Relevant bibliographies by topics / Thermography

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Thermography'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 August 2024

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Journal articles on the topic "Thermography"

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Oe, Makoto, Rie Roselyne Yotsu, Hiromi Sanada, Takashi Nagase, and Takeshi Tamaki. "Screening for Osteomyelitis Using Thermography in Patients with Diabetic Foot." Ulcers 2013 (March 31, 2013): 1–6. http://dx.doi.org/10.1155/2013/284294.

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One of the most serious complications of diabetic foot (DF) is osteomyelitis, and early detection is important. To assess the validity of thermography to screen for osteomyelitis, we investigated thermographic findings in patients with both DF and osteomyelitis. The subjects were 18 diabetic patients with 20 occurrences of DF who visited a dermatology department at a hospital in Tokyo and underwent evaluation by magnetic resonance imaging (MRI) and thermography between June 2010 and July 2012. Osteomyelitis was identified by MRI. Thermographs were taken of the wounds and legs after bed rest of more than 15 minutes. Two wound management researchers evaluated the range of increased skin temperature. There were three types of distribution of increased skin temperature: the periwound, ankle, and knee patterns. Fisher’s exact test revealed that the ankle pattern was significantly more common in the group with osteomyelitis than in the group without osteomyelitis (P=0.011). The positive predictive value was 100%, and the negative predictive value was 71.4%. Our results suggest that an area of increased skin temperature extending to the ankle can be a sign of osteomyelitis. Thermography might therefore be useful for screening for osteomyelitis in patients with DF.
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Zhou, Jian Min, Jun Yang, and Qi Wan. "Review on Non-Destructive Testing Technique of Eddy Current Pulsed Thermography." Applied Mechanics and Materials 742 (March 2015): 128–31. http://dx.doi.org/10.4028/www.scientific.net/amm.742.128.

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This paper introduces the theory of eddy current pulsed thermography and expounds the research status of eddy current pulsed thermography in application and information extraction. Thermographic signal reconstruction, pulsed phase thermography, principal component analysis were introuduced in this paper and listed some fusion multiple methods to acquire information from infrared image. At last, it summarizes research progress, existing problem and deelopment of eddy current pulsed thermography.
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Nurhandayani, Lenny, Sri Andarini, and Heri Kristianto. "DIABETIC FOOT: A SCOPING REVIEW OF NEUROSENSORIC DISORDERS – THERMOGRAPHY." Jurnal Health Sains 4, no. 7 (July 26, 2023): 19–25. http://dx.doi.org/10.46799/jhs.v4i7.1006.

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Background: Diabetic foot is a chronic complication that can be detrimental and has an impact on the quality of life of diabetic patients. Neurosensory examination of skin temperature using a thermograph can help prevent diabetic foot. Objective: to identify the neurosensory examination of skin temperature using infrared thermographs in addressing the risk of diabetic foot Design: The design in this study is Scoping review Methods: A journal search was conducted using the keywords "infrared thermography, screening or assessment, diabetic foot, and meta-analysis" to collect relevant articles published in the last ten years from four databases (ProQuest, PubMed, ScienceDirect, and Google Scholar). The inclusion criteria were: nurses, patients, diabetic foot, assessment, full-text articles, studies focusing on nursing issues, and written in English. Four journal articles were selected and analyzed using PICO. Results: Four meta-analysis articles on neurosensory examination of skin temperature sensitivity using a thermograph have a p value < 0.05, which can support clinical nursing for monitoring diabetic foot prevention. Conclusion: Examination of skin temperature sensation using a thermograph can be used as a method for neurosensory assessment in monitoring nursing care for structural integrity problems in the physiological changes of the diabetic foot.
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Popardovská, Eva, and Vladimír Popardovský. "Active Thermografy as a Method for Non-destructive Testing of Polymer Composite Materials." Science & Military 16, no. 2 (2021): 5–9. http://dx.doi.org/10.52651/sam.a.2021.2.5-9.

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Infrared (IR) thermography is a method for imaging thermal fields on the target surfaces in real time. It is a noncontact and non-destructive method of obtaining thermogram of tested material surface or inside of it. We can divide the IR thermographic testing methods into two basic groups – passive and active thermography. This article introduces a basic overview of IR active thermography.
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Yang, B., P. K. Liaw, J. Y. Huang, R. C. Kuo, J. G. Huang, and D. E. Fielden. "Stress Analyses and Geometry Effects During Cyclic Loading Using Thermography." Journal of Engineering Materials and Technology 127, no. 1 (January 1, 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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Livada, Časlav, Hrvoje Glavaš, Alfonzo Baumgartner, and Dina Jukić. "The Dangers of Analyzing Thermographic Radiometric Data as Images." Journal of Imaging 9, no. 7 (July 12, 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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Wang, X. G., V. Crupi, X. L. Guo, and E. Guglielmino. "A thermography-based approach for structural analysis and fatigue evaluation." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 226, no. 5 (September 23, 2011): 1173–85. http://dx.doi.org/10.1177/0954406211421998.

