Non-destructive Testing by Infrared Thermography Under Random Excitation and ARMA Analysis

Bodnar, Jean-Luc; Candoré, J.C.; Detalle, Vincent

doi:10.1007/s10765-012-1265-2

Cited by 20 publications

(9 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, IRT does not reach the depth resolution of other techniques such as TTR and OCT, but it can inspect the support up to depth of several millimetres -a few centimetres in the case of wall paintings provided that a suitable excitation scheme is used. In addition, recent developments in IRT technique have increased its effectiveness for artworks inspection and reduced the risk of any alteration of the artworks due to the thermal stimulus [27][28]. In particular, the use of the so-called Pulse-Compression Thermography (PuCT) procedure combined with a pseudo-noise modulated heating stimuli demonstrated to be effective even with a very small increment in the sample surface's temperature (∼1°C) [29][30].…”

Section: Introductionmentioning

confidence: 99%

Multi-spectral and Thermography Imaging Techniques for the Investigation of a 15th Century Wall Painting

Ricci¹,

Laureti²,

Malekmohammadi³

et al. 2020

Preprint

View full text Add to dashboard Cite

When planning the restoration of an artwork, the good practice involves the evaluation of the item healthiness before starting the common operation of cleaning, consolidation, etc., possibly through non-invasive techniques that supply meaningful information about the whole item. Motivated by this need, a plethora of imaging techniques are used in cultural heritage diagnostic typically borrowed from other applications – e.g. medical diagnostics, nondestructive testing, etc., and then tailored for inspecting cultural heritage objects. In the inspection of a painting, hyper- and multi- spectral techniques are commonly used to analyze the outer layers (varnish, pictorial and drawing) while X-ray, tomography, and many other can be employed to investigate its inner structure. Although highly desirable, a single technique providing all the info about a painting is still not available, thus it is of great interest defining protocols that could optimally exploit the complementarities of a limited number of techniques. To this aim, the present paper shows the combined use of the Hypecolorimetric Multispectral Imaging (HMI) and that of the Pulse-Compression Thermography (PuCT) on a 15th century wall painting attributed to the Italian artist Antonio del Massaro, also known as Pastura, and representing the Madonna with the Child and the Saints Jerome and Francis. In particular, HMI is a multispectral imaging method working from the ultraviolet to the near infrared region, exploiting advanced processing based on artificial intelligence to define hypercolorimetric coordinates. Such approach guarantees a thorough analysis of the outer layers, underlining previous restorations, varnish alterations and allowing the pigments to be classified from a comparison with a large database. The PuCT method adopted here has been tailored for the specific needs of artworks’ inspection and it allows for a safe imaging of the multilayer structure of paintings, and hence the stratigraphy analysis, through a suitable processing of the time-domain thermal response. The capabilities and the complementarities of the two techniques, whose info can also be fused through postprocessing techniques, are illustrated in detail in this paper. A false-color imaging approach is also proposed to improve the readability and analysis of the thermography results.

show abstract

Section: Introductionmentioning

confidence: 99%

Multi-spectral and Thermography Imaging Techniques for the Investigation of a 15th Century Wall Painting

Ricci¹,

Laureti²,

Malekmohammadi³

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…In AT, the desired thermal contrast is achieved by applying an external heating stimulus over the SUT [13] by means of various different physical sources. Light sources are the most common, see for instance [14][15][16][17][18][19], the SUT's illuminated surface heats up and then the heat diffuses toward the inner side of the sample to restore thermal equilibrium [20]. Alternatively, other methods of excitation have been proposed and successfully applied such as Ultrasound Vibro-Thermography [21], Eddy-Current Pulsed Thermography (ECPT) [22] and Microwave Thermography [23].…”

Section: Introductionmentioning

confidence: 99%

New features for delamination depth evaluation in carbon fiber reinforced plastic materials using eddy current pulse-compression thermography

Tian

Malekmohammadi

et al. 2019

NDT & E International

View full text Add to dashboard Cite

The growing application of composite materials in aerospace leads to the urgent need of non-destructive testing and evaluation (NDT&E) techniques capable of detecting defects such as impact damage and delamination possibly existing in those materials. Eddy current pulsed thermography is an emerging non-destructive testing (NDT) technique capable of detecting such defects. However, the characterization of delamination within composite materials is difficult to be achieved by a single pulse excitation especially in carbon fiber reinforced plastic materials as the extraction of thermal diffusion in such multi-layered structures is challenging. To cope with this problem, this paper proposes the eddy current pulsecompression thermography (ECPuCT) combining the Barker code modulated eddy current excitation and pulse-compression technique to enhance the capability of characterizing delamination on carbon fiber reinforced plastic materials. Additionally, a thermal pattern enhanced method based on kernel principal component analysis technique is used to locate the delaminated areas. Two features, including a newly proposed crossing point of impulse responses related to defective and non-defective areas and skewness of impulse responses are investigated for delamination depth evaluation. Results show that delamination can be detected within depths ranging from 0.46 mm to 2.30 mm and both the proposed features have a monotonic relationship with delamination depths.

show abstract

“…These three laboratories have worked together for over 10 years. This collaboration has already shown, using stimulated infrared thermography, the possibility to detect delamination located in heritage murals paintings (painted walls of the church of "Saint Florentin" in "Bonnet", painted ceilings of the Abbey of "Saint Savin sur Gartempe" -World Heritage of UNESCO ...) [39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54]. However, one of the problems encountered during this collaboration was the variable sensitivity of the pictorial layer according to the excitation flux.…”

Section: Introductionmentioning

confidence: 99%

Non-destructive testing of works of art by stimulated by infrared thermography: PPT interest

Mouhoubi¹,

Bodnar²,

Detalle³

et al. 2016

Proceedings of the 2016 International Conference on Quantitative InfraRed Thermography

Self Cite

View full text Add to dashboard Cite

Short abstractWithin the framework of the cultural heritage conservation, stimulated infrared thermography has already demonstrated its efficiency. However, sometimes, the different colors of the paint layer can lead to artifacts of detection. In this work, we show theoretically and experimentally that the combination of a PPT analysis and of the stimulated infrared thermography allows a significant reduction of this disturbing optical effect.

show abstract

Non-destructive Testing by Infrared Thermography Under Random Excitation and ARMA Analysis

Cited by 20 publications

References 6 publications

Multi-spectral and Thermography Imaging Techniques for the Investigation of a 15th Century Wall Painting

Multi-spectral and Thermography Imaging Techniques for the Investigation of a 15th Century Wall Painting

New features for delamination depth evaluation in carbon fiber reinforced plastic materials using eddy current pulse-compression thermography

Non-destructive testing of works of art by stimulated by infrared thermography: PPT interest

Contact Info

Product

Resources

About