): contribution of ultrafast optics to museum collections inspection

Cited by 19 publications

References 17 publications

Contrast in Terahertz Images of Archival Documents—Part I: Influence of the Optical Parameters from the Ink and Support

Contrast in Terahertz Images of Archival Documents—Part I: Influence of the Optical Parameters from the Ink and Support

Terahertz frequency-wavelet domain deconvolution for stratigraphic and subsurface investigation of art painting

Fra Angelico’s painting technique revealed by terahertz time-domain imaging (THz-TDI)

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