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The infrared thermography has been developed for Non-Destructive Testing (NDT), stress analysis, and in the last 10 years for metal fatigue assessment. The present research enables to realize these different research objectives all together thanks to an innovative experimental procedure, which includes NDT by lock-in thermography, thermoelastic stress analysis, and fatigue parameters assessment by Rapid Thermographic Method ( RTM). The developed procedure has been performed on a set of hole-notched specimens, achieving good results and predictions in a relatively short time. Moreover, the fatigue strength reduction coefficients of the specimens were determined by RTM. This thermography-based approach is dedicated for structural analysis and fatigue evaluation; it is an interesting attempt to apply different thermographic methods to a common research topic.
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Kaur, K., A. Sharma, A. Rani, V. Kher, and R. Mulaveesala. "Physical insights into principal component thermography." Insight - Non-Destructive Testing and Condition Monitoring 62, no. 5 (May 1, 2020): 277–80. http://dx.doi.org/10.1784/insi.2020.62.5.277.

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Among widely used non-destructive testing (NDT) methods, infrared thermography (IRT) has gained importance due to its fast, whole-field, remote and quantitative inspection capabilities for the evaluation of various materials. Being fast and easy to implement, pulsed thermography (PT) plays a vital role in the infrared thermographic community. This paper provides a physical insight into the selection of empirical orthogonal functions obtained from principal component pulsed thermography for the detection of subsurface defects located inside a mild steel specimen.
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Cabizosu, Alessio, Daniele Grotto, Alberto López López, and Raúl Castañeda Vozmediano. "Thermography Sensor to Assess Motor and Sensitive Neuromuscular Sequels of Brain Damage." Sensors 24, no. 6 (March 7, 2024): 1723. http://dx.doi.org/10.3390/s24061723.

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Introduction. The aim of this study was to observe the validity, diagnostic capacity, and reliability of the thermographic technique in the analysis of sensitive and motor sequelae in patients with chronic brain damage. Method. A longitudinal descriptive observational study was performed. Forty-five people with impairment in at least one anatomical region participated in and completed this study. All patients who had become infected by SARS-CoV-2 in the past year were excluded. Thermographic measurement was conducted, and the Modified Ashworth Scale and Pressure Pain Threshold was analyzed. Results. A high correlation between two times of thermography data was observed. The Spearman correlations obtained between the Ashworth score on each leg and the temperature given by thermography were all significant. Discussion and conclusions. Despite the above, the Spearman correlations obtained between the PPT in each leg and the temperature offered by thermography were not significant in any of the measurements. For this reason, thermography is a potential tool for the diagnosis and assessment of neuromuscular motor sequelae, but not for sensitive sequelae, after brain injury. Nevertheless, for the time being, no statistical relationship has been observed between the data reported by thermography and PPT; thus, future studies are needed to further investigate these results.
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Mineo, Carmelo, Nicola Montinaro, Mario Fustaino, Antonio Pantano, and Donatella Cerniglia. "Fine Alignment of Thermographic Images for Robotic Inspection of Parts with Complex Geometries." Sensors 22, no. 16 (August 20, 2022): 6267. http://dx.doi.org/10.3390/s22166267.

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Increasing the efficiency of the quality control phase in industrial production lines through automation is a rapidly growing trend. In non-destructive testing, active thermography techniques are known for their suitability to allow rapid non-contact and full-field inspections. The robotic manipulation of the thermographic instrumentation enables the possibility of performing inspections of large components with complex geometries by collecting multiple thermographic images from optimal positions. The robotisation of the thermographic inspection is highly desirable to improve assessment speed and repeatability without compromising inspection accuracy. Although integrating a robotic setup for thermographic data capture is not challenging, the application of robotic thermography has not grown significantly to date due to the absence of a suitable approach for merging multiple thermographic images into a single presentation. Indeed, such an approach must guarantee accurate alignment and consistent pixel blending, which is crucial to facilitate defect detection and sizing. In this work, an innovative inspection platform was conceptualised and implemented, consisting of a pulsed thermography setup, a six-axis robotic manipulator and an algorithm for image alignment, correction and blending. The performance of the inspection platform is tested on a convex-shaped specimen with artificial defects, which highlights the potential of the new combined approach. This work bridges a technology gap, making thermographic inspections more deployable in industrial environments. The proposed fine image alignment approach can find applicability beyond thermographic non-destructive testing.
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Dissertations / Theses on the topic "Thermography"

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Purslow, Christine. "Dynamic ocular thermography." Thesis, Aston University, 2005. http://publications.aston.ac.uk/14563/.

