Automatic defect detection from thermographic non destructive testing

Dinardo, Giuseppe; Fabbiano, Laura; Tamborrino, R.; Vacca, Gaetano

doi:10.1088/1742-6596/1249/1/012010

Cited by 5 publications

(6 citation statements)

References 10 publications

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“…In this case, M is equal to 2 replicated measurements, where the number of repeated measures N is equal to 32 for each replicated measurement process. The evaluated intermediate precision in (6) is equal to 0.047 °C. This value shows as the replication of a measurement process on the same measurand after some time is inevitably affected by uncertainty which is greater than the repeatability contribution.…”

Section: Fig 3 Thermography Images Of Lamp Detailsmentioning

confidence: 99%

Evaluation of Intermediate Precision in Thermographic Measurements for Monitoring the Conservation State of Metallic Discoveries

Morello¹,

Capua²,

Fabbiano³

2023

Proceedings of the 2022 IMEKO TC4 International Conference on Metrology for Archaeology and Cultural Heritage

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This paper deals with the metrological issue of the reliability in measurements. The evaluation of intermediate precision is discussed to assure repeatable data over time. As an example, the monitoring process of archaeological or historic discoveries needs that data coming from different measurements and performed in different time instants are comparable and traceable. Thermography is used here to evaluate the conservation state of metallic artefacts and their decay over time. Data on the integrity of an ancient iron oil lamp have been collected at different points in time. Intermediate precision has been computed to evaluate the data reliability so to guarantee the comparability of data. The proposed approach can allow getting accurate and consistent information on the discovery decay over time. Intermediate precision evaluation provides quantitative information about the effectiveness of the monitoring process and the reliability of its results.

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Section: Fig 3 Thermography Images Of Lamp Detailsmentioning

confidence: 99%

Evaluation of Intermediate Precision in Thermographic Measurements for Monitoring the Conservation State of Metallic Discoveries

Morello¹,

Capua²,

Fabbiano³

2023

Proceedings of the 2022 IMEKO TC4 International Conference on Metrology for Archaeology and Cultural Heritage

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“…The specimens used are three discs (diameter 25 mm and thickness 5 mm), with metallic bondcoat and a ceramic topcoat (thickness 200 µm) which is yttria stabilized zirconia (YSZ), deposited with the high velocity oxy fuel (HVOF) technique. The specimens, developed and exploited by the same authors in [18], have been realized keeping the same thickness of the substrate and of the TBC coating, but with an adhesion defect (Fig. 2a).…”

Section: Tested Specimens Descriptionmentioning

confidence: 99%

“…The effectiveness of defect detection of the fit slope (m) and the determination coefficient (R 2 ) will be significantly enhanced by adopting an optimization algorithm to better utilize the spatial information derived from the thermographic data. Additionally, the authors introduce the fit intercept (q) and fit standard deviation (S ρ ) as defect detectors, [18].…”

Section: Introductionmentioning

confidence: 99%

Metrology and Measurement Systems

Dinardo¹,

Fabbiano²,

Tamborrino³

et al. 2020

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In the framework of non-destructive evaluation (NDE), an accurate and precise characterization of defects is fundamental. This paper proposes a novel method for characterization of partial detachment of thermal barrier coatings from metallic surfaces, using the long pulsed thermography (LPT). There exist many applications, in which the LPT technique provides clear and intelligible thermograms. The introduced method comprises a series of post-processing operations of the thermal images. The purpose is to improve the linear fit of the cooling stage of the surface under investigation in the logarithmic scale. To this end, additional fit parameters are introduced. Such parameters, defined as damage classifiers, are represented as image maps, allowing for a straightforward localization of the defects. The defect size information provided by each classifier is, then, obtained by means of an automatic segmentation of the images. The main advantages of the proposed technique are the automaticity (due to the image segmentation procedures) and relatively limited uncertainties in the estimation of the defect size.

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“…Thermography is in the following proposed as a complementary technique to make reliable and noninvasive assessment of the integrity state of archaeological heritage. Thermal imaging is an effective and valuable tool for detecting defects, erosions, fissures, damages, and material irregularities without any risk for the investigated object, [12], [13]. Advanced uncooled thermal cameras can capture thermal images with high resolution and sensitivity by measuring the radiance emitted by the observed object in the range of the infrared spectrum.…”

Section: Introductionmentioning

confidence: 99%

An Emissivity-based Approach to Assess the Integrity State of Archaeological Discoveries by Thermography

Morello¹,

Gennaro²,

Fabbiano³

2023

Proceedings of the 2022 IMEKO TC4 International Conference on Metrology for Archaeology and Cultural Heritage

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In this paper the authors propose an innovative technique to evaluate the integrity state of archaeological discoveries by using thermography. The proposed approach is based on the concept of emissivity. The case study is a marble bust of a woman that dates back to ancient Rome. The emissivity of the bust material has been evaluated by using a standardized procedure. To assess the integrity state of the sculpture, the environment temperature has been kept under control to allow the bust to reach thermal equilibrium. By evaluating pixel by pixel, the temperature deviation around the known equilibrium value, it has been possible to map the emissivity changes in the sculpture due to different conservation or decay states: alveolisation process, erosion, damages, deposition of iron oxide, etc. The proposed approach has allowed us to correlate the changes of emissivity with the integrity state of the sculpture. Preliminary studies on the bust provide interesting information about the deterioration from the original condition.

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Automatic defect detection from thermographic non destructive testing

Cited by 5 publications

References 10 publications

Evaluation of Intermediate Precision in Thermographic Measurements for Monitoring the Conservation State of Metallic Discoveries

Evaluation of Intermediate Precision in Thermographic Measurements for Monitoring the Conservation State of Metallic Discoveries

Metrology and Measurement Systems

An Emissivity-based Approach to Assess the Integrity State of Archaeological Discoveries by Thermography

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