Integration study among flying spot laser thermography and terahertz technique for the inspection of panel paintings

Сфарра, Стефано; Gavérina, Ludovic; Pradère, Christophe; Sommier, Alain; Batsale, Jean‐Christophe

doi:10.1007/s10973-021-11181-8

Cited by 3 publications

(2 citation statements)

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“…The thermochromic effect constitutes a potential secondary damage while using IRT. Two ways can be used to avoid the thermochromic effect: (1) minimizing the input energy [20,21], and/or (2) performing ad hoc numerical modeling to help obtain quantitative and reproducible results, so as to guide and optimize the procedure for testing the actual subjects [22][23][24][25]. The present work takes the second option.…”

Section: Introductionmentioning

confidence: 99%

“…The present work takes the second option. Numerical simulation constitutes an effective means to test and optimize the design of IRT systems [20,24,25], as it is not only able to mimic the experimental environment but also able to predict the experimental result. In addition, it can contribute to understanding the physical mechanism of heat transfer and radiation in the complex materials and structures, which is vital to IRT.…”

Section: Introductionmentioning

confidence: 99%

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Simulation-aided infrared thermography with decomposition-based noise reduction for detecting defects in ancient polyptychs

Jiang,

Wang,

et al. 2023

Herit Sci

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In recent years, the conservation and protection of ancient cultural heritage have received increasing attention, and non-destructive testing (NDT), which can minimize the damage done to the test subject, plays an integral role therein. For instance, NDT through active infrared thermal imaging can be applied to ancient polyptychs, which can realize accurate detection of damage and defects existing on the surface and interior of the polyptychs. In this study, infrared thermography is used for non-invasive investigation and evaluation of two polyptych samples with different pigments and artificial defects, but both reproduced based on a painting by Pietro Lorenzetti (1280/85–1348) using the typical tempera technique of the century. It is noted that, to avoid as far as possible secondary damages done to the ancient cultural heritages, repeated damage-detection experiments are rarely carried out on the test subjects. To that end, numerical simulation is used to reveal the heat transfer properties and temperature distributions, as to perform procedural verification and reduce the number of experiments that need to be conducted on actual samples. Technique-wise, to improve the observability of the experimental results, a total variation regularized low-rank tensor decomposition algorithm is implemented to reduce the background noise and improve the contrast of the images. Furthermore, the efficacy of image processing is quantified through the structural-similarity evaluation.

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