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The ability to measure ocular surface temperature (OST) with thermal imaging offers potential insight into ocular physiology that has been acknowledged in the literature. The TH7102MX thermo-camera (NEC San-ei, Japan) continuously records dynamic information about OST without sacrificing spatial resolution. Using purpose-designed image analysis software, it was possible to select and quantify the principal components of absolute temperature values and the magnitude plus rate of temperature change that followed blinking. The techniques was examined for repeatability, reproducibility and the effects of extrinsic factors: a suitable experimental protocol was thus developed. The precise source of the measured thermal radiation has previously been subject toe dispute: in this thesis, the results of a study examining the relationships between physical parameters of the anterior eye and OST, confirmed a principal role for the tear film in OST. The dynamic changes in OST were studied in a large group of young subjects: quantifying the post-blink changes in temperature with time also established a role for tear flow dynamics in OST. Using dynamic thermography, the effects of hydrogel contact lens wear on OST were investigated: a model eye for in vivo work, and both neophyte and adapted contact lens wearers for in vivo studies. Significantly greater OST was observed in contact lens wearers, particularly with silicone hydrogel lenses compared to etafilcon A, and tended to be greatest when lenses had been worn continuously. This finding is important to understanding the ocular response to contact lens wear. In a group of normal subjects, dynamic thermography appeared to measure the ocular response to the application of artificial tear drops: this may prove to be a significant research and clinical tool.
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Larsen, Cory A. "Document Flash Thermography." DigitalCommons@USU, 2011. https://digitalcommons.usu.edu/etd/1018.

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This thesis presents the application of ash thermography techniques to the analysis of documents. The motivation for this research is to develop the ability to non-destructively reveal covered writings in archaeological artifacts such as the Codex Selden or Egyptian car- tonnage. Current common signal processing techniques are evaluated for their effectiveness in enhancing subsurface writings found within a set of test documents. These processing techniques include: false colorization, contrast stretching, histogram equalization, median altering, Gaussian low-pass altering, layered signal reconstruction and thermal signal reconstruction (TSR), several contrast image definitions, differential absolute contrast (DAC), correlated contrast, derivative images, principal component thermography (PCT), dynamic thermal tomography (DTT), pulse phase thermography (PPT), tying-correlation analysis (FCA), Hough transform thermography (PTHTa), and transmission line matrix tying algorithm (TLMFa). New processing techniques are developed and evaluated against the existing techniques. The ability of ash thermography coupled with processing techniques to reveal subsurface writings and document strikeouts is evaluated. Flash thermography parameters are evaluated to determine most eeffective value for the document. In summary, this thesis reports the following contributions to the existing scientific knowledge: 1. A comprehensive analysis of existing pulsed thermography processing techniques. 2. New pulsed thermography processing techniques that improve upon the results of the existing techniques were developed. 3. A proof-of-concept for detecting subsurface ink writings in documents. 4. Varies the capability of pulsed thermography techniques to detect document strike- outs. 5. Demonstrates the ability to enhance surface writings based on differences in thermal characteristics when optical characteristics do not vary significantly. 6. Demonstrates that pulsed thermography significantly improves upon multi-spectral imaging for subsurface and surface writing enhancement. 7. Provides an evaluation of ash thermography parameters for the most effective document imaging.
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Ziegler, Mathias. "Thermography of semiconductor lasers." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2009. http://dx.doi.org/10.18452/15944.

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Halbleiterlaser stellen mit über 70% Wirkungsgrad einzigartig effiziente Lichtquellen dar. Dennoch ist ihre zuverlässige Nutzung, insbesondere im Bereich hoher Leistungsdichten, von thermischen Limitierungen geprägt. Einen grundlegenden Beitrag zu deren physikalischen Verständnis leistet die Analyse der thermischen Eigenschaften und Degradationsprozesse solcher Bauelemente. In dieser Arbeit wird hierzu die Thermographie als innovative Analysemethode untersucht. Das Plancksche Strahlungsgesetz erlaubt die radiometrische Ermittlung der Temperatur. Die wichtige physikalische Kenngröße Emissivität wird in dieser Arbeit für Halbleiter und Halbleiterlaserstrukturen spektral gemessen und auf fundamentale physikalische Eigenschaften zurückgeführt. Auf dieser Grundlage werden methodische Aspekte der Thermographie diskutiert, welche durch den thermischen Hintergrund und die teilweise Transparenz der Halbleitermaterialien geprägt sind. Die daraus folgenden analytischen Fähigkeiten erlauben unter anderem die orts- und zeitaufgelöste Bestimmung der thermischen Eigenschaften von komplexen Hochleistungslasern unterschiedlichster Bauart. Darüber hinaus ermöglicht die Kenntnis der beteiligten thermischen Zeitkonstanten die Extraktion von lokalen Überhöhungen in der Infrarotemission, deren Zusammenhang zur Degradation der Bauelemente untersucht wird. Eine grundsätzliche Begrenzung der Ausgangsleistung ist durch einen abrupten Degradationsprozess gegeben, welcher maßgeblich durch eine Reabsorption der Laserstrahlung an der Frontfacette verursacht wird. Mithilfe einer kombinierten Thermographie-Nahfeld-Messung wird dieser Prozess orts- und zeitaufgelöst analysiert. Die Erweiterung des Messfensters zu kürzeren Wellenlängen hin erlaubt die Detektion strahlender Übergänge unter Einbeziehung von Defektzentren welche als strahlende Signaturen von graduellen Degradationsprozessen aufzufassen sind.
Semiconductor lasers are unequaled efficient light sources, reaching efficiencies of more than 70%. Nevertheless, thermal limits govern their reliable application, in particular in the field of high power densities. The analysis of thermal properties and degradation processes in such devices contributes essentially to the understanding of these limits. This work exploits thermography as an innovative analytical technique for such purpose. Planck''s law allows for a radiometric detection of temperatures. In this work, the important physical parameter emissivity is measured spectrally resolved for both semiconductors and semiconductor laser structures and is related to fundamental physical properties. Based on that, methodological aspects are discussed, which are affected on the one hand by the omnipresent thermal radiation and on the other hand by the partial transparency of the semiconductor materials. The resulting analytical capacities allow, for instance, for the determination of the thermal properties of complex high-power lasers of a wide range of different designs in a spatio-temporally resolved fashion. Furthermore, does the knowledge of the involved thermal time constants allow for an extraction of localized peaks of the infrared emission that is analyzed for its relationship with device degradation. The output power of high-power devices is fundamentally limited by the catastrophic optical damage, an abrupt degradation process that is induced significantly by reabsorption of laser radiation at the front facet. This process is analyzed spatio-temporally resolved with help of a combined thermography and optical near-field technique. Extending the detection range down to shorter wavelengths allows for imaging of radiative transitions that are related to defect centers, which are interpreted as radiative signatures of gradual device degradation processes.
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Monchau, Jean-Pierre. "Mesure d'émissivité pour la thermographie infrarouge appliquée au diagnostic quantitatif des structures." Thesis, Paris Est, 2013. http://www.theses.fr/2013PEST1128/document.

