Dissertations / Theses on the topic 'Surface thermometry'
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Suda-Cederquist, Keith David. "Near-Wall Thermometry via Total Internal Reflection Fluorescence Micro-Thermometry (TIR-FMT)." Thesis, Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/14530.
Kim, Myeongsub. "Microscale optical thermometry techniques for measuring liquid phase and wall surface temperatures." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/43754.
Khalid, Ashiq Hussain. "Development of phosphor thermometry systems for use in development gas turbine engines." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/development-of-phosphor-thermometry-systems-for-use-in-development-gas-turbine-engines(f01316f9-4622-4a6d-b2d0-611a9191b5eb).html.
Hashemi, Jazi Seyed Amir [Verfasser], Christoph J. [Akademischer Betreuer] Brabec, Lars [Gutachter] Zigan, and Christoph J. [Gutachter] Brabec. "A Contactless Solid Surface Temperature Determination Using Phosphor Thermometry / Seyed Amir Hashemi Jazi ; Gutachter: Lars Zigan, Christoph J. Brabec ; Betreuer: Christoph J. Brabec." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2021. http://d-nb.info/1237107814/34.
Chadli, Saïd. "Modélisation et réalisation d'un multicapteur microcontrôlé à couches minces, pour la mesure ambulatoire des températures de surface." Rouen, 1993. http://www.theses.fr/1993ROUES037.
Katz, Amandine. "Développement du thermomètre Δ47 appliqué sur coccolithes : de la calibration en laboratoire à l’applicabilité au registre sédimentaire." Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCC187.
The Δ47 geothermometer relies on the relationship between the 13C–18O abundance in carbonateand temperature of calcification. This proxy has the potential to overcome limitations of other thermometers(δ18O, Mg/Ca) to reconstruct oceanic paleotemperatures. This thesis evaluates for the first time the potentialand the limitations of the Δ47 thermometry of the coccoliths, the calcareous nannofossils produced byorganisms calcifying in the photic zone. These calcitic and ubiquitous biominerals represent an importantpart of the sedimentary archive. In vitro cultures allow us to establish that three modern coccoliths speciesrecord the same Δ47–T relation than inorganic calcite, although exhibiting substantial δ18O vital effects(±5‰). We conclude that these coccoliths species do not present any Δ47 vital effect. We subsequentlyapplied the Δ47 proxy to sediments from the Toarcian oceanic anoxic events (–183 Ma) during which thetemperatures reconstructions are still elusive, mainly due to the unknown oxygen isotopic composition ofseawater. On the basis of our Δ47 data, we infer relatively high, yet steady temperatures (around 36°C) duringthe examined interval. By combining these Δ47-derived temperatures to carbonate δ18O data, we can suggestdrastic change in the seawater δ18O composition in the Paris Basin at the onset of black shale deposition. Acore top calibration of Δ47 of coccoliths revealed that one of the studied cultured species exhibits Δ47disequilibrium that is accountable by other environmental parameters, such as light irradiance in the naturalenvironment. Thus, this thesis illustrates the potential of the coccolith Δ47 thermometer in different settings,opening a wide range of application to reconstruct the palaeoenvironments over the Meso-Cenozoic Eras
Lechner, Valentin. "Experimental study of LOX/CH4 flames in rocket engines." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPAST040.
