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Статті в журналах з теми "Thermographie inductive":
1
Liu, Xingliang, Guiyun Tian, Yu Chen, Haoze Luo, Jian Zhang, and Wuhua Li. "Non-Contact Degradation Evaluation for IGBT Modules Using Eddy Current Pulsed Thermography Approach." Energies 13, no. 10 (May 21, 2020): 2613. http://dx.doi.org/10.3390/en13102613.
Анотація:
In this paper, a non-contact degradation evaluation method for insulated gate bipolar transistor (IGBT) modules is proposed based on eddy current pulsed thermography approach. In non-contact heat excitation procedures, a high-power induction heater is introduced to generate heat excitation in IGBT modules. The thermographs of the whole temperature mapping are recorded non-invasively by an IR camera. As a result, the joint degradation of IGBT modules can be evaluated by the transient thermal response curves derived from the recorded thermographs. Firstly, the non-destructive evaluation principle of the eddy current pulsed thermography (ECPT) system for an IGBT module with a heat sink is introduced. A 3D simulation module is built with physical parameters in ANSYS simulations, and then thermal propagation behavior considering the degradation impact is investigated. An experimental ECPT system is set up to verify the effectiveness of the proposed method. The experimental results show that the delay time to peak temperature can be extracted and treated as an effective indicative feature of joint degradation.
2
Mendioroz, Arantza, Lorenzo Fuggiano, Pablo Venegas, Idurre Sáez de Ocáriz, Umberto Galietti, and Agustín Salazar. "Characterizing Subsurface Rectangular Tilted Heat Sources Using Inductive Thermography." Applied Sciences 10, no. 16 (August 6, 2020): 5444. http://dx.doi.org/10.3390/app10165444.
Анотація:
In this study, we characterize the lateral dimension, depth, and inclination of buried tilted rectangular heat sources from time domain temperature data measured at the surface. The heat sources are representative for planar defects that emit heat in thermographic tests with internal burst excitation. We present a semi-analytical expression for the evolution of the surface temperature distribution. The emitted flux, dimensions and inclination of the heat source are determined by fitting the model to two perpendicular surface temperature profiles and the temperature history at one point of the surface. We show that the sensitivity of the data to the geometrical parameters of the heat source decreases as the angle it makes with the surface increases. The study also shows that the optimum duration of the excitation corresponds to a thermal diffusion length covering the distance from the surface to the deepest end of the heat source. The accuracy and precision of the results for different noise levels and inclinations have been tested by fitting the model to synthetic data with added noise. Fittings of experimental induction thermography data on 3D printed photo-polymeric resin samples containing calibrated Cu slabs confirm that it is possible to characterize tilted rectangular heat sources from surface temperature data.
3
Mahami, Amine, Chemseddine Rahmoune, Toufik Bettahar, and Djamel Benazzouz. "Induction motor condition monitoring using infrared thermography imaging and ensemble learning techniques." Advances in Mechanical Engineering 13, no. 11 (November 2021): 168781402110609. http://dx.doi.org/10.1177/16878140211060956.
Анотація:
In this paper, a novel noncontact and nonintrusive framework experimental method is used for the monitoring and the diagnosis of a three phase’s induction motor faults based on an infrared thermography technique (IRT). The basic structure of this work begins with this applying IRT to obtain a thermograph of the considered machine. Then, bag-of-visual-word (BoVW) is used to extract the fault features with Speeded-Up Robust Features (SURF) detector and descriptor from the IRT images. Finally, various faults patterns in the induction motor are automatically identified using an ensemble learning called Extremely Randomized Tree (ERT). The proposed method effectiveness is evaluated based on the experimental IRT images, and the diagnosis results show its capacity and that it can be considered as a powerful diagnostic tool with a high classification accuracy and stability compared to other previously used methods.
4
Naveenkumar, Pushpalatha, and Sudha Mohanram. "An Empirical Performance Assessment of Infrared Thermography for Real-time Monitoring of Electrical Systems in the Coco Fibre Industry." Proceedings of the Bulgarian Academy of Sciences 76, no. 4 (April 30, 2023): 597–604. http://dx.doi.org/10.7546/crabs.2023.04.12.
Анотація:
The quality of the electrical network, which includes MV panels, DBs, MCBs, sub-circuits with fuse units, and electrical motors for machine tools, determines production in any sector. Most drive systems employ inductionmotors. System temperature indicates health. Excess temperature is rarely detected due to breakdown. This case study presents real-time data for a leading coir industry from each electrical circuit and motor in several machine tools. Every section is thermographed and compared to the allowed temperature range. Thermographic analysis is non-contact and uses fewer meters and instruments. A harmonic analyzer measures THD using data from the full testing period. Modern energy audits save 10–15% on energy. Suggestions include modest restructuring of electrical network load distribution, little investment in capacitor banks in each section of induction motors, and thorough analysis and corrective measures based on customer needs.
5
Kosec, Borut, Blaž Karpe, Mirko Gojić, Zorana Tanasić, Gorazd Kosec, Aco Antić, and Aleš Nagode. "Inductive Heating and Quenching of Planetary Shafts for Diesel Engine Starters." Advanced Technologies & Materials 48, no. 2 (December 2, 2023): 55–61. http://dx.doi.org/10.24867/atm-2023-2-003.