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La thermographie infrarouge constitue un outil de diagnostic très utile dans le domaine du bâtiment et du génie civil. Cependant un diagnostic quantitatif reste difficile, et l'émissivité des surfaces étudiées joue un rôle important. Le présent travail est une étude sur la mesure d'émissivité pour le diagnostic quantitatif des structures par thermographie. Un des enjeux est de compléter une base de données d'émissivité pour des matériaux du bâtiment et du génie civil ; pour cela il a été nécessaire de développer des appareils de mesure portables. Deux appareils ont été développés au CERTES, utilisant des méthodes indirectes. Ces méthodes consistent à mesurer la réflexion d'un flux infrarouge modulé et nécessite une référence de réflectance connue. Le premier appareil module le flux par modulation lente de température (mesure en 16mn) ; il est adapté aux surfaces diffusantes et hétérogènes comme les bétons bitumineux et les matériaux de construction du bâtiment. L'autre appareil utilise un système d'écran permettant une modulation plus rapide (mesure en quelques secondes). Il est plus polyvalent. Il est aussi plus facilement transportable et permet également d'obtenir une évaluation du caractère plus ou moins spéculaire de la surface. Ces deux appareils couvrent au choix une bande spectrale large (1 à 40µm) pour évaluer les propriétés radiatives des surfaces et une bande étroite (8 à 14µm) adaptée à la sensibilité des caméras infrarouges. Une étude comparative sur les mesures d'émissivité a été entreprise avec le LNE (Laboratoire National de Métrologie et d'Essais). Les échantillons utilisés pour cette étude comparative ont permis de tester les différents dispositifs pour des matériaux ayant des propriétés radiatives très variées. Des mesures ont été effectuées au laboratoire et sur site sur une large gamme de matériaux usuels du bâtiment et du génie civil
Thermography is a very useful diagnosis tool in buildings and civil engineering structures. However quantitative diagnosis remains difficult, and having accurate values of surface emissivity is an important factor. The present work is a study about emissivity measurement for quantitative diagnosis with thermography. We needed accurate measurement of the emissivity of a number of civil engineering materials, in order to create a database. Thus, it was necessary to develop new portable measurement devices. Two devices using an indirect measurement method were developed at CERTES laboratory. The method uses the measurement of the reflectivity from a modulated IR source and requires calibration with a highly reflective surface. The first device uses a low-frequency, thermal modulation well-adapted to laboratory measurements, whereas the second one is a portable system using a mechanical modulation at a faster frequency, more appropriate to outdoor measurements. Both devices allow measurements in the broad (1—50µm) and narrow (8—14µm) bands. Experiments were performed on a large number of materials commonly used in buildings and civil engineering structures. The final objective of this work is to build a database of emissivity for these materials. A comparison of laboratory and on-site measurements of emissivity values obtained in both spectral bands is presented along with an estimation and an analysis of measurement uncertainties. A comparative study with measurement obtained at LNE (Laboratoire National de Métrologie et d'Essais, French laboratory of metrology) was performed, using a range of materials with widely different radiative properties. An analysis of discrepancies and their possible causes is presented
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Moussa, Wael. "Thermography-Assisted Bearing Condition Monitoring." Thesis, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/31379.

