Passive and active infrared thermography: An overview of applications for the inspection of mosaic structures

Theodorakeas, Panagiotis; Cheilakou, Eleni; Ftikou, Ekaterini; Koui, Maria

doi:10.1088/1742-6596/655/1/012061

Cited by 29 publications

(28 citation statements)

References 6 publications

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“…and bedding mortar, providing detailed complementary information to the assessment of aging and decay of materials due to porosity, cracking, to correlate the revealed water intrusions and the identification of the possible level of moisture in the subsurface beneath the mosaics [61][62][63][64]. The studies conducted since 2000 also included evaluations of compatibility of consolidation interventions [65] and led to a series of advancing experimental laboratory studies [66,67]. and bedding mortar, providing detailed complementary information to the assessment of aging and decay of materials due to porosity, cracking, to correlate the revealed water intrusions and the identification of the possible level of moisture in the subsurface beneath the mosaics [61][62][63][64].…”

Section: In-situ Resultsmentioning

confidence: 99%

Wall Mosaics: A Review of On-Site Non-Invasive Methods, Application Challenges and New Frontiers for Their Study and Preservation

2020

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This review concerns the challenges and perspectives of on-site non-invasive measurements applied to wall mosaics. Wall mosaics, during the centuries, decorated numerous buildings, nowadays being part of world cultural heritage. The preservation and maintenance of these valuable decorations are undoubtedly directly dependent on identifying possible problems that could affect their hidden structure. On-site non-invasive methods, using different contact or no-contact technologies, can offer support in this specific field of application. The choice of the appropriate technique or combination of different techniques depends, in general, on the depth of investigation, the resolution, the possibility to have direct contact with the surfaces or, on the contrary, limited accessibility of the wall mosaics due to their location (e.g., vaults), as well as deterioration problems, (e.g., voids, detachments, or humidity effects). This review paper provides a brief overview of selected recent studies regarding non-invasive methods applied to the analysis of wall mosaics. This review, discussing the assessment of advantages and limitations for each method here considered, also considers possible future developments of imaging techniques in this specific context for cultural heritage applications.

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Section: In-situ Resultsmentioning

confidence: 99%

Wall Mosaics: A Review of On-Site Non-Invasive Methods, Application Challenges and New Frontiers for Their Study and Preservation

2020

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“…The described approach can be considered as a further development of standard laser flash technique [14][15][16][17]. Low standard errors and low requirements for measurement conditions are mostly due to analysis of not just the only function T(t)of one argument acquired just once per testing, but large two-dimensional array of data T(r, t), while for each given value of t, the dependence T(r) results from the averaging of tens to hundreds of points located at the same distance to the center of the heating spot.…”

Section: Discussion Of Thermal Diffusivity Measuringmentioning

confidence: 99%

“…The active mode of thermography is most often implemented using optical excitation (stimulation) generated by laser or high-powered halogen lamps with subsequent or simultaneous recording of transient temperature distribution with a high spatial-temporal resolution thermal camera [6][7][8][9]. Modern thermographic methods employing mathematical models and thermogram analysis techniques developed in recent years allow extracting a lot of useful information about the state of various objects-from small components of microelectronics [10,11] to large products [12][13][14][15], artworks [16,17], and engineering structures [14,18,19]. They can also be used to conduct nondestructive testing of materials [20][21][22][23][24][25][26][27], determine their thermal physical characteristics (TPC) [28][29][30][31], and determine the degree of corrosive damage [32].…”

Section: Introductionmentioning

confidence: 99%

Temperature Diffusivity Measurement and Nondestructive Testing Requiring No Extensive Sample Preparation and Using Stepwise Point Heating and IR Thermography

Golovin¹,

Divin²,

Samodurov³

et al. 2019

Failure Analysis

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This chapter describes a modification to the laser flash method that allows determining temperature diffusivity and nondestructive testing of materials and constructions without cutting samples of predefined geometry. Stepwise local heating of the studied object surface at a small spot around 0.1 mm radius with simultaneous high temporary-spatial resolution infrared (IR) filming of the transient temperature distribution evolution with a thermal camera provides a wide range of possibilities for material characterization and sample testing. In case of isotropic and macroscopic homogeneous materials, the resulting transient temperature distribution is radially symmetric that renders possible to improve temperature measurement accuracy by averaging many pixels of the IR images located at the same distance from the heating spot center. The temperature diffusivity measurement can be conducted either on thin plates or on massive samples. The developed emissivity independent in plain IR thermographic method and mathematical algorithms enable thermal diffusivity measurement for both cases with accuracy around a few per cent for a wide range of materials starting from refractory ceramics to well-conducting metals. To detect defects, the differential algorithm was used. Subtracting averaged radial symmetric temperature distribution from the original one for each frame makes local inhomogeneities in the sample under study clearly discernible. When applied to crack detection in plates, the technique demonstrates good sensitivity to part-through cracks located both at the visible and invisible sides of the studied object.

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“…The thermographic investigation that involves heating or cooling process has been proven to present much more potentiality than the ordinary passive system (Theodorakeas, Cheilakou, Ftikou & Koui, 2015 (Manickavasagan et al, 2010). The techniques used for generating thermal energy in active thermal imaging include (i) applying thermal excitation by a sinusoidal varying light source (such as halogen lamps or laser beam) to entice thermal energy to the target object in order to generate thermal waves that excite heat flow within the object tissues, (ii) applying ultrasonic waves for excitation the thermal energy in the target object, (iii) application of a short-term energy pulse of different durations for disturbing the thermal equilibrium within the object tissues and (iv) employing sonic waves to impart the surface of the target object without heating the object (Shepard, Ahmed & Lhota, 2004).…”

Section: Active and Passive Thermal Imaging Systemsmentioning

confidence: 99%

Emerging thermal imaging techniques for seed quality evaluation: Principles and applications

ElMasry

ElGamal

Mandour

et al. 2020

Food Research International

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Due to the massive progress occurred in the past few decades in imaging, electronics and computer science, infrared thermal imaging technique has witnessed numerous technological advancement and smart applications in non-destructive testing and quality monitoring of different agro-food produces. Thermal imaging offers a potential non-contact imaging modality for the determination of various quality traits based on the infrared radiation emitted from target foods. The technique has been moved from just an exploration method in engineering and astronomy into an effective tool in many fields for forming unambiguous images called thermograms eventuated from the temperature and thermal properties of the target objects. It depends principally on converting the invisible infrared radiation emitted by the objects into visible two-dimensional temperature data without making a direct contact with the examined objects. This method has been widely used for different applications in agriculture and food science and technology with special applications in seed quality assessment. This article provides an overview of thermal imaging theory, briefly describes the fundamentals of the system and explores the recent advances and research works conducted in quality evaluation of different sorts of seeds. The article comprehensively reviewed research efforts of using thermal imaging systems in seed applications including estimation of seed viability, detection of fungal growth and insect infections, detection of seed damage and impurities, seed classification and variety identification.

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Passive and active infrared thermography: An overview of applications for the inspection of mosaic structures

Cited by 29 publications

References 6 publications

Wall Mosaics: A Review of On-Site Non-Invasive Methods, Application Challenges and New Frontiers for Their Study and Preservation

Wall Mosaics: A Review of On-Site Non-Invasive Methods, Application Challenges and New Frontiers for Their Study and Preservation

Temperature Diffusivity Measurement and Nondestructive Testing Requiring No Extensive Sample Preparation and Using Stepwise Point Heating and IR Thermography

Emerging thermal imaging techniques for seed quality evaluation: Principles and applications

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