Анотація:
High mechanical and temperature cyclic loading of the final products for automotive, transport, construction and agriculture mechanization industry, demands sufficient mechanical properties of all of their components during its exploitation. Majority of the components is made of steel, by different cold forming processes. Their main demanded characteristics are surface wear resistance and fatigue strength under pulsating stress in combination with cyclic temperature loading, which could be achieved only by appropriate heat treatment. The efficiency of the combined inductive heating and water quenching heat treatment and quality of the planetary shafts were analyzed, with the use of thermographic analysis, hardness measurements, and metallographic examination. Combination of inductive heating and water quenching is the most effective heat treatment process of carbon steel planetary shafts for the diesel engine starters. Long life span of carbon steel planetary shafts it’s essential for their economical production. The replacement of starter is expensive from both: money and working time point of view. Surface temperature measurements during the inductive heating process were performed in the industrial environment. The intensity and homogeneity of the planetary shaft surface temperature field was measured by thermographic camera. On the base of theoretical knowledge and measurements, a mathematical model for temperature conditions determination in the shaft during the entire process of heating and quenching was carried out, and used for analyses and optimization of planetary shafts induction hardening process.
6
Tuschl, Christoph, Beate Oswald-Tranta, and Sven Eck. "Scanning Inductive Thermographic Surface Defect Inspection of Long Flat or Curved Work-Pieces Using Rectification Targets." Applied Sciences 12, no. 12 (June 8, 2022): 5851. http://dx.doi.org/10.3390/app12125851.
Анотація:
Inductive thermography is an NDT method, which can be excellently used to inspect long metallic specimens (such as railway tracks) to detect surface defects. Aiming at the inspection of railway tracks in service with a movable setup, the method had to be advanced from a stationary application to a scanning setup. This work presents methods for using calibration targets for rectification, in order to improve the quality of the resulting images. Two scanning techniques are presented for detecting different types of rolling contact fatigue (RCF) defects on rail pieces. In the case of the first method, separate stationary inductive pulsed measurements are carried out for the segments of a long sample and the results are stitched together to one panoramic image of the whole specimen (“stop-and-go”). Since the surface of the rail piece is curved, rectification of the surface with a flexible grid is necessary to generate seamless panoramic images. In the case of the second method, a specimen is moved with constant speed underneath the induction coil. For the detection of shallow surface cracks, the infrared camera has to have a view of the surface during the heating; therefore, the camera is placed behind the coil but tilted towards a position below the induction coil. In order to be able to evaluate phase images from the temporal temperature change, a checkerboard grid as a rectification target is used. It is also analyzed how the chosen IR camera frame rate and the motion speed affect the scanning result.
7
Tuschl, Christoph, Beate Oswald-Tranta, and Sven Eck. "Inductive Thermography as Non-Destructive Testing for Railway Rails." Applied Sciences 11, no. 3 (January 22, 2021): 1003. http://dx.doi.org/10.3390/app11031003.
Анотація:
Inductive thermography is a non-destructive testing method, whereby the specimen is slightly heated with a short heating pulse (0.1–1 s) and the temperature change on the surface is recorded with an infrared (IR) camera. Eddy current is induced by means of high frequency (HF) magnetic field in the surface ‘skin’ of the specimen. Since surface cracks disturb the eddy current distribution and the heat diffusion, they become visible in the IR images. Head checks and squats are specific types of damage in railway rails related to rolling contact fatigue (RCF). Inductive thermography can be excellently used to detect head checks and squats on rails, and the method is also applicable for characterizing individual cracks as well as crack networks. Several rail pieces with head checks, with artificial electrical discharge-machining (EDM)-cuts and with a squat defect were inspected using inductive thermography. Aiming towards rail inspection of the track, 1 m long rail pieces were inspected in two different ways: first via a ‘stop-and-go’ technique, through which their subsequent images are merged together into a panorama image, and secondly via scanning during a continuous movement of the rail. The advantages and disadvantages of both methods are compared and analyzed. Special image processing tools were developed to automatically fully characterize the rail defects (average crack angle, distance between cracks and average crack length) in the recorded IR images. Additionally, finite element simulations were used to investigate the effect of the measurement setup and of the crack parameters, in order to optimize the experiments.
8
Xia, Hui, Erlong Li, Jianbo Wu, Qiao Qiu, Jie Wang, Jiqing Luo, and Sha He. "Scanning induction thermography for subsurface defect orientation detection and depth quantification." International Journal of Applied Electromagnetics and Mechanics 64, no. 1-4 (December 10, 2020): 869–77. http://dx.doi.org/10.3233/jae-209400.
Анотація:
Pulsed eddy current thermography (PECT) and eddy current lock-in thermography (ECLIT) are non-destructive testing (NDT) techniques of high promising and interest in subsurface defect detection. In the previous researches, the induction coil was set above the defect region and it always parallel to the defect orientation. However, the location and orientation of subsurface defects cannot be determined before detection. Therefore, the scanning induction thermography (SIT) based on dynamic thermography is proposed by some researchers to localize and distinguish the subsurface defects. Still, the main challenges of SIT are how to detect the subsurface defect orientation and quantify the depth. So that, the quantitative analysis in SIT with the new feature extraction methods was investigated and improved to detect the subsurface defect orientation and quantify the defect depth within 5 mm by using experimental studies.
9
Cheng, Yuhua, Libing Bai, Fan Yang, Yifan Chen, Shenhua Jiang, and Chun Yin. "Stainless Steel Weld Defect Detection Using Pulsed Inductive Thermography." IEEE Transactions on Applied Superconductivity 26, no. 7 (October 2016): 1–4. http://dx.doi.org/10.1109/tasc.2016.2582662.
10
Zuo, Xianzhang, Benchu Song, Yongjiang Hu, and Yunze He. "Detection Mechanism of Parallel Defect using Scanning Inductive Thermography." IOP Conference Series: Materials Science and Engineering 207 (June 2017): 012090. http://dx.doi.org/10.1088/1757-899x/207/1/012090.
Дисертації з теми "Thermographie inductive":
1
Dirahoui, Walid. "Caractérisations numérique et expérimentale de défauts structurels dans les rubans supraconducteurs multicouches par thermographie inductive." Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0124.