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Abstract Despite the large amount of research work in condition based maintenance and condition monitoring methods, there is still a need for more reliable and accurate methods. The clear evidence of that need is the continued dependence on time based maintenance, especially for critical applications such as turbomachinery and airplane engines. The lack of accurate condition monitoring systems could lead to not only the unexpected failures as well as the resulting hazards and repair costs, but also a huge waste of material and time because of unnecessary replacement due to false alarms and unnecessary repair and maintenance. Temperature change is a phenomenon that accompanies every dynamic activity in the universe. However, it has not been adequately exploited for mechanical system condition monitoring. The reason is the slow response of current temperature monitoring systems compared to other condition monitoring methods such as vibration analysis. Many references inferred that the change in temperature is not sensible until approaching the end of the monitored component life and even the whole system life (Kurfess, et al., 2006; Randall, 2011; Patrick, et al., March 7-14, 2009). On the other hand, the most commonly used condition monitoring method, i.e., vibration analysis, is not free from pitfalls. Although vibration analysis has shown success in detecting some bearing faults, for other faults like lubrication problems and gradual wear it is much less effective. Also, it does not give a reliable indication of fault severity for many types of bearing faults. The advancement of thermography as a temperature monitoring tool encourages the reconsideration of temperature monitoring for mechanical system fault detection. In addition to the improved accuracy and responsiveness, it has the advantage of non-contact monitoring which eliminates the need for complex sensor mounting and wiring especially for rotating components. Therefore, in current studies the thermography-based monitoring method is often used either as a distinct method or as a complementary tool to vibration analysis in an integrated condition monitoring system. The main objectives of this study are hence to: 1. Define heat sources in the rolling element bearings and overview two of the most famous bearing temperature calculation methods. 2. Setup a bearing test rig that is equipped with both vibration and temperature monitoring systems. 3. Develop a temperature calculation analytical model for rolling element bearing that include both friction calculation and heat transfer models. The friction calculated by the model will be compared to that calculated using the pre-defined empirical methods. The heat transfer model is used for bearing temperature calculation that will be compared to the experimental measurement using different temperature monitoring devices. 4. Propose a new in-band signal enhancement technique, based on the synchronous averaging technique, Autonomous Time Synchronous Averaging (ATSA) that does not need an angular position measuring device. The proposed method, in addition to the Spectral Kurtosis based band selection, will be used to enhance the bearing envelope analysis. 5. Propose a new method for classification of the bearing faults based on the fault severity and the strength of impulsiveness in vibration signals. It will be used for planning different types of tests using both temperature and vibration methods. 6. Develop and experimentally test a new technique to stimulate the bearing temperature transient condition. The technique is supported by the results of finite element modeling and is used for bearing temperature condition monitoring when the bearing is already running at thermal equilibrium condition.
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Li, Zheng Ph D. Massachusetts Institute of Technology. "Computational Raman imaging and thermography." Thesis, Massachusetts Institute of Technology, 2021. https://hdl.handle.net/1721.1/130673.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Materials Science and Engineering, February, 2021
Cataloged from the official PDF of thesis.
Includes bibliographical references (pages 185-201).
Thermography tools that perform accurate temperature measurements with nanoscale resolution are highly desired in our modern society. Although researchers have put extensive efforts in developing nanoscale thermography for more than three decades and a significant amount of achievements have been made in this field, the mainstream thermography tools have not fully met the requirements from the industry and the academia. In this thesis, we present our home-built Raman microscope for Raman imaging and thermography. The performance of this instrument is enhanced by computational approaches. The body of the thesis will be divided into three parts. First, the instrumentation of our setup are introduced. Second, we present the results of Raman imaging with computational super-resolution techniques. Third, this instrument is used as a thermography tool to map the temperature profile of a nanowire device. These results provide insights in combining advanced instrumentation and computational methods in Raman imaging and Raman thermography for the applications in modern nano-technology.
by Zheng Li.
Ph. D.
Ph.D. Massachusetts Institute of Technology, Department of Materials Science and Engineering
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Morgan, P. B. "Ocular thermography in health and disease." Thesis, University of Manchester, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.507520.

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There has been interest in ocular temperature for over a century, with the publication of a limited amount of literature over that time. This thesis reports on the development and utilisation of a system for the measurement of ocular surface temperature based on an advanced infrared detector. The development of a suitable protocol for the infrared imaging and temperature measurement of the eye was established. Results from the analysis of the ocular temperature of 98 normal subjects indicated that the temperature at the centre of the cornea was 31.68 ± 0.60°C (mean ± SD), and the mean ocular surface temperature (MOST) was 32.10 ± 0.53°C. This value rose with increasing room and oral temperature (both p< 0.0001) and decreased with corneal thickness (p< 0.05) and age (p< 0.01). Ninety five per cent of the subjects had an inter-ocular difference in MOST within 0.53°C. There was a positive relationship between the variation in temperature across the ocular surface and the distance between the corneal apex and a coronal plane through the limbus (p< 0.001). The effect on eye temperature of changes in the ocular blood, nerve and tear supplies was studied. Three of nine patients (33%) with unilateral inflammatory disease had ocular temperature outside the established normal limits. For the group of patients as a whole, the temperature of the affected eye was warmer than the fellow (32.40 ± 0.81°C compared with 32.10 ± 0.70°C; p< 0.05). In a further study, there was a significant negative relationship between the degree of stenosis of the carotid artery and eye temperature (p< 0.001). In the examination of two patients with Horner's syndrome, one demonstrated a difference in eye temperature (0.61°C) outside normal limits (0.53°C), with the affected eye being warmer.
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Fox, Matthew William. "Thermography approaches for building defect detection." Thesis, University of Plymouth, 2016. http://hdl.handle.net/10026.1/4304.

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Thermography is one technology, which can be used to detect thermally significant defects in buildings and is traditionally performed using a walk-through methodology. Yet because of limitations such as transient climatic changes, there is a key performance gap between image capture and interpretation. There are however new methodologies currently available, which actively address some of these limitations. By better understanding alternative methodologies, the performance gap can be reduced. This thesis contrasts three thermography methodologies (Walk-through, time-lapse and pass-by) to learn how they deal with limitations and address specific building defects and thermal performance issues. For each approach, practical methodologies were developed and used on laboratory experiments (hot plate) and real dwelling case studies. For the real building studies, 133 dwellings located in Devon and Cornwall (South West England) were studied; this sample represents a broad spectrum of construction types and building ages. Experiments testing these three methodologies found individual strengths and weaknesses for each approach. Whilst traditional thermography can detect multiple defects, characterisation is not always easy to achieve due to the effects of transient changes, which are largely ignored under this methodology. Time-lapse thermography allows the observation of transient changes from which more accurate assessment of defect behaviour can be gained. This is due to improved differentiation between environmental conditions (such as cloud cover and clear sky reflections), actual material thermal behaviour and construction defects. However time-lapse thermography is slow, complex and normally only observes one view. Walk-past thermography is a much faster methodology, inspecting up to 50 dwellings per survey session. Yet this methodology misses many potential defects due to low spatial resolutions, single (external only) elevation inspection and ignoring transient climate and material changes. The implications of these results for building surveying practice clearly indicate that for an improved defect characterisation of difficult to interpret defects such as moisture ingress, thermographers should make use of time-lapse thermography. A review of methodology practicalities illustrates how the need for improved characterisation can be balanced against time and resources when deciding upon the most suitable approach. In order to help building managers and thermographers to decide on the most suitable thermography approach, two strategies have been developed. The first combines different thermography methodologies into a phased inspection program, where spatial and temporal resolution increase with each subsequent thermography inspection. The second provides a decision-making framework to help select the most appropriate thermography methodology for a given scenario or defect.
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Zhang, Cheng. "Influence of surface roughness on thermography measurement." Thesis, Högskolan Väst, Avd för automationssystem, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-6842.

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This university Bachelor's Thesis was performed to explore the influence of surface roughness on the thermography measurement. Thermography is a non-destructive testing method which can be used to detect cracks. However, it is hard to define how the surface roughness influences the emissivity and the result of a thermography measurement, as well as how the angle of the excitation source influences the result. Therefore, this work aims to define how the heating angle and surface roughness influence the thermography measurement, define the relationship between surface roughness and emissivity for the same crack, and define the influence of the angles which composed of the heating source, the direction of crack and the direction of surface roughness on thermography measurement. In this report, the theories of radiation and Signal-to-noise ratio (SNR) were explained, clearly. Also, two kinds of experiments were set up. One is focus on how the heating angle influence the thermography measurement, the other is focus on how the angle of the heating source, in relation to the crack direction and the direction of surface roughness, influence the SNR value. The conclusions of these experiments are that the heating of a crack increases as the angle decreases (from wide side to narrow side) and the angle ofincreases (from horizontal to vertical). Moreover, the SNR value decreases as the surface roughness increases. For the same surface roughness, the SNR value increases with increased crack angle (0°, 45° or 90°) and with decreased sample position angle (horizontal, 45°or vertical). What is more, the higher surface roughness, the larger the influence of the crack angle and the sample position angle. Finally, when the surface is polish, the crack angle and the sample position angle does not have any influence.
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Schuricht, Paul Hans. "Liquid crystal thermography in high speed flows." Thesis, University of Southampton, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310549.

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Books on the topic "Thermography"

1

James, Christiansen. Thermography. Baltimore: Williams & Wilkins, 1990.

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Gaussorgues, Gilbert. Infrared thermography. London: Chapman & Hall, 1994.

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Gaussorgues, G. Infrared Thermography. Dordrecht: Springer Netherlands, 1994.

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Gaussorgues, G. Infrared Thermography. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0711-2.

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Dankiw, Wolodja. Medical thermography. Canberra: Australian Govt. Pub. Service, 1990.

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Dolgov, I., Mihail Volovik, and Sergey Kolesov. DORSOPATHIES Thermography Atlas. ru: INFRA-M Academic Publishing LLC., 2021. http://dx.doi.org/10.12737/textbook_61b1abe32ca453.81844928.

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This issue is devoted to the medical thermography theory and practice in patients with dorsopathies. Thermography signs of clinical manifestation, such as scoliosis, muscular-tonic syndrome, intervertebral disc and disco-radicular conflicts, lumbo-sacral joints involvment and referred pain are described, based on specific exercise tests and temperature gradients. This book may be useful for all physicians who treat patients with “back pain
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Breitenstein, Otwin, Wilhelm Warta, and Martin C. Schubert. Lock-in Thermography. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99825-1.

