NDT inspection of plastered mosaics by means of transient thermography and holographic interferometry

Theodorakeas, Panagiotis; Ibarra-Castanedo, Clemente; Сфарра, Стефано; Avdelidis, Nicolas P.; Koui, Maria; Maldague, Xavier; Paoletti, Domenica; Ambrosini, Dario

doi:10.1016/j.ndteint.2012.01.004

Cited by 38 publications

(24 citation statements)

References 23 publications

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“…Active thermography is widely used in aerospace nonde− structive testing (NDT) [27] and is constantly finding new applications, one of which is the inspection of cultural heri− tage objects and artworks [28][29][30]. As previously mentio− ned, the Madonna specimen [ Fig.…”

Section: Subsurface Imaging For Panel Paintings Inspectionmentioning

confidence: 99%

Subsurface imaging for panel paintings inspection: A comparative study of the ultraviolet, the visible, the infrared and the terahertz spectra

Bendada

Сфарра

Ibarra-Castanedo

et al. 2015

Opto-Electronics Review

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Infrared (IR) reflectography has been used for many years for the detection of underdrawings on panel paintings. Advances in the fields of IR sensors and optics have impelled the wide spread use of IR reflectography by several recognized Art Museums and specialized laboratories around the World. The transparency or opacity of a painting is the result of a complex combination of the optical properties of the painting pigments and the underdrawing material, as well as the type of illumination source and the sensor characteristics. For this reason, recent researches have been directed towards the study of multispectral approaches that could provide simultaneous and complementary information of an artwork. The present work relies on non−simultaneous multispectral inspection using a set of detectors covering from the ultraviolet to the terahertz spectra. It is observed that underdrawings contrast increases with wavelength up to 1700 nm and, then, gradually decreases. In addition, it is shown that IR thermography, i.e., temperature maps or thermograms, could be used simultaneously as an alternative technique for the detection of underdrawings besides the detection of subsurface defects.

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Section: Subsurface Imaging For Panel Paintings Inspectionmentioning

confidence: 99%

Subsurface imaging for panel paintings inspection: A comparative study of the ultraviolet, the visible, the infrared and the terahertz spectra

Bendada

Сфарра

Ibarra-Castanedo

et al. 2015

Opto-Electronics Review

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“…In particular, the first one explores in-depth the object to be analyzed, while the second one provides a more superficial evaluation of the state of conservation. On this research field, some experiences have been done in the diagnostics of frescoes [21], panel paintings [22], mosaics [23], marquetries [24], painting on canvas [25] and wooden statues [26]. Therefore, the idea to reproduce the integrated approach also in the case of ancient book bindings naturally set off.…”

Section: Introductionmentioning

confidence: 99%

Detection of incipient defects in book bindings. A functional use of the infrared vision combined with optical and nuclear magnetic resonance (NMR) spectroscopy techniques

Сфарра¹,

Tortora²,

Regi³

et al. 2016

Proceedings of the 2016 International Conference on Quantitative InfraRed Thermography

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In this study, an ancient book dating back 1822 was inspected by infrared thermography method, working in the active modality. Data was processed by different techniques in order to reduce the impact of non-uniform heating and, in the same time, to improve the thermal imprint of the natural defects detected. In order to confirm the results obtained, both the holographic interferometry and the nuclear magnetic resonance (NMR) techniques were used. The results appear in good agreement among them. Finally, the book binding was also studied into the near-infrared spectrum, while the lateral hinge was inspected by speckle techniques.

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“…In order to estimate at a quantitative level subsurface anomalies, it is necessary to apply advanced algorithms to the raw curves [9,10]; in this way, it is possible to gather information, such as depth and dimensions of the subsurface anomalies [11,12] and, in some cases, also their nature [13,14].…”

Section: Introductionmentioning

confidence: 99%

Ceramics and defects

Сфарра

Perilli

Paoletti

et al. 2015

J Therm Anal Calorim

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The feasibility of square-pulsed thermography nondestructive testing for the detection of defects in one ceramic material sample has been carried out by finite element (FE) analysis. In particular, a ceramic plate containing defects of different diameters, depths, locations, nature, and shapes has been numerically investigated by means of Comsol Ò Multiphysics computer program, taking into account the results coming from both a MATLAB TM script and the infrared thermography (IRT) technique. Indeed, the FE method simulates through a 3D model the heat transfer process induced into the ceramic material by two halogen lamps that have been applied in order to provoke an optimum thermal stress. Moreover, further defects like cracks arose beneath the surface of the plate due to the shrinkage process, have been discovered, and contrasted using a non-usual segmentation algorithm that when correlated in the time to IRT data simulates the thermo-elastic effect. Following the non-direct procedure proposed, both the depth of each defect and its main dimensions have been retrieved into a satisfactory accuracy.

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NDT inspection of plastered mosaics by means of transient thermography and holographic interferometry

Cited by 38 publications

References 23 publications

Subsurface imaging for panel paintings inspection: A comparative study of the ultraviolet, the visible, the infrared and the terahertz spectra

Subsurface imaging for panel paintings inspection: A comparative study of the ultraviolet, the visible, the infrared and the terahertz spectra

Detection of incipient defects in book bindings. A functional use of the infrared vision combined with optical and nuclear magnetic resonance (NMR) spectroscopy techniques

Ceramics and defects

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