Анотація:
Les travaux de recherche menés dans le cadre cette thèse concernent la caractérisation de défauts structurels, à température ambiante, dans les rubans supraconducteurs de deuxième génération, dans une démarche contrôle de qualité et de fiabilité. Dans un premier temps, une modélisation magnétothermique bidimensionnel a été développée pour étudier la possibilité d'appliquer le contrôle par thermographie inductive sur les rubans SHT-2G. Par la suite, un banc expérimental est confectionné pour le contrôle des défauts structurels dans les rubans SHT-2G où un inducteur tournant a été préféré aux inducteurs alimentés par des courants afin d'éviter la perturbation thermique générées par ces derniers. Les mesures expérimentales sont soutenues par une modélisation tridimensionnelle à la fois pour des fins de validation mais aussi pour simuler des situations qui ne peuvent pas être reproduites expérimentalement. Le calcul des courants induits dans le ruban SHT-2G, est basé sur une formulation intégro-différentielle en termes de potentiel vecteur électrique, tandis que le champ magnétique source, créé par les aimants tournants, est calculé en utilisant le modèle de charges magnétiques surfaciques. Un modèle thermique, basé sur la méthode des différences finies, est associé au modèle électromagnétique pour le calcul de la température à la surface des échantillons inspectés. Plusieurs types de défauts sont caractérisés numériquement et expérimentalement. Enfin, une évaluation des contraintes mécaniques, générées par la rotation de la roue aimantée dans les rubans inspectés, est effectuéeThe research work carried out in this thesis concerns the characterization of structural defects, at room temperature, in the second generation superconducting tapes, in a quality control and reliability control approach. First, a two-dimensional magnetothermal model has been developed to study the possibility of applying the eddy current thermography for the control of the 2G-HTS tapes. Then, an experimental bench is built for the control of structural defects in the 2G-HTS tapes where a rotating inductor has been preferred to current supplied inductors in order to avoid the thermal disturbance generated by the latter. The experimental measurements are supported by three-dimensional modeling both for validation purposes and to simulate situations that cannot be reproduced experimentally. The calculation of the eddy currents in the 2G-HTS tapes is based on an integro-differential formulation in terms of electric vector potential, while the source magnetic field, created by the rotating magnetic wheel, is calculated using the magnetic surface charge model. A thermal model, based on the finite difference method, is associated to the electromagnetic model for the calculation of the surface temperature of the inspected samples. Several types of defects are characterized numerically and experimentally. Finally, an evaluation of the mechanical stresses, generated by the rotation of the magnetized wheel in the inspected tapes, is performed
2
Azzabi, Zouraq Brahim. "Optimisation du procédé de contrôle non destructif par thermographie inductive pour des applications du domaine nucléaire." Thesis, Nantes, 2019. http://www.theses.fr/2019NANT4023/document.
Анотація:
Les travaux de cette thèse traitent d’une technique de contrôle non destructif (CND) novatrice et de son adaptation au domaine du nucléaire civil. L’outil numérique est utilisé à cette fin. Une présentation exhaustive des modèles numériques adaptés à la problématique est tout d’abord faite. Ces outils sont par la suite implémentés et leurs performances comparées. Ceci a permis de mettre en place un outil numérique rapide et capable de prendre en comptes différentes contraintes de modélisation. Il s’agit plus essentiellement de la prise en compte du circuit, d’alimentation du système de chauffe, de la modélisation des régions à effet de peau prononcé, ainsi que la modélisation des défauts fins. Ceci est suivi par une validation expérimentale des performances numériques. L’outil implémenté est validé et exploité dans le cadre d’une démarche d’évaluation de fiabilité basé sur une approche MAPOD. Dans ce cadre tout un système de tirage de données d’entrée et de gestion de données de sortie est établi. Le fruit de ceci est un outil logiciel fiable et rapide dédié à l’évaluation de la sensibilité de la technique thermo-inductiveThe work of this thesis deals with an innovative non-destructive testing (NDT) technique and its adaptation to the civil nuclear field. The numerical tool is used for this purpose. An exhaustive presentation of numerical models adapted to our problematic is made at first. These tools are then implemented and their performance compared. This made it possible to set up a fast digital tool capable of taking into account different modeling constraints such as circuit coupling, modeling of pronounced skineffect regions, as well as modeling of thin defects. This was followed by an experimental validation of the performances. Once the tool implemented and validated, it was exploited as part of a reliability assessment approach based on a MAPOD approach. In this context, an entire system for drawing input data and managing output data will be established. The result of this is a reliable and fast software tool dedicated to the evaluation of the sensibility of the thermoinductive technique
3
Ba, Abdoulaye. "Développement d’une plateforme de modélisation multi-physique et multi-échelle des techniques de CND des matériaux composites stratifiés par les techniques des courants de Foucault et de thermographie inductive." Thesis, Nantes, 2021. http://www.theses.fr/2021NANT4001.