Using methane as a fuel in rocket engines would have many advantages but the combustion with pure oxygen at high pressure remains poorly understood. From a thermodynamic point of view, methane and oxygen share very similar critical point values, making it challenging to predict propellant mixing, flame anchoring, stability and structure. Moreover, when methane is injected in excess, aerosols can be produced, which can clog the lines, damage the turbine, and reduce the efficiency.Therefore, a thorough update of the knowledge of LOX/CH4 combustion is necessary. These challenges are tackled within the consortium composed of EM2C laboratory, ONERA, CNES, and ArianeGroup. Two test campaigns are carried out at the MASCOTTE facility from ONERA, aiming to study three central topics: the flame structure, wall heat transfers, and aerosol production. To this end, various experimental diagnostics are implemented simultaneously during high-pressure hot-fire tests.Various imaging diagnostics are implemented to analyze the flame structure and the dense liquid jets. Despite the acquisition difficulties encountered in these extreme conditions, the analyses reveal a complex flame structure. In the subcritical regime, atomization and evaporation mechanisms dominate. The flame is much more opened and longer than at higher pressures, where diffusive mixing mechanisms prevail. Characterizing flame anchoring remains a challenge. A water ice ring surrounding, and masking, the flame foot has been identified. Formation mechanisms are proposed, and a growth/destruction temporal cycle is highlighted. Its presence strongly affects flame visualizations, and may lead to misinterpretations of its topology.Laser-induced phosphorescence (LIP) is implemented for the first time at MASCOTTE. Various LIP methods exist, but they are not well suited to the MASCOTTE conditions: wide temperature range, thermal transients, and two-phase flow environment favoring laser absorption/diffusion. Therefore, a specific method, the Full Spectrum Fitting method (FSF method), has been developed. It exploits the spectral dependence on temperature, enabling instantaneous measurements from 100 to 900 K with a precision of 17 K, with no dependence on the laser excitation energy. A detailed data analysis highlights the predominant wall heat transfer modes, studies the influence of the operating points, and compares the experimental data with a wall heat transfer model, which is particularly well suited for deducing the convective properties of the flow.Three diagnostics are used to characterize aerosols. An intrusive probe samples particles and burnt gases downstream of the flame. The particles are sampled on TEM grids and analyzed by Transmission Electron Microscopy. Detailed images of the aerosol morphology reveal that the particles are soot. Combustion products are analyzed by gas chromatography. This makes it possible to identify soot precursor molecules such as benzene and acetylene. Soot are quantified temporally by laser extinction. A dedicated post-processing method is developed and various hypotheses are discussed to explain the spatial variations of the soot production downstream of the flame
RIBEAUDEAU, MARION. "Elaboration et caracterisation de films de niobium deposes sur cuivre. Determination de la resistance de surface de supraconducteurs par thermometrie sous vide." Paris 6, 1999. http://www.theses.fr/1999PA066429.
Park, Keunhan. "Thermal Characterization of Heated Microcantilevers and a Study on Near-Field Radiation." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/14597.
Hsieh, Tsung-Lin, and 謝宗霖. "Suitiability of Multispectral Radiation Thermometry (MRT) Emissivity Models Predicting Aluminum Alloy Surface Temperature." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/74629552045644137961.
國立成功大學
機械工程學系碩博士班
96
Experiments are conducted to investigate the surface emissivity characteristics for five different aluminum alloys, AL1100、AL2024、AL5083、AL6061、AL7005 at 600K, 700K and 800K. Six multispectral radiation thermometry (MRT) emissivity models, HRR, IST, IST* (another form of IST), IWS, WLT and WLT* (another form of WLT) are examined for the suitability of predicting aluminum alloy surface temperature. The goal of this study is to find the best MRT emissivity model which can well compensate the aluminum emissivity variations and accurately infer temperature. Wavelength range from 2.91μm to 4.13μm is chosen because of the high stability in emissivity measurement. For aluminum emissiveity behaviors, (1)overall, emissiveity decreases with increasing wavelength; (2)emissivity decreases between 600K and 700K, but increases between 700K and 800K. Increase in emissivity is contributed to the surface oxidation and discoloration which cause the surface color change from light gray to dark black; (3) at high temperature, aluminum alloys with more magnesium constituent cause the increase in emissivity which results in a much stronger alloy effect; (4)emissivity reaches steady state after the 2nd hour due to the surface oxidation becoming fully developed. For the examination of MRT emissivity models on aluminum, (1)most models achieve high accuracy in temperature prediction, except IWS and WLT emissivity models. HRR shows the best overall performance and stability; (2)for least-squares technique, the closer the inferred emissivity value and real one, the more accurate inferred temperature; (3)increasing wavelength number does not significantly improve measurement accuracy while applying MRT. However, compared with SRT and DWRT, MRT indeed provides better performance; (4)overall, constant emissivity value acquