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Littérature scientifique sur le sujet « Thermographie – analyse »

Auteur : Grafiati

Publié le 17 octobre 2023

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Articles de revues sur le sujet "Thermographie – analyse"

Jordan, C., et M. Harasek. « Infrarot-Thermographie zur Analyse eines neuartigen Tischgrillsystems ». Chemie Ingenieur Technik 82, n^o 9 (27 août 2010) : 1448–49. http://dx.doi.org/10.1002/cite.201050578.

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Chrysochoos, A., J. C. Chezeaux et H. Caumon. « Analyse thermomécanique des lois de comportement par thermographie infrarouge ». Revue de Physique Appliquée 24, n^o 2 (1989) : 215–25. http://dx.doi.org/10.1051/rphysap:01989002402021500.

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Pasquetti, R., et D. Petit. « Analyse modale d'un processus de diffusion thermique : identification par thermographie infra-rouge ». International Journal of Heat and Mass Transfer 31, n^o 3 (mars 1988) : 487–96. http://dx.doi.org/10.1016/0017-9310(88)90030-0.

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Livada, Časlav, Hrvoje Glavaš, Alfonzo Baumgartner et Dina Jukić. « The Dangers of Analyzing Thermographic Radiometric Data as Images ». Journal of Imaging 9, n^o 7 (12 juillet 2023) : 143. http://dx.doi.org/10.3390/jimaging9070143.

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Thermography is probably the most used method of measuring surface temperature by analyzing radiation in the infrared part of the spectrum which accuracy depends on factors such as emissivity and reflected radiation. Contrary to popular belief that thermographic images represent temperature maps, they are actually thermal radiation converted into an image, and if not properly calibrated, they show incorrect temperatures. The objective of this study is to analyze commonly used image processing techniques and their impact on radiometric data in thermography. In particular, the extent to which a thermograph can be considered as an image and how image processing affects radiometric data. Three analyzes are presented in the paper. The first one examines how image processing techniques, such as contrast and brightness, affect physical reality and its representation in thermographic imaging. The second analysis examines the effects of JPEG compression on radiometric data and how degradation of the data varies with the compression parameters. The third analysis aims to determine the optimal resolution increase required to minimize the effects of compression on the radiometric data. The output from an IR camera in CSV format was used for these analyses, and compared to images from the manufacturer’s software. The IR camera providing data in JPEG format was used, and the data included thermographic images, visible images, and a matrix of thermal radiation data. The study was verified with a reference blackbody radiation set at 60 °C. The results highlight the dangers of interpreting thermographic images as temperature maps without considering the underlying radiometric data which can be affected by image processing and compression. The paper concludes with the importance of accurate and precise thermographic analysis for reliable temperature measurement.

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Yang, B., P. K. Liaw, J. Y. Huang, R. C. Kuo, J. G. Huang et D. E. Fielden. « Stress Analyses and Geometry Effects During Cyclic Loading Using Thermography ». Journal of Engineering Materials and Technology 127, n^o 1 (1 janvier 2005) : 75–82. http://dx.doi.org/10.1115/1.1836793.

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A high-speed and high-sensitivity thermographic-infrared (IR) imaging system has been used to investigate the temperature evolutions of SA533B1 steel specimens during high-cycle fatigue experiments. Both thermodynamics and heat-transfer theories are applied to quantify the relationship between the observed temperature variations and stress–strain states during fatigue. The thermoelastic effect has been utilized to calculate the maximum stress level during fatigue testing. The predicted results matched the experimental data quite well. Different temperature and strain behaviors have been observed between cylindrical and flat specimens during high-cycle fatigue experiments. Explanations have been provided, based on Lu¨ders band evolutions in flat specimens during fatigue, which have been observed in detail by thermography. Numerical methods have been provided to convert the temperature map (thermograph) into heat-dissipation-rate (HDR) map, which illustrates the kinetics of the Lu¨ders-band evolution. Thus, the thermography technology can provide an effective means to “watch” and “quantify” the heat-evolution processes, such as the mechanical-damage behaviors, which can open up new opportunities for in- situ studying mechanical and phase-transformation behaviors in detail.

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Kim, Jeong Guk, Seung Koo Baek, Chang Young Lee et Sung Cheol Yoon. « Deterioration and Thermographic Analyses of Electrical Units in Diesel Locomotive ». Key Engineering Materials 417-418 (octobre 2009) : 729–32. http://dx.doi.org/10.4028/www.scientific.net/kem.417-418.729.

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The electrical units of diesel electric locomotives, which were used for over 30 years, were characterized for deterioration evaluation through insulation resistance measurement, degradation testing, and infrared thermography method. Especially, an infrared camera and thermocouples were employed for the evaluation. The thermocouples were attached on high-voltage cables connected to traction motors, for in-situ measurement of abnormal heating during test running. After test running, the thermographic images were obtained for the inspection of high-voltage cables using the infrared camera. The thermographic results were quantitatively analyzed, and compared with temperature changes during running. In this investigation, various analysis techniques for the safety characterization of diesel electric locomotives have been introduced, and the analysis results have been used to provide the deterioration or wear information in current locomotive systems.

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Liu, Yi, Fumin Wang, Zhili Jiang, Stefano Sfarra, Kaixin Liu et Yuan Yao. « Generative Deep Learning-Based Thermographic Inspection of Artwork ». Sensors 23, n^o 14 (13 juillet 2023) : 6362. http://dx.doi.org/10.3390/s23146362.

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Infrared thermography is a widely utilized nondestructive testing technique in the field of artwork inspection. However, raw thermograms often suffer from problems, such as limited quantity and high background noise, due to limitations inherent in the acquisition equipment and experimental environment. To overcome these challenges, there is a growing interest in developing thermographic data enhancement methods. In this study, a defect inspection method for artwork based on principal component analysis is proposed, incorporating two distinct deep learning approaches for thermographic data enhancement: spectral normalized generative adversarial network (SNGAN) and convolutional autoencoder (CAE). The SNGAN strategy focuses on augmenting the thermal images, while the CAE strategy emphasizes enhancing their quality. Subsequently, principal component thermography (PCT) is employed to analyze the processed data and improve the detectability of defects. Comparing the results to using PCT alone, the integration of the SNGAN strategy led to a 1.08% enhancement in the signal-to-noise ratio, while the utilization of the CAE strategy resulted in an 8.73% improvement.

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Figueredo, Antonio, Mauro Azevedo, Paula Da Silveira, Jhulie Lima, Kaylane Teixeira, Andrea Alvarado, Isaac Brígido et al. « Infrared thermography as a complementary tool in dental ». Concilium 23, n^o 10 (1 juin 2023) : 445–53. http://dx.doi.org/10.53660/clm-1398-23f31.

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Infrared cameras have the ability to measure infrared radiation, resulting in the generation of thermal images where each pixel refers to a different temperature value. Thermographic images allow measuring the thermal variations that can be used to obtain physiological information. This study aimed to analyze the applications of thermography in dentistry through an integrative literature review. This work is the result of research carried out in the following databases: Virtual Health Library (VHL), PubMed, Ebsco and ScienceDirect. The following descriptors “thermography”, “dentistry” and “diagnosis were used, and 13 articles were selected to compose this work. This integrative review allowed analyzing, through several studies, the clinical applications of thermography in dentistry. Because it is a non-invasive method, this technique has a promising future in dentistry. Therefore, based on the studies already published and analyzed, it can be concluded that infrared thermography is an auxiliary tool in dental diagnosis and useful for monitoring and examining therapeutic interventions.

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Glavaš, Hrvoje, Marijana Hadzima-Nyarko, Ivana Haničar Buljan et Tomislav Barić. « Locating Hidden Elements in Walls of Cultural Heritage Buildings by Using Infrared Thermography ». Buildings 9, n^o 2 (28 janvier 2019) : 32. http://dx.doi.org/10.3390/buildings9020032.

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The structure of Tvrđa and its buildings date back to the Middle Ages. Tvrđa represents the Old Town of the city of Osijek and the best-preserved and largest ensemble of Baroque buildings in Croatia. After the withdrawal of the Ottomans in 1687, during the 18th century, the Austro-Hungarian administration systematically formed a new fortification system, regulated streets and squares and built a large number of military objects. Tvrđa took its present form in the 19th century and has kept it since then. Investigating the historical development of individual buildings, in addition to archival sources and existing architectural documentation, the obvious source of information are the buildings themselves. The aim of this paper is to explore the possibilities of using infrared thermography to find structural elements and hidden openings in historic buildings in Osijek’s Tvrđa. This paper describes the exploration of the 18th century openings on the facades of the former Kostić houses. The facades were bricked into the walls in the 19th century because houses were reused and their purposes changed from commercial to residential. Infrared thermography is often a starting, nondestructive testing method (NDT) for building analyses. This paper presents thermographic analyses of two buildings. The analyses were carried out in December 2017 and January 2018. Using a steady-state thermographic analysis of a building envelope as the first step, the audit was continued with step heating (SH) of an interest point where changes in a thermal pattern were expected due to additional bricking. Heat flux was generated by the usage of a heat gun for paint removal.

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Barros, Ana, Joaquim Mendes, André Moreira, Ricardo Vardasca, Miguel Pais Clemente et Afonso Pinhão Ferreira. « Thermographic Study of the Orofacial Structures Involved in Clarinetists Musical Performance ». Dentistry Journal 6, n^o 4 (1 novembre 2018) : 62. http://dx.doi.org/10.3390/dj6040062.

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Introduction: Wind instrumentalists like clarinetists, may present a muscular hyperactivity on certain groups of the cranio-cervico-mandibular complex, due to their musical activity. Therefore, the use of infrared thermography can be used to assess and characterize the orofacial structures involved in clarinet performance. Aim: The objective of this study was to analyze and record the thermal patterns using the thermographic camera Flir® E60sc to evaluate anatomically and physiologically certain orofacial structures of the cranio-cervical-mandibular complex, such as the masticatory muscles and the region of the temporomandibular joint. Methodology: A sample of 30 clarinetists completed an individual questionnaire composed of two components (musical and clinical history of the participant), and were subjected to a clinical examination. Four thermographic images were taken of the cranio-cervical-mandibular complex at a rest position with frontal, right lateral, left lateral and anterior dentoalveolar components views. Each musician performed a piece of music for an uninterrupted period of 10 min. New thermographic images were captured with the same incidences, after the performance, respecting the same protocol. Results: There were statistically significant differences in the areas corresponding to the left temporal muscle, the orbicularis muscle (labial component), the left and right perioral teguments, as well as in the upper central incisors. There was also statistical evidence regarding the initial and final temperature asymmetries regarding temporal muscle and orbicular muscles (labial and marginal components). Conclusion: Infrared thermography has been shown to be an effective complementary diagnostic tool in the monitorization of the cranio-cervical-mandibular complex of clarinetists.

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Thèses sur le sujet "Thermographie – analyse"

Couturier, Jean-Pierre. « Analyse fréquentielle de la thermographie de phase pulsée ». Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq25541.pdf.

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Maurice, A. « Traitement, analyse et représentation d'images infrarouges ». Aix-Marseille 3, 1987. http://www.theses.fr/1987AIX30071.

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Ce mémoire présente successivement les trois classes de traitements informatiques nécessaires à l'exploitation d'une image infrarouge à savoir ; traitements d'Amélioration, de Calcul et d'Analyse. La numérisation générant un bruit non négligeable, la première classe rassemble les traitements que doivent subir toutes images pour être mieux exploitables. La seconde classe inclue" la saisie des paramétres de la scène : [paramétres physiques (températures et émissivité globale et paramétres électroniques (gain de la caméra)!, le calcul des températures réelles des objets observés, leurs corrections éventuelles en regard des émissivités propres, la réalisation d'histogrammes ou de profils sur la totalité de l'image ou sur des fenêtres. La dernière classe (analyse de la scène) rassemble des procédures d'extractions des contours des formes présentes sur l'image. Cette extraction passe par la recherche du seuil 4e caractéristique de binarisation, puis la recherche et le codage des contours extérieurs et intérieurs. Cette analyse a conduit à la réalisation d'un logiciel de thermographie assistée par ordinateur, convivial et intenactif, qui permet l'exploitation rapide d'images infrarouges.

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Benaarbia, Adil. « Analyse énergétique du comportement thermomécanique du PA6.6 chargé de fibres de verre ». Thesis, Montpellier 2, 2014. http://www.theses.fr/2014MON20196.

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Cette étude présente une analyse thermomécanique du comportement en fatigue oligocyclique du polyamide 6.6 vierge et renforcé de fibres de verre courtes. Des bilans d'énergie sont réalisés en utilisant, de façon combinée, des techniques d'imagerie quantitative visible et infrarouge. Les champs de température sont obtenus par thermographie et les champs de déformation par corrélation d'images. Sur un cycle de chargement, on montre comment il est possible d'estimer séparément les sources de chaleurs moyennes par cycle, sources associées aux mécanismes dissipatifs et induites par les effets de couplage thermomécanique. On montre ensuite, pour différentes fréquences de chargement, l'évolution du bilan de puissance moyen par cycle sur une zone matérielle correspondant à la partie utile de l'éprouvette. Ce bilan prend en compte le taux de l'énergie de déformation, les chaleurs mises en jeu et les variations d'énergie interne. On observe que la forme du bilan de puissance est très fortement dépendante, pour un rapport de charge donné, à la fréquence de sollicitation, à la teneur en eau, à l'orientation des fibres de verre mais aussi aux niveaux de contrainte appliqués
This study presents a thermomechanical analysis of fatigue behavior of pure and short glass- fiber reinforced polyamide 6.6. The energy balances are drew up using the combined application of visible and infrared quantitative imaging techniques. Temperature fields are obtained by thermography and strain fields by image correlation. Over one complete cycle, we show how it is possible to separately estimate the heat sources averaged over the cycle, associated with dissipative mechanisms and induced by thermomechanical coupling source effets. Then we show, for different loading rates, the time courses of the energy rate balance for a physical area corresponding to the gage part of the specimen. This balance takes into account the deformation energy rate, the heat sources and the internal energy variations. It is observed that the shape of the energy rate balance is highly dependent, for a given load ratio, to the load rate, the water content, the orientation of the glass fibers and the applied stress levels

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Louche, Hervé. « Analyse par thermographie infrarouge des effets dissipatifs de la localisation dans des aciers ». Phd thesis, Université Montpellier II - Sciences et Techniques du Languedoc, 1999. http://tel.archives-ouvertes.fr/tel-00259398.

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La compréhension et la modélisation des mécanismes de localisation observés lors de processus d'emboutissage représentent un enjeu industriel important. L'objectif de ce travail est d'étudier, par une approche expérimentale basée sur l'analyse des sources de chaleur, les manifestations de localisation pouvant se produire, sur des aciers, lors d'essais quasi-statiques de traction monotone.
A partir d'un traitement d'images thermiques infrarouge (effets) et de l'équation de diffusion de la chaleur, on propose une méthode permettant d'estimer les sources de chaleur (causes) générées par le processus de déformation.
Sur certains aciers doux, on met en évidence la propagation à vitesse uniforme d'une ou plusieurs bandes dissipatives étroites à travers la zone utile de l'éprouvette. Comparativement à ce premier mode (bandes de Lüders) où les effets dissipatifs sont soudains, intenses et très localisés, on met en évidence le caractère plus régulier et progressif de la concentration des zones où se développent les irréversibilités mécaniques menant à la striction localisée. Des "indicateurs de localisation énergétiques'' proposés pour détecter la localisation montrent qu'elle peut apparaître avant le maximum de la charge, dans plusieurs zones de l'éprouvette. Ce constat implique que la partie utile d'une éprouvette doit être considérée comme une structure et non comme un élément de volume réagissant de façon homogène, ce qui n'est pas sans conséquences sur les méthodes d'identification des modèles de comportement utilisés, en particulier, dans les approches théoriques de la localisation.
Enfin, d'autres expériences ont permis de mettre en évidence des manifestations énergétiques associées à des formes particulières de localisation : propagation de fronts de changement de phase (acier inoxydable A301), effets dissipatifs associés à des bandes de glissement (acier magnétique HiBiGO), effets dissipatifs localisés dans des bandes de cisaillement (polymère PVC).

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Lisle, Teddy. « Analyse par thermographie infrarouge de l'endommagement des structures composites sous sollicitations quasi statiques ». Toulouse 3, 2014. http://thesesups.ups-tlse.fr/2381/.

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La sensibilité des structures composites à la présence d'endommagements importants en zones singulières (trou, pointe d'entaille,. . . ) impose d'évaluer leur tolérance aux dommages. Dans ce contexte, ce travail s'attache à apporter des précisions quantitatives sur l'endommagement de ces structures à partir de la technique de thermographie infrarouge. Une première étude a été consacrée à la caractérisation des mécanismes de dégradation d'un stratifié tissé mince (verre/époxyde) sous sollicitations homogènes. En s'appuyant sur une approche calorimétrique locale, régie par le cadre de la Thermodynamique des Processus Irréversibles, les mesures thermiques sont utilisées pour localiser et quantifier les dissipations associées aux différents mécanismes de dégradation. Une démarche expérimentale est alors proposée pour évaluer le taux de restitution d'énergie dans plusieurs cas de fissuration. Dans un second temps, cette démarche est appliquée à l'étude de la fissuration de structures stratifiées constituées de plis unidirectionnels sous chargement de traction, puis de compression
The sensibility of the composite structures in the presence of important damages in singular zones (hole, notch tip,. . . ) involves to estimate their damage tolerance. In this context, this work attempts to bring quantitative precision on the damage of these structures by the mean of infrared thermography. A first study was dedicated to the characterization of the degradation mechanisms in a thin woven laminate (glass/epoxy) under homogeneous loading. Founded on a local calorimetric approach, governed by the frame of the Thermodynamics of Irreversible Processes, the thermal measures are used to locate and quantify the dissipative energy associated with the various mechanisms of degradation. An experimental approach is then proposed to estimate the energy release rate in several cases of cracking. Secondly, this approach is used to study the rupture of laminated structures made of unidirectional plies under tensile loading, then compressive loading

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Duveau, Jean. « Étude des comportements thermique et électrique couplés de cellules et modules photovoltaïques spatiaux en liaison avec leurs conditions de fonctionnement : modélisation, analyse par thermographie infrarouge ». Aix-Marseille 3, 1991. http://www.theses.fr/1991AIX30006.

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L'etude faisant l'objet de ce travail a porte sur l'analyse du comportement thermique et electrique de photopiles spatiales, en particulier sur leur tenue en polarisation inverse dans une configuration aussi proche que possible des conditions de fonctionnement dans l'espace. La premiere phase de ce travail est consacree a l'etude d'un lot de photopiles, placees individuellement sur un support a temperature controlee dans le domaine 30c, +150c, la deuxieme, est etendue a l'etude de coupons, type gsr3, representatifs du generateur solaire, et dans des conditions simulant l'environnement spatial. Ces etudes thermiques couplees ont necessite la mise au point d'un banc de caracteriation electrique des cellules sous simulateur solaire (en polarisation directe et inverse) associe a l'observation simultanee, par thermographie infrarouge, de la distribution de temperature sur la surface des cellules ou du coupon. Outre une connaissance plus approfondie du comportement inverse des ellules bsr ou bsfr, jusqu'a des tensions entrainant le claquage cette a permis de montrer comment se manifestaient les dissipations de puissance et quel inconvenients pouvaient en resulter pour les cellules et pour le generateur solaire. Il a enfin ete possible de representer les zones de fonctionneemnt (v-i-t) sans risque pour le generateur et sans protection indispensable par les diodes shunts

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TOROYAN, PIERRE-CHARLES. « Valeur previsionnelle predictive et pronostique de la thermographie infra-rouge mammaire : analyse multifactorielle a propos de 1700 cas ». Aix-Marseille 2, 1988. http://www.theses.fr/1988AIX20298.

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Reungoat, David. « Analyse de la température à l'interface d'une garniture mécanique par mesure par thermographie infrarouge ». Poitiers, 1994. http://www.theses.fr/1994POIT2355.

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Les garnitures mecaniques, ou joints d'etancheite a faces radiales, sont de plus en plus utilises dans les mecanismes tournants (conditions de fonctionnement extremes, machines de haute technologie, etc). Or le comportement de cet element mecanique est principalement dirige par les phenomenes thermiques. Les travaux publies au sujet des temperatures dans une garniture sont rares. Nous avons elabore puis de valide une methode de mesure de la temperature a l'interface d'une garniture par thermographie infrarouge. Cette methodologie est applicable pour la mesure des temperatures d'une surface opaque mouvement (ou d'un fluide) au travers d'un film mince semi-transparent. Elle prend en compte l'effet des dioptres et le phenomene de la semi-transparence. Les differents coefficients radiatifs, ont ete etalonnes en fonction de la temperature et de l'epaisseur du milieu considere. Une modelisation numerique du joint mecanique est developpee afin d'ajuster les parametres de fonctionnement de la garniture experimentale un regime de poursuite dynamique. Les resultats experimentaux sont analyses en fonction des conditions de fonctionnement dynamique du joint. L'analyse des resultats en regime transitoire ou stationnaire nous permet de confirmer l'hypothese d'une geometrie de l'interface imposee par les phenomenes thermiques. Les deformations thermoelastiques a l'interface sont etudiees en fonction des parametres: pressions, temperatures, vitesses etc. . Les resultats montrent que dans le cas ou les faces sont en contact il existe des gradients de temperature dans l'interface de l'ordre de 10 a 20c. Par contre, dans le cas ou la fuite apparait, l'hypothese d'une temperature uniforme dans l'interface peut etre appliquee. Mais l'utilisation de la garniture nous apprend que la fuite ne correspond pas au mode de fonctionnement normal de la garniture. Nous constatons aussi que le stator ne peut etre considere isole thermiquement

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Boulanger, Thomas. « Analyse par thermographie infrarouge des sources de chaleur induites par la fatigue des aciers ». Montpellier 2, 2004. http://www.theses.fr/2004MON20224.

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Bouzida, Nabila. « Extraction de la signature veineuse dans le moyen (MWIR) et le proche infrarouge (NIR) - Analyse de la thermorégulation du corps ». Thesis, Université Laval, 2009. http://www.theses.ulaval.ca/2009/26541/26541.pdf.

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Livres sur le sujet "Thermographie – analyse"

Dolgov, I., Mihail Volovik et Andrey Mahnovskiy. Thermographic signs of certain diseases of the respiratory system (acute sinusitis, pneumonia) Thermography Atlas. ru : INFRA-M Academic Publishing LLC., 2021. http://dx.doi.org/10.12737/textbook_61b1ab7de6b1f9.69203696.

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The present issue focuses on the practice of medical thermal imaging in patients with paranasal sinusitis and pneumonia. The description of thermograms is based on a quantitative analysis of temperature gradients and trends in temperature of different body regions (Projection «head front» for paranasal sinusitis, «breast front» and «back», in a defined layout formed in «cloud» thermograms analysis program "Tvision" of «Dignosis», Russia) with values of thermographic markers that demonstrated their differentiating capabilities when compared with reference methods. Thus, the thermographic conclusion is formed not simply by thermal phenomenon «hot-cold», but on the basis of numerical values of markers, which indicate hypothetical nosological diagnosis and significantly simplifies the algorithm for those physicians who use this method as an additional. The publication is intended for doctors of any speciality who, in their daily clinical practice, treat the patients with suspicions disease of respiratory system

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Holroyd, Edmond W. Analyses of the thermal mapping data for the lower Yakima River. Denver, Colo : Technical Service Center, U.S. Dept. of the Interior, Bureau of Reclamation, 1998.

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1934-, Liebman S. A., et Levy E. J. 1929-, dir. Pyrolysis and GC in polymer analysis. New York : M. Dekker, 1985.

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Joint EOSAT/NASA Thermal Infrared Working Group. Commercial applications and scientific research requirements for thermal-infrared observations of terrestrial surfaces : A report of the Joint EOSAT/NASA Thermal Infrared Working Group. Sous la direction de Putnam Evelyn S, United States. National Aeronautics and Space Administration. Earth Science and Applications Division. et Eosat. Washington, D.C : National Aeronautics and Space Administration, Earth Science and Applications Division, 1986.

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Koprowski, Robert. Processing Medical Thermal Images : Using Matlab®. Springer, 2017.

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Koprowski, Robert. Processing Medical Thermal Images : Using Matlab®. Springer, 2018.

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Quantitative Remote Sensing in Thermal Infrared. Scitus Academics Llc, 2016.

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Nixdorff, Uwe, Stephan Achenbach, Frank Bengel, Pompillio Faggiano, Sara Fernández, Christian Heiss, Thomas Mengden et al. Imaging in cardiovascular prevention. Oxford University Press, 2015. http://dx.doi.org/10.1093/med/9780199656653.003.0006.

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Imaging tools in preventive cardiology can be divided into imaging modalities to assess pre-clinical and clinical atherosclerosis and functional assessments of vascular function or vascular inflammation. To calculate the likelihood of pre-clinical atherosclerosis intima-media thickness as well as coronary calcium scoring are most frequently used. However, beyond these two there are other parameters derived by ultrasound and multi-detector computed tomography as well as magnetic resonance imaging and nuclear/molecular imaging which are discussed in the chapter. Functional tests include flow-mediated dilatation, pulse wave analysis, and the ankle-brachial index. In clinical research other invasive measurements such as intravascular ultrasound/virtual histology/elastography, optical coherence tomography as well as thermography are being used. However, their value in clinical prevention still needs to be established.

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Chapitres de livres sur le sujet "Thermographie – analyse"

Campbell, James Stewart, et M. Nathaniel Mead. « Formatting and Analysis of Thermal Images ». Dans Human Medical Thermography, 69–84. Boca Raton : CRC Press, 2022. http://dx.doi.org/10.1201/9781003281764-8.

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Batsale, Jean-Christophe, André Chrysochoos, Hervé Pron et Bertrand Wattrisse. « Thermographic Analysis of Material Behavior ». Dans Full-Field Measurements and Identification in Solid Mechanics, 439–68. Hoboken, NJ USA : John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118578469.ch16.

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Maldague, Xavier P. V. « Quantitative Analysis of Delaminations ». Dans Nondestructive Evaluation of Materials by Infrared Thermography, 113–38. London : Springer London, 1993. http://dx.doi.org/10.1007/978-1-4471-1995-1_6.

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Moraru, Edgar, Mariana-Florentina Stefanescu, Octavian Dontu, Ciprian Rizescu et Carmen Draghici. « Thermographic Analysis of 3D Printed Dental Models ». Dans Proceedings of the International Conference of Mechatronics and Cyber- MixMechatronics - 2020, 149–55. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53973-3_16.

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Esel, Yunus E., Ercan Erkul, Sandra Hintz, Detlef Schulte-Kortnack, Christian Leonhardt, Julika Heller et Thomas Meier. « St. Petri Cathedral Schleswig : non-destructive geophysical damage analysis of medieval plaster ». Dans Advances in On- and Offshore Archaeological Prospection, 681–90. Kiel : Universitätsverlag Kiel | Kiel University Publishing, 2023. http://dx.doi.org/10.38072/978-3-928794-83-1/p69.

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Non-destructive geophysical methods were applied to detect moisture at the St. Petri Cathedral in Schleswig. One of them is thermography, which allows to distinguish between intact and defective medieval plaster. Additionally, thesuccess of a restoration can be determined by ultrasonic surface measurements.

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Rumiński, Jacek, Mariusz Kaczmarek et Antoni Nowakowski. « Medical Active Thermography — A New Image Reconstruction Method ». Dans Computer Analysis of Images and Patterns, 274–81. Berlin, Heidelberg : Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/3-540-44692-3_34.

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González, J. R., É. O. Rodrigues, C. P. Damião, C. A. P. Fontes, A. C. Silva, A. C. Paiva, H. Li, C. Du et A. Conci. « An Approach for Thyroid Nodule Analysis Using Thermographic Images ». Dans Application of Infrared to Biomedical Sciences, 451–75. Singapore : Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3147-2_26.

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Tossell, David A. « Analysis of Heat Input Effects in Passive Thermographic NDE ». Dans Review of Progress in Quantitative Nondestructive Evaluation, 1763–70. Boston, MA : Springer US, 1989. http://dx.doi.org/10.1007/978-1-4613-0817-1_223.

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Prestes, Rafael Cavalli, Elisa Marangon Beretta, Fabio Pinto da Silva, Wilson Kindlein et Vilson João Batista. « Development and Thermographic Analysis of Custom Seats for Wheelchairs ». Dans Smart Design, 97–102. London : Springer London, 2012. http://dx.doi.org/10.1007/978-1-4471-2975-2_11.

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Love, T. J. « Analysis and Application of Thermography in Medical Diagnosis ». Dans Heat Transfer in Medicine and Biology, 333–52. Boston, MA : Springer US, 1985. http://dx.doi.org/10.1007/978-1-4684-8285-0_10.

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Actes de conférences sur le sujet "Thermographie – analyse"

Ludwig, N., J. Melada, M. Gargano, L. Bonizzoni, M. Giudici et T. Apuani. « Infrared thermography analysis of the ancient soapstone quarry in Chiavenna ». Dans QIRT. QIRT Council, 2022. http://dx.doi.org/10.21611/qirt.2022.2027.

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The research aims to characterize the thermal behavior of a rock mass forming a little hill at the confluence of two glacial valleys in the Italian Alps, known since centuries for the particular warm microclimate and its botanical-archeological park. The characterization from a thermophysical point of view is done both with laboratory tests exploiting infrared thermography coupled with petro-physical characterization and in the field long-term thermographic survey.Methods based on infrared thermography allowed to measure thermal diffusivity, conductance and specific heat. The measurements animals to evaluate the use of thermographic methods for the early detection of falling rocks and to study the characteristics of temperate local microclimat

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Unnikrishnakurup, S., J. Zheng, C. Manzano et CY Ngo. « Numerical and Experimental investigations of pulsed infrared Thermography for damage detection in Honeycomb Sandwich Composites ». Dans QIRT. QIRT Council, 2022. http://dx.doi.org/10.21611/qirt.2022.2025.

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This paper investigates the inspection and testing of internal structural damages in Honeycomb Sandwich composites by means of pulsed thermography experiments. The voids, delamination flaws, and epoxy-filled defects are also studied using numerical simulation in 3D FEM using COMSOL Multiphysics. Pulse thermography data processing methods such as Thermographic Signal Reconstruction (TSR) techniques, Pulse Phase Thermography (PPT) and Principle Component Analysis(PCA) were used to analyse the simulated and experimental data. Standard samples made of Nomex and fiberglass cores, both of which had identical flaws, were studied. The potted core defect, filled with epoxy, and the pillow insert (delamination)located in the front face plate of the composite could be clearly identified from the thermograms as well as the TSR results.On the contrary, the machined core defects showed very minute contrast and are more diﬀicult to be identified

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Rahman, Md Ashiqur, Javier Becerril, Dipannita Ghosh, Nazmul Islam et Ali Ashraf. « Non-Destructive Infrared Thermographic Curing Analysis of Polymer Composites ». Dans ASME 2022 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/imece2022-96116.

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Abstract Infrared (IR) thermography is a non-contact method of measuring temperature that analyzes the infrared radiation emitted by an object. Properties of polymer composites are heavily influenced by the filler material, filler size, and filler dispersion, and thus thermographic analysis can be a useful tool to determine the curing and filler dispersion. In this study, we investigated the curing mechanisms of polymer composites at the microscale by capturing real-time temperature using an IR Thermal Camera. Silicone polymers with fillers of Graphene, Graphite powder, Graphite flake, and Molybdenum disulfide (MoS2) were subsequently poured into a customized 3D printed mold for thermography. The nanocomposites were microscopically heated with a Nichrome resistance wire, and real-time surface temperatures were measured using different Softwares. This infrared thermal camera divides the target area into 640 × 480 pixels, allowing measurement and analysis of the sample with a resolution of 65 micrometers. Depending on the filler material, the temperature rises to a certain maximum point before curing, and once curing is complete, polymer composites exhibit a rapid temperature change indicating a transition from viscous fluid to solid. MoS2, Polydimethylsiloxane (PDMS) without filler, and PDMS with larger filler are ranked in order of maximum constant temperature. PDMS (without filler) cures in 500s, while PDMS-Graphene and PDMS Graphite Powder cure in about 800s. The curing time for PDMS Graphite flake is slightly longer (950s), while MoS2 is around 520s. Therefore, this technique can indicate the influence of fillers on the curing of composites at the microscale, which is difficult to achieve by conventional methods such as differential scanning calorimetry. This nondestructive, low-cost, fast infrared thermography can be used to analyze the properties of polymer composites with different fillers and dispersion qualities in a variety of applications including precision additive manufacturing and quality control of curable composite inks.

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Chanmugam, Arjun, Rajeev Hatwar et Cila Herman. « Thermal Analysis of Cancerous Breast Model ». Dans ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-88244.

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Breast cancer is one of the most common and dangerous cancers. Subsurface breast cancer lesions generate more heat and have increased blood supply when compared to healthy tissue, and this temperature rise is mirrored in the skin surface temperature. The rise in temperature on the skin surface, caused by the cancerous lesion, can be measured noninvasively using infrared thermography, which can be used as a diagnostic tool to detect the presence of a lesion. However, its diagnostic ability is limited when image interpretation relies on qualitative principles. In this study, we present a quantitative thermal analysis of breast cancer using a 3D computational model of the breast. The COMSOL FEM software was used to carry out the analysis. The effect of various parameters (tumor size, location, metabolic heat generation and blood perfusion rate) on the surface temperature distribution (which can be measured with infrared thermography) has been analyzed. Key defining features of the surface temperature profile have been identified, which can be used to estimate the size and location of the tumor based on (measured) surface temperature data. In addition, we employed a dynamic cooling process, to analyze surface temperature distributions during cooling and thermal recovery as a function of time. In this study, the effect of the cooling temperature on the enhancement of the temperature differences between normal tissue and cancerous lesions is evaluated. This study demonstrates that a quantification of temperature distributions by computational modeling, combined with thermographic imaging and dynamic cooling can be an important tool in the early detection of breast cancer.

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Reynolds, W. N. « T.S.A. and Thermography ». Dans Stress Analysis by Thermoelastic Techniques, sous la direction de B. C. Gasper. SPIE, 1987. http://dx.doi.org/10.1117/12.937898.

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Fond, Benoit, Christopher Abram et Frank Beyrau. « Thermographic Particle Image Velocimetry ». Dans Laser Applications to Chemical, Security and Environmental Analysis. Washington, D.C. : OSA, 2014. http://dx.doi.org/10.1364/lacsea.2014.lm1d.1.

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Singh, Kaushlendra, Mark Risse, K. C. Das et John Worley. « Determination of Composition of Cellulose and Lignin Mixtures Using Thermo Gravimetric Analysis (TGA) ». Dans 15th Annual North American Waste-to-Energy Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/nawtec15-3222.

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The proportional composition of cellulose, hemicellulose, lignin and minerals in a biomass plays a significant role in the proportion of pyrolysis products (bio-oil, char, and gases). Traditionally, the composition of biomass is chemically determined, which is a time consuming process. This paper presents the results of a preliminary investigation of a method using thermo-gravimetric analysis for predicting the fraction of cellulose and lignin in lignin-cellulose mixtures. The concept is based on a newly developed theory of Pyrolytic Unit Thermographs (PUT). The Pyrolytic Unit Thermograph (PUT) is a thermograph showing rate of change of biomass weight with respect to temperature for a unit weight loss. These PUTs were used as input for two predictive mathematical procedures that minimize noise to predict the fractional composition in unknown lignin-cellulose mixtures. The first model used linear correlations between cellulose/lignin content and peak decomposition rate while the second method used a system of linear equations. Results showed that both models predicted the composition of lignin-cellulose mixture within 7 to 18% of measured value. The promising results of this preliminary study will certainly motivate further refinement of this method through advanced research.

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Warren, Peter, Jason Williams, Paul Zombo et Ranajay Ghosh. « Investigation of an Advanced Acoustic Based Nondestructive Evaluation Method ». Dans ASME Turbo Expo 2019 : Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90260.

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Abstract Analysis of the mechanics of an acoustic thermographic non-destructive evaluation (NDE) and its extension to an advanced acoustic wave generation is the topic of this paper. NDE is among the most effective and powerful materials evaluation and prognosis tool available for high performance turbomachines which increasingly incorporate advanced materials and extreme operating conditions. In the current work we investigate the mechanism of heat generation in acoustic thermography in detail using a combination of computation and experiments. We use the validated model to carry out a model based evaluation of an advanced thermographic based acoustic NDE method which if successful this technique could revolutionize the ease of data gathering and data monitoring. We address many of the challenges typical of this type of system, principal among them are crack detection threshold, signature quality and the effect of defect interactions. We use experiments and finite element (FE) based numerical simulation to evaluate the proposed method and draw conclusions on the viability for future extension and integration with other digital technologies for health monitoring. Our FE model is capable of capturing various distinct sources of emission signatures from defects and we validate it with a traditional acoustic method. We also use this method to determine the magnitude of the different sources of heat generation during an acoustic excitation. Defects formed through industrial operation as well as defects formed through artificial manufacturing methods were analyzed and compared.

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Dutton, T. W., L. R. Pate et D. K. Hollingsworth. « Liquid Crystal Imaging of Surface-Tension-Driven Convection ». Dans ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1430.

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Abstract Surface tension forces can drive fluid motion within thin liquid layers with a free surface. Spatial variations in the temperature of the free surface create surface tractions that drive cellular motions. The cells are most commonly hexagonal in shape and they scale on the thickness of the fluid layer. This investigation documents the formation of cells in the liquid film in the presence of a uniform-heat-flux lower boundary condition. Liquid crystal thermography was used to image the cells and measure the temperature distribution on the lower surface of the liquid layer. A 1.1-mm deep pool of silicone oil was supported on a 50-μm-thick electrically heated metal foil. The oil was retained inside an independently heated acrylic ring mounted on the top surface of the foil, and a dry-ice cooling plate served as the low-temperature sink above the free surface of the oil. Color images of hexagonal convection cells were captured using liquid crystal thermography and a digital image acquisition and processing system. The temperature distribution inside a typical cell was measured using thermographic image analysis. Experimental issues such as the use of an independently heated retaining ring to control the height of the liquid film, and the utility of a flux-based Marangoni number are discussed.

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Paiva, Vitor Eboli L., G. L. G. Gonzáles, R. D. Vieira, J. E. Maneschy, R. B. Vieira et J. L. F. Freire. « Fatigue Monitoring of a Dented Piping Specimen Using Infrared Thermography ». Dans ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-84597.

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The present paper combines the fatigue properties rapid assessment approach using uniaxial test specimens proposed by Risitano and co-workers with the nondestructive testing (NDT) inspection approach proposed by Sakagami and co-workers to monitor the onset of fatigue in a reduced scale pipeline test specimen that was previously dented and subsequently subjected to cyclic pressure loading. In addition to the use of the conventional infrared (IR) thermographic method, the present paper uses a self-reference lock-in IR thermography method based on Thermoelastic Stress Analysis (TSA) and its deviation from traditional applications due to the presence of fatigue damage and plastic strains. The paper concludes showing that is possible to predict and monitor and detect fatigue initiation and damage using IR and TSA techniques applied to the thin wall pipe loaded under cyclic hydrostatic pressure.

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Rapports d'organisations sur le sujet "Thermographie – analyse"

Dimova-Gabrovska, Mariana. Thermographic Assessment of Structural Analysis in Patients with Temporomandibular Disorders. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, mai 2018. http://dx.doi.org/10.7546/crabs.2018.05.17.

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Mukhopadhyaya, Phalguni, Milad Mahmoodzadeh, Voytek Gretka et Ivan Lee. Use of Thermography for Quantitative Building Envelope Thermal Performance Analysis. Department of the Built Environment, 2023. http://dx.doi.org/10.54337/aau541985169.

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Lee, Khalil, Helen Koo et David Pascoe. Radiant Heat Transfer Capabilities of Activewear Fabrics Analyzed by Infrared Thermography. Ames : Iowa State University, Digital Repository, 2013. http://dx.doi.org/10.31274/itaa_proceedings-180814-889.

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