Анотація:
À différents stades du cycle de vie du matériau composite, les méthodes de Contrôles Non Destructifs (CND) permettent de caractériser son état d’intégrité. Elles jouent un rôle indispensable dans le contrôle de la qualité et dans la gestion des risques. Les principales exigences du CND sont la capacité de détecter et de discriminer les défauts de différentes natures, le dimensionnement précis des défauts, l’inspection et l’interprétation rapide et fiable, la capacité d’inspection des structures de formes complexes. En regard à ces besoins, les matériaux composites de natures très complexes (hétérogénéité, anisotropie forte et multi-couches) posent encore des problèmes pour les méthodes actuelles de CND. Les travaux présentés dans cette thèse s’inscrivent dans le cadre du projet européen NDTonAIR et portent sur le développement d’une plateforme de modélisation multi-physique et multi-échelle pour le CND des matériaux composites à fibres de carbone par les techniques des courants de Foucault et thermographie inductive. Ils visent à améliorer les codes de calcul par éléments finis en 3D de l’IREENA. Le développement de tels outils de simulation se heurte à des problématiques de modélisation difficiles liées notamment à la nature complexe des structures des composites et la nécessité d’utiliser des fréquences électromagnétiques élevées (jusqu’à quelques Mégahertz) afin d’injecter suffisamment de puissance dans ces matériaux très peu conducteurs. Dans les précédents travaux à l’IREENA, le temps de calcul des simulations est important, lié à la présence de conducteurs massifs exposés à un champ électromagnétique de fréquence élevée. C’est dans cette logique que nous proposons dans ce travail de thèse, une approche par éléments finis en 3D associés aux impédances de surface avec courant et tension imposés, dans le but de réduire les temps de simulations. Les outils numériques développés, ont été validés par une confrontation des résultats de simulations avec une solution analytique. Ils permettent aussi de concevoir un inducteur massif. L’identification de l’orientation des fibres de carbone dans un composite par la technique des courants de Foucault est également exploitée dans ces travauxAt different stages in the life cycle of the composite material, Non-Destructive Testing (NDT) methods are used to characterize its state of integrity. They play a vital role in the quality control and risk management. The main requirements of NDT are the ability to detect and discriminate defects of different types, precise dimensioning of defects, fast and reliable inspection and interpretation, and the ability to inspect structures of complex shapes. With regard to these requirements, composite materials of a very complex nature (heterogeneity, strong anisotropy and multi-layers) still pose problems for actual NDT methods. The work presented in this thesis is part of the European project NDTonAIR and deal with the development of a multi-physic and multi-scale modelling platform for the NDT of carbon fibers composite materials using eddy currents and induction thermography techniques. They aim to improve IREENA's 3D numerical software. The development of such simulation tools comes up against difficult modelling problems linked in particular to the complex nature of composite structures and the need to use high electromagnetic frequencies (up to a few MegaHertz) in order to induce sufficient power into these very low conducting materials. In previous work at IREENA, the simulation time was important, linked to the presence of massive conductors exposed to a high frequency electromagnetic field. It is in this context that we propose in this work, a 3D finite element method associated with surface impedance boundary condition with imposed current and voltage, in order to reduce the simulation times. The implemented simulation tools have been validated by comparisons with an analytical solution. They also make possible the design of a massive coil. The identification of the orientation of carbon fibers in a composite plate using eddy current technique is also investigated in this work
4
Bui, Huu Kien. "Contribution à la modélisation multiphysique des matériaux composites stratifié : application au CND thermo-inductifs." Nantes, 2014. https://archive.bu.univ-nantes.fr/pollux/show/show?id=61cbe9e0-41bc-4278-a974-e1bc8f8eb0c7.
Анотація:
Grâce à leurs excellentes performances mécaniques, l'intérêt des composites à fibres de carbone n'a pas cessé de croître ces dernières décennies. Cependant, le développement à grande échelle de ces matériaux passe par une amélioration des procédés utilisés pendant les différentes étapes du cycle de vie (élaboration, formage, assemblage, contrôle, recyclage). À différents stades du cycle de vie du matériau, les méthodes de Contrôle Non Destructif (CND) permettent de caractériser l'état d'intégrité du matériau. Elles jouent un rôle indispensable dans le contrôle de la qualité et dans la gestion des risques. Le CND par thermographie inductive, basé sur les mesures de l'effet thermique des courants de Foucault dans le matériau, est une technique prometteuse pour ce type de matériau. Le développement de cette méthode et la conception de dispositifs nécessitent un outil de simulation multiphysique électromagnétique et thermique. Le développement d'un tel modèle se heurte aux problématiques de l'évaluation des courants induits dans des régions minces et fortement anisotropes. Les outils de simulation développés durant cette thèse permettent d'avoir des temps de calcul raisonnables tout en conservant des précisions acceptables sur les solutions numériques. Ces outils ont été validés par des comparaisons avec des essais expérimentaux et permettent ainsi d'évaluer précisément les performances de cette technique de CNDThanks to their excellent mechanical performance, the use of carbon fiber composites has been growing in recent decades. However, the large-scale development of these materials depends on the improvements of the processes during the various stages of their whole life cycle (eg. Producing, forming, assembly, inspection, recycling). At various stages of the life cycle of the material, nondestructive testing (NDT) methods can be used to characterize the health state of the material. They play a vital role in the quality control and risk management. Induction thermography NDT based on the measurement of thermal effect of the eddy currents in the material is a promising technique for this type of material. The development of this method requires multiphysics electromagnetic – thermal modeling. The model must deal with some numerical issues of thin regions of strong anisotropy. The implemented simulation tools allow reasonable computational time while retaining the desirable accuracy of numerical solutions. They are validated by comparisons with experimental measures. These tools allow accurate assessment of the performance of induction thermography technique
5
Ramdane, Brahim. "Contribution à la modélisation tridimensionnelle de la technique thermo-inductive de contrôle non destructif : développement d'un outil de conception, d'analyse et d'aide à la décision." Nantes, 2009. http://archive.bu.univ-nantes.fr/pollux/show.action?id=340deb67-d3d1-4e13-b39d-aed8a71021b2.