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Breitenstein, Otwin, and Martin Langenkamp. Lock-in Thermography. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-08396-3.

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Breitenstein, Otwin, Wilhelm Warta, and Martin Langenkamp. Lock-in Thermography. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-02417-7.

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Volovik, Mihail, I. Dolgov, and Natal'ya Muravina. THERMOGRAPHY SCREENING DISORDERS AND INJURIES OF PERIPHERAL NERVES Thermography Atlas. ru: INFRA-M Academic Publishing LLC., 2021. http://dx.doi.org/10.12737/textbook_61b1a3def1e114.93523951.

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Medical thermography is a non-invasive non-contact diagnostic method that allows to measure thermal radiation and visualize its distribution on the human body surface. The proposed atlas of thermograms is dedicated to the thermography diagnostic of disorders and injuries of peripheral nerves. Diagnostic criteria itself are based on the changes of normal temperature distribution in the area which is innervated by the disfunction nerve. All cases of pathology confirmed by reference methods and clinical data. The edition can be useful for neurologists, neurosurgeons, rehabilitation specialists, physiotherapists who treat the patients with the peripheral nerve pathology
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Book chapters on the topic "Thermography"

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Gregory, Peter. "Thermography." In High-Technology Applications of Organic Colorants, 123–73. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4615-3822-6_9.

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Gooch, Jan W. "Thermography." In Encyclopedic Dictionary of Polymers, 744. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_11790.

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Turner, Tracy. "Thermography." In Equine Neck and Back Pathology: Diagnosis and Tre atment, 165–74. Oxford, UK: John Wiley & Sons, Ltd, 2018. http://dx.doi.org/10.1002/9781118974520.ch11.

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Mariprasath, T., Victor Kirubakaran, Perumal Saraswathi, Kumar Reddy Cheepati, and Prakasha Kunkanadu Rajappa. "Thermography." In Design of Green Liquid Dielectrics for Transformers: An Experimental Approach, 73–78. New York: River Publishers, 2024. http://dx.doi.org/10.1201/9788770042086-6.

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Gaussorgues, G. "Revision of Radiometry." In Infrared Thermography, 1–7. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0711-2_1.

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Gaussorgues, G. "Signal Processing." In Infrared Thermography, 319–39. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0711-2_10.

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Gaussorgues, G. "Characterisation of Infrared Systems." In Infrared Thermography, 340–78. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0711-2_11.

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Gaussorgues, G. "Imaging and Measurement." In Infrared Thermography, 379–96. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0711-2_12.

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Gaussorgues, G. "Choosing the Spectral Band." In Infrared Thermography, 397–413. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0711-2_13.

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Gaussorgues, G. "Industrial and Military Applications." In Infrared Thermography, 414–52. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0711-2_14.

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Conference papers on the topic "Thermography"

1

Nagasawa, Akinori, and Kazuichi Katoh. "Developmental thermography: panoramic thermography." In Medical Imaging 1993, edited by Rodney Shaw. SPIE, 1993. http://dx.doi.org/10.1117/12.154615.

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Nagasawa, Akinori, and Kazuichi Katoh. "Developmental thermography: triple aspect thermography." In Medical Imaging 1993, edited by Rodney Shaw. SPIE, 1993. http://dx.doi.org/10.1117/12.154618.

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Nagasawa, Akinori, and Kazuichi Katoh. "Developmental thermography: multiple aspect thermography." In Medical Imaging 1993, edited by Rodney Shaw. SPIE, 1993. http://dx.doi.org/10.1117/12.154616.

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Nagasawa, Akinori, Kazuichi Katoh, and Yasuhiko Ohhashi. "New thermographic imaging techniques: panoramic and multiaspect thermography." In Medical Imaging VI, edited by Rodney Shaw. SPIE, 1992. http://dx.doi.org/10.1117/12.59403.

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Wilcox, Logan M., and Kristen M. Donnell. "Void Detection in Foam Structures via Active Microwave Thermography." In ASNT Research Symposium 2023. The American Society for Nondestructive Testing Inc., 2023. http://dx.doi.org/10.32548/rs.2023.093.

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Active microwave thermography (AMT) is a coupled electromagnetic and thermographic technique that employs an electromagnetic excitation with subsequent infrared measurement of a structure under test. This work proposes AMT as a potential solution for void-type defect detection in foam structures backed by an electromagnetically lossy substrate. Such inspections are generally challenging for thermographic techniques due to the thermally insulating properties of foam itself. Using AMT, void defects were detected at multiple depths and varying cross-sections through a multilayer foam structure with a lossy substrate. Keywords: Active Microwave Thermography (AMT), Foam Inspection
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Ludwig, N., J. Melada, M. Gargano, L. Bonizzoni, M. Giudici, and T. Apuani. "Infrared thermography analysis of the ancient soapstone quarry in Chiavenna." In 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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Sagarduy-Marcos, D., A. Mendioroz, and J. Rodríguez-Aseguinolaza. "Dimensionless numerical sensitivity analysis of narrow cracks by means of infrared lock-in thermography." In 4th Asian Quantitative InfraRed Thermography Conference. QIRT Council, 2023. http://dx.doi.org/10.21611/qirt.2023.07.

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Lock-in infrared thermography has been identi?ed as a highly suitable technique for a quantitative defect charac-terization. In this work, first, a complete dimensionless reformulation of the thermographic investigation is provided. As a consequence, the constraints of particular experimental setups or material properties can be overcome preserving the full physical information of the experiment. The resulting model has been numerically solved and successfully validated by using experimental thermographic data. Second, the developed dimensionless model has been used as input for a global sensitivity analysis. Overall, the obtained results provide an experimental guideline for an optimized thermographic defect characterization.
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Klein, Matthieu T., Clemente Ibarra-Castanedo, Abdelhakim Bendada, and Xavier P. Maldague. "Thermographic signal processing through correlation operators in pulsed thermography." In SPIE Defense and Security Symposium, edited by Vladimir P. Vavilov and Douglas D. Burleigh. SPIE, 2008. http://dx.doi.org/10.1117/12.777002.

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Omar, Mohammed, Mohammed Hassan, Kozo Saito, and Ritchard Alloo. "IR Thermograph Inspection on Adhesion Integrity." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-61501.

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The infrared thermography offers a flexible, non-contact and non-destructive tool for investigating the adhesion integrity in different applications. The IR thermography technique has been demonstrated to have wide applications to testing and quality assurance in automobile manufacturing processes. This paper addresses the capability of IR thermography in evaluating the adhesion integrity for two cases which occurred during automobile assembly processes. They are the coated surfaces adhesion integrity inspection and the adhesion strength in welded composite polymer plastic joints. Analytical models for the above two cases will be discussed in comparison to the corresponding thermographs. IR thermography technique can be used with one of or combination of the following mechanisms: the transmitted, the pulsed reflected signals. This paper discusses what type of processing scheme can be best applied to each of these signals.
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Ljungberg, Sven-Ake. "Aerial Thermography - Cartographic Presentation Of Thermographic Data For Building Applications." In SPIE 1989 Technical Symposium on Aerospace Sensing, edited by Gregory B. McIntosh. SPIE, 1989. http://dx.doi.org/10.1117/12.953380.

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Reports on the topic "Thermography"

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Devito, Karina, and Karina D. Devito Americano. Can infrared thermography replace other methods for evaluating the presence and intensity of neurogenic and musculoskeletal orofacial pain in adult patients? A systematic review. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, March 2023. http://dx.doi.org/10.37766/inplasy2023.3.0091.

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Review question / Objective: To investigate the question "Can infrared thermography replace other methods for evaluating the presence and intensity of neurogenic and musculoskeletal orofacial pain in adult patients?", the following PECO question was formulated: P – Adult patients with a history of neurogenic and musculoskeletal orofacial pain E – Subjected to infrared thermography C – Submitted to other evaluative methods of presence and intensity of orofacial pain O – Correlation of infrared thermography with other evaluation methods of presence and intensity of orofacial pain.
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Barrett, Alan H. Improvements in Techniques of Microwave Thermography. Fort Belvoir, VA: Defense Technical Information Center, June 1985. http://dx.doi.org/10.21236/ada197064.

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Perez, Ignacio, and Paul Kulowitch. Thermography for Characterization of Corrosion Damage. Fort Belvoir, VA: Defense Technical Information Center, April 1999. http://dx.doi.org/10.21236/ada375755.

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Perez, Ignacio, paul Kulowitch, and Steven Shepard. Modeling of Pulsed Thermography in Anisotropic Media. Fort Belvoir, VA: Defense Technical Information Center, August 1999. http://dx.doi.org/10.21236/ada368628.

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Perez, Ignacio, Rachel Santos, Paul Kulowitch, and Steven Shepard. Modeling of Pulsed Thermography in Anisotropic Media. Fort Belvoir, VA: Defense Technical Information Center, January 1998. http://dx.doi.org/10.21236/ada350883.

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Perez, Ignacio, and Paul Kulowitch. Thermography for the Characterization of Corrosion Damage. Fort Belvoir, VA: Defense Technical Information Center, January 2000. http://dx.doi.org/10.21236/ada378009.

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Chen, Jian. Online Weld Quality Inspection System with Infrared Thermography. Office of Scientific and Technical Information (OSTI), September 2018. http://dx.doi.org/10.2172/1471927.

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Diebold, Gerald J. Sensitive Detection: Photoacoustics, Thermography, and Optical Radiation Pressure. Office of Scientific and Technical Information (OSTI), April 2017. http://dx.doi.org/10.2172/1352336.

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Lewis, Seth Robert. PBX-9501 High Explosive Infrared Thermography Test Report. Office of Scientific and Technical Information (OSTI), June 2019. http://dx.doi.org/10.2172/1526921.

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Durbin, P. F., N. K. Del Grande, K. W. Dolan, D. E. Perkins, and A. B. Shapiro. Dual-band infrared thermography for quantitative nondestructive evaluation. Office of Scientific and Technical Information (OSTI), April 1993. http://dx.doi.org/10.2172/10181259.

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