Анотація:
La complexité grandissante des pièces fabriquées et les exigences croissantes en terme de sûreté de fonctionnement conduisent à mettre en place de nouveaux procédés de CND. Dans ce travail, une nouvelle méthode appelée technique thermo-inductive a été développée et étudiée. C'est une combinaison et alternative intéressante du CND par courant de Foucault et de la thermographie infrarouge. Cette méthode est basée sur l'utilisation conjointe des phénomènes électromagnétique et thermique pour avoir une bonne sélectivité des défauts. La pièce inspectée est chauffée par induction et la présence du défaut est révélée par la perturbation des courants induits et du champ de température qui se propage à la surface et peut être ainsi détecté par une caméra infrarouge. L'étude porte sur la conception, la caractérisation et l'optimisation de cette nouvelle méthode. Dans cet objectif, un logiciel de simulation numérique 3D basé sur la méthode des éléments finis décrit dans l’espace des éléments de Whitney a été développé dans un environnement Matlab®. Le comportement non linéaire et la nature anisotropique des matériaux sont pris en compte par le code développé. Cet outil est bien adapté à la modélisation des défauts grâce aux éléments coques implémentés. Une estimation fiable des caractéristiques géométriques de défauts est obtenue par l’analyse des résultats à l’aide de deux paramètres de discrimination complémentaires que sont les contrastes d'amplitude et de phase. Ces analyses complétées par des essais expérimentaux montrent que la qualité de la détection des défauts est fortement influencée par la forme de l’inducteur, les caractéristiques physiques de la pièce et des défauts, la fréquence électromagnétique et le temps de chauffage et d’acquisition. Une comparaison de la technique thermoinductive avec la thermographie infrarouge classique montre que cette nouvelle technique est plus efficace en terme de détection de défauts. Des applications industrielles typiques du CND dans les secteurs automobile et aéronautique ont été étudiées et mises en oeuvre. Les résultats ont montré la capacité d'adaptation et la pertinence de la technique pour une potentielle intégration dans un processus industrielThe growing complexity of manufactured pieces and the increasing need of reliability lead to development of new processes of NDT. In this work, a new method called the thermo-inductive technique has been developed and studied. It is an interesting alternative of eddy current NDT and infrared thermography. This method is based on the use of both electromagnetic and thermal phenomena in order to obtain a good selectivity of defects. The piece is heated by induction and the presence of default is detected by the perturbation of eddy currents and temperature field which propagates at the piece surface and can be observed by an infra red camera. The study focuses on the design, characterization and optimization of the new method. In this perspective, a 3D numerical coupled software using Whitney’s elements has been developed under Matlab environment. The non linear behaviour and the anisotropy of the different physical properties of materials are taken into account. This tool is well suited for modeling defects thanks to the shell elements implemented in it. A reliable estimation of defect characteristics is obtained by analysing the results using two complementary discrimination parameters which are the temperature and phase contrast. Theses analyses completed by experimental results show that the quality of detection depend largely on the inductor form, the physical properties of the piece, the electromagnetic frequency and the heating and sampling time. A comparison of the thermo-inductive technique with the conventional infrared thermography method showed that the new technique is more efficient in terms of defect detection. Some typical industrial applications of NDT in the aeronautic and automotive sectors have been studied and implemented. The results have demonstrated the relevance of the thermo-inductive technique and its adaptability to a possible integration into an industrial process
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Du, Tao. "Thermographie infrarouge active par induction électromagnétique. : application à l'auscultation d'éléments en béton renforcé." Thesis, Artois, 2010. http://www.theses.fr/2010ARTO0203/document.
Анотація:
Les enjeux économiques et sécuritaires majeurs portant sur l'évaluation de la pérennité des systèmes de précontrainte dans les ouvrages d'art conduisent au développement de nouvelles méthodes d'auscultation. Ces travaux représentent la contribution du LGCgE au programme national de recherche ANR ACTENA sur l'auscultation des câbles tendus non-accessibles. Les objectifs de ce travail sont la détermination du tracé des câbles de précontrainte et la détection des zones de défauts d'injection par thermographie infrarouge active. Le premier chapitre rappelle le contexte de cette étude, ainsi que les travaux antérieurs. L'introduction d'un mode de chauffage par induction conduit à une indétermination sur la présence éventuelle de défaut. Afin de lever cet artefact, le deuxième chapitre introduit une méthode originale de traitement fréquentiel des thermogrammes bruts basée sur une approche systémique dans le domaine fréquentiel. Une modélisation par éléments finis des spécimens expérimentaux permet d'étudier la diffusion et d'élaborer les paramètres expérimentaux. Le troisième chapitre expose les résultats expérimentaux obtenus sur trois spécimens de poutres. La procédure de traitement fréquentiel est appliquée aux séries de thermogrammes bruts obtenus. Les résultats sont discutés et mettent en avant l'intérêt des images de phase. Une approche quantitative est appliquée aux résultats de thermographie infrarouge dans le quatrième chapitre. La méthode d'inversion présentée permet la détermination de la diffusivité thermique du béton d'enrobage ainsi que son épaisseurThe economical and security aspects of the durability of the prestressed concrete construction works lead to develop new non destructive testing methods. This work was developed within the framework of the ANR ACTENA French research project. The main arms are to contribute to the localization of prestressed tendon ducts or rebars and also to the detection of the poor filling defects. The context of this study and previous works are described in the chapter I. The introduction of an inductor heating provides a non uniformity of the heating. In order to avoid any misinterpretation of thermograms, a frequential method based on transfer functions is proposed in chapter II. A 3D numerical model of the experimental specimens is performed by finite element method. Chapter III shows experimental results for three concrete beam specimens. The frequential procedure is applied to the raw thermograms. The results are discussed and highlighted the interest of phase images. A quantitative approach is applied to infrared thermographical results in the chapter IV. Finally, an inverse method is proposed and allowed to the determination of thermal diffusivity and the thickness of the cover concrete
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Dragan, Razvan Gabriel. "Etudes sur le diagnostic des systèmes par thermographie infrarouge." Thesis, Artois, 2014. http://www.theses.fr/2014ARTO0207/document.
Анотація:
La thèse intitulée Études sur le diagnostic des systèmes par thermographie infrarouge propose des recherche théoriques et expérimentales dans un domaine complexe - le domaine des méthodes d’analyse non-destructive, spécialement la thermographie infrarouge utilisant des diverses sources d’excitation thermique: laser à CO2, lampes photographiques à halogène, sources électriques, micro-ondes et induction électromagnétique. L’analyse par thermographie infrarouge a été appliquée sur des divers systèmes soit du génie civil, soit de l’ingénierie médicale, dans le but de détecter des défauts internes et de surface, micro-fissures, des métaux inglobés, et, en même temps, l’analyse de leur influences dans le processus de transfert thermique. La thèse est structurée en six chapitres dont trois s’occupent de l’introduction, les objectifs de la recherche, les conclusions, les contributions originales et la valorisation des résultats (publies et contrats de recherches), ainsi que le développement futur du sujet de la thèse. Les trois chapitre suivants développent le sujet de la thèse en commençant avec une analyse rigoureuse de la littérature suivie par des études théoriques et expérimentaux sur l’analyse des systèmes par thermographie infrarouge : Le travail contient 181 figures et 12 tableaux à travers lesquels sont mis en évidence les résultats et des informations de haut niveau scientifique. Pendant le stage doctoral ont été réalisées et publies 10 articles dans les volumes des conférences internationales dont pour six le docteur est premier auteurThe thesis “Research concerning the systems analyze by infrared thermography” proposestheoretical and experimental researches în the very complex domain of non destructiveinspection methods, especially the infrared thermography – CO2 laser excitation, halogen lamps,electric heat sources, microwaves and electromagnetic induction. The thermographic analyzewas applied on materials used în constructions and biomedical engineering, the goal being theinternal and external defect detection, micro cracks, the detection of the embed metallic materialsand also the analysis of their thermal influence in the heat transfer process. The thesis isstructured in six chapters and, among them: three are concerned on introduction, thesisobjectives, conclusions, original contribution and thesis valorization (published papers andresearch grants)/future research directions. The next three develop, consistently, the thesissubject, beginning with critical analyze of the specialized literature that is followed bytheoretical study, and the experimental study of systems by infrared thermography. The PhDthesis contains 181 figures and 12 tables în which are illustrated and highlighted results andinformation with a high scientific degree. During the research program, the author elaborated andpublished 10 papers in the proceedings of different scientific events in Romania and abroad, insix of them being the first author
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Louaayou, Madani. "Contribution à l'étude du CND par thermographie infrarouge stimulé par l'induction magnétique." Nantes, 2007. http://www.theses.fr/2007NANT2119.
Анотація:
Les méthodes du Contrôle Non Destructif sont des techniques actives qui nécessitent une source d’énergie pour stimuler le spécimen. La réponse est alors recueillie par un capteur approprié pour accéder à l’état interne de la cible. Elles se différencient par le phénomène physique pour mise en oeuvre de la stimulation et/ou dans la perception de la réponse. Des techniques dites hybrides combinent deux ou plusieurs phénomènes physiques pour avoir une bonne sélectivité des défauts et plus d’informations concernant la cible. Dans ce travail, nous avons étudié une technique basée sur le comportement magnétothermique du spécimen suite à une sollicitation par un champ magnétique. Les courants induits et la distribution de la température peuvent être perturbés par la présence d’une anomalie qui se localise à la surface par un radiomètre infrarouge. L’analyse des résultats de l’inspection peut se faire, soit par l’évolution temporelle de la température soit ou par ses grandeurs annexes qui sont le module et la phase selon le régime de sollicitation, transitoire ou synchrone. Notre contribution consiste d’abord à déterminer l’apport de l’induction en CND par thermographie, puis le développement des modèles 1D, 2D et 3D pour mettre en évidence les domaines d’applications de cette technique. Des résultats des simulations ont été comparés avec des mesures dans le cas d’une plaque de composite à base de fibre de carboneThe non Destructive Testings are the active techniques which need an energy source to stimulate the specimen. The response is then analysed by an appropriate sensor to drive the internal state of the target. The hybrid techniques, combine two or several physical phenomena in order to have a good selectivity of the defect and to get more information about the target. In this work, we present a technique combining the electromagnetic and the thermal phenomena in conducting materials. In induction heating, the induced current and the temperature could be distributed at by the presence of the defect. This can be localised at the surface by an infrared sensor. The results may be analysed either by time evolution of the temperature or by its characteristics such as the phase or the amplitude in the case of sinusoidal excitation. Our contribution in this work is firstly the demonstration that the induction can stimulate the infrared NDT techniques. We develop then the 1D, 2D and 3D models to show the application domains of this technique. The results of the simulations are compared to experimental ones for a carbon fibre based composite shit
9
Roberts, Matthew Thomas. "Induction Infrared Thermography for Non-Destructive Evaluation of Alloy Sensitization." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/90668.
Анотація:
The sensitization of stainless steel describes the process by which a high-carbon steel alloy is heated above a certain threshold (either naturally or artificially) followed by a cooling period during which chromium (one of the elements most responsible for providing stainless steel with its corrosion-inhibiting properties) forms new compounds with the carbon present in the steel. With the chromium being taken from the parent material to form these compounds, the corrosion-resistant properties are compromised, which can lead to corrosion, cracking, and broader failure. Currently, the accepted techniques used to test for the presence of sensitization are qualitative and/or destructive in nature. Attempts have been made to non-destructively detect and characterize sensitization through various means, but all with mixed results. With the use of these high-carbon alloys in a range of industries, a comprehensive, in-place process is desirable.
This thesis will focus specifically on non-destructive evaluation of sensitization seen as a result of welding steel plates using induction infrared thermography (IIRT). This process uses an induction coil to generate heat within a sample whose resulting heat signature can then be detected with an infrared (IR) camera and analyzed. Previous IIRT experimental results have shown higher levels of heating in the HAZ when sensitization is present as it modifies the original microstructure of the material. New IIRT experiments have been conducted on both welded and unwelded 440C alloy samples to establish quantitative data on the heating profiles. These results (in conjunction with the appropriate experimental parameters) were then used to create a numerical model to replicate them. Despite some limitations in populating the model with accurate parameters, the results obtained were in good agreement with the experiments and provide a foundation for future work. Future work will focus on establishing a predictive tool that can detect and quantify the level of sensitization in an arbitrary steel sample in the field.Master of Science
The sensitization of stainless steel describes the process by which a high-carbon steel alloy is heated above a certain threshold (either naturally or artificially) followed by a cooling period during which chromium (one of the elements most responsible for providing stainless steel with its corrosion-inhibiting properties) forms new compounds with the carbon present in the steel. With the chromium being taken from the parent material to form these compounds, the corrosion-resistant properties are compromised, which can lead to corrosion, cracking, and broader failure. Currently, the accepted techniques used to test for the presence of sensitization are qualitative and/or destructive in nature. Attempts have been made to non-destructively detect and characterize sensitization through various means, but all with mixed results. With the use of these high-carbon alloys in a range of industries, a comprehensive, in-place process is desirable. This thesis will focus specifically on non-destructive evaluation of sensitization seen as a result of welding steel plates using induction infrared thermography (IIRT). This process uses an induction coil to generate heat within a sample whose resulting heat signature can then be detected with an infrared (IR) camera and analyzed. Previous IIRT experimental results have shown higher levels of heating in the HAZ when sensitization is present as it modifies the original microstructure of the material. New IIRT experiments have been conducted on both welded and unwelded 440C alloy samples to establish quantitative data on the heating profiles. These results (in conjunction with the appropriate experimental parameters) were then used to create a numerical model to replicate them. Despite some limitations in populating the model with accurate parameters, the results obtained were in good agreement with the experiments and provide a foundation for future work. Future work will focus on establishing a predictive tool that can detect and quantify the level of sensitization in an arbitrary steel sample in the field.
10
Mokhtari, Mohammed-Yacine. "Potentiel de la robotique pour l'inspection thermographique par chauffage inductif." Master's thesis, Université Laval, 2018. http://hdl.handle.net/20.500.11794/33042.
Анотація:
La thermographie par courants de Foucault (ECT) est une méthode de thermographie active. L’excitation inductive génère des courants de Foucault dans les spécimens conducteurs. En présence de défauts, la circulation des courants est affectée par ces discontinuités produisant un changement dans la distribution de la température autour des défauts. Ces changements sont observés avec une caméra infrarouge. Dans ce travail, on présente une application robotique de la thermographie par courants de Foucault. Une interface robotique a été développée et tous les capteurs utilisés ont été intégrés à la plateforme. Des simulations ont été achevées avec COMSOL Multiphysics en variant différents paramètres. Des expériences ont été menées sur plusieurs spécimens (de différents matériaux) avec des défauts de différents types et tailles. La linescan thermographie est principalement étudiée et d’autres modes d’inspections ont été explorés. Les images résultantes sont reconstruites avec un algorithme dédié. Finalement, les résultats de la méthode sont comparés à ceux de la thermographie optique (par halogène) pour montrer les capacités de la méthode.Eddy current thermography (ECT) is an active thermography method. The inductive excitation generates Eddy currents in electrically-conductive specimen. In a presence of defects, the eddy current flow is affected by these discontinuities leading to changes in the temperature distribution in the specimen around the defects. These changes are observed by an infrared camera. In this work, we present a robotic application of the method. A robotic interface is developed and all the sensors needed are integrated to the platform. Simulations are performed using COMSOL Multiphysics by varying different parameters. Experiments are realised on different specimens (made of different materials) with defects of different sizes. The linescan Eddy current thermography is studied and other modes are explored. The resulting images are reconstructed with a dedicated algorithm. Finally, the method’s results are compared to optical thermography to show the capability of the method.
Частини книг з теми "Thermographie inductive":
1
Netzelmann, Udo. "Induction Thermography of Surface Defects." In Handbook of Advanced Non-Destructive Evaluation, 1–26. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-30050-4_31-1.
2
Netzelmann, Udo. "Induction Thermography of Surface Defects." In Handbook of Advanced Nondestructive Evaluation, 1497–522. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-26553-7_31.
3
De Vanna, Davide, Ester D’Accardi, Giuseppe Dell’Avvocato, Davide Palumbo, and Umberto Galietti. "Induction Thermography: Influence of Testing Parameters for Different Crack Geometry." In Challenges in Mechanics of Biological Systems and Materials, Thermomechanics and Infrared Imaging, Time Dependent Materials and Residual Stress, Volume 2, 73–82. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-50470-9_11.
4
Du, T., F. Brachelet, D. Defer, and E. Antczak. "Quantitative Evaluation of Thermal Diffusivity and Thickness of Mortar Cover Using Induction Thermography." In Nondestructive Testing of Materials and Structures, 285–91. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0723-8_41.
5
Ba, Abdoulaye, Qiuji Yi, Junzhen Zhu, Huu-Kien Bui, Gui Yun Tian, Gérard Berthiau, and Guillaume Wasselynck. "Impact Damages Detection on CFRP Using Eddy Current Pulsed Thermography." In Studies in Applied Electromagnetics and Mechanics. IOS Press, 2020. http://dx.doi.org/10.3233/saem200025.
Анотація:
Carbon Fiber Reinforced Polymer (CFRP) materials are widely used in aerospace due to their low weigh to strength ratio. Non-destructive Testing (NDT) Techniques becomes a necessity with increasing use of CFRP materials. Induction Thermography is a new NDT technique that can be exploited as a promising fast and global control. However, the detection of typical flaws in carbon composites such as delamination, fibers rupture and impact damages need to be further investigated in order to optimize the technique. Optimization can be done in the test configuration level and by the use an appropriate image technique. In this paper Eddy Current Pulse Compression Thermography (ECPuCT) is used to detect impact damages on CFRP materials. The Principal Component Analysis (PCA) based image processing technique is used to detect and visualize impact damage area from transient thermal images. Flaw detection results using experimental measures will be shown and discussed.
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"Investigation of Helmholtz coils for edge structure using inductive thermography." In Structural Health Monitoring and Integrity Management, 199. CRC Press, 2015. http://dx.doi.org/10.1201/b18510-64.
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Deng, Shuwen, Suixian Yang, and Yong Yao. "Numerical Simulation on Stress Measurement with Eddy Current Thermography." In Studies in Applied Electromagnetics and Mechanics. IOS Press, 2020. http://dx.doi.org/10.3233/saem200018.
Анотація:
Stress in components will lead to the change of material properties and even failure. Therefore, the assessment for the stress state of components is play an important role in testing industry. As a non-contact and multi-physical field nondestructive testing method, eddy current thermography (ECT) can be applied to detect non-homogeneous electromagnetic characteristics parameter distribution in conductive materials. Internal stress and its distribution in a material will affect the value of electromagnetic characteristic parameters. If induction current applied on conductive material, the Joule’s heat, which generate in the sample will lead to the temperature rise on the surface of the specimen by induction heating process. The temperature distribution on the specimen surface can be recorded by infra camera and stored as IR images or videos. The feature of the temperature distribution and its variation can be used to express the stress state in the specimen. It is concluded that there is an approximate linear relationship between the surface temperature appreciation and the loading force when the excitation source condition remains unchanged.
Тези доповідей конференцій з теми "Thermographie inductive":
1
Tout, karim, and patrick Bouteille. "Defect detection on inductive thermography images using convolutional neural networks." In 16th Quantitative InfraRed Thermography conference. QIRT Council, 2022. http://dx.doi.org/10.21611/qirt.2022.3037.
Анотація:
Inductive infrared thermography has been proven as an interesting solution for the inspection of surface defects. However, inductive thermography images can be noisy or present large variations in contrast and texture. Combine that with the large variability in surface defects shapes, sizes and types, the defect detection task becomes very complex. Defect detection methods based on convolutional neural network (CNN) proved their efficiency for complex detection tasks. This paper discusses two main approaches of defect detection with CNN : classification and object detection. Detection results are presented along with the advantages and weaknesses of each approach for real-time defect detection
2
Zhao, Jian, Bin Gao, Fasheng Qiu, Qizhi Feng, Peng LU, and Gui Yun Tian. "Electrostatic Induction Thermography." In 2017 Far East NDT New Technology & Application Forum (FENDT). IEEE, 2017. http://dx.doi.org/10.1109/fendt.2017.8584611.
3
Oswald-Tranta, B., and C. Tuschl. "Detection of short fatigue cracks by inductive thermography." In 2020 Quantitative InfraRed Thermography. QIRT Council, 2020. http://dx.doi.org/10.21611/qirt.2020.033.
4
Oswald-Tranta, B., and R. Schmidt. "Crack depth determination with inductive thermography." In SPIE Sensing Technology + Applications, edited by Sheng-Jen (Tony) Hsieh and Joseph N. Zalameda. SPIE, 2015. http://dx.doi.org/10.1117/12.2176333.
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Noethen, Matthias, and Norbert Meyendorf. "Defect characterization by inductive heated thermography." In REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION: Volume 31. AIP, 2012. http://dx.doi.org/10.1063/1.4716266.
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Safai, Morteza, Gary Georgeson, and Kimberly Meredith. "Thermographic non-destructive testing using inductive thermal excitation." In The 15th International Symposium on: Smart Structures and Materials & Nondestructive Evaluation and Health Monitoring, edited by Peter J. Shull, H. Felix Wu, Aaron A. Diaz, and Dietmar W. Vogel. SPIE, 2008. http://dx.doi.org/10.1117/12.777097.
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Oswald-Tranta, B., G. Wally, and J. Oswald. "A semi-analytical model for the temperature distribution of thermo-inductive heating." In 2006 Quantitative InfraRed Thermography. QIRT Council, 2006. http://dx.doi.org/10.21611/qirt.2006.034.
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Oswald-Tranta, B., and C. Tuschl. "Lock-in inductive thermography for surface crack detection in non-magnetic metals." In 2018 Quantitative InfraRed Thermography. QIRT Council, 2018. http://dx.doi.org/10.21611/qirt.2018.c.
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Oswald-Tranta, Beata, Christoph Tuschl, and Ralf Schledjewski. "Flash and inductive thermography for CFRP inspection." In Thermosense: Thermal Infrared Applications XLI, edited by Jaap de Vries and Beate Oswald-Tranta. SPIE, 2019. http://dx.doi.org/10.1117/12.2520104.
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Oswald-Tranta, Beate, Christoph Tuschl, and Alexander Hackl. "Detection of subsurface cracks using inductive thermography." In Thermosense: Thermal Infrared Applications XLIII, edited by Joseph N. Zalameda and Arantza Mendioroz. SPIE, 2021. http://dx.doi.org/10.1117/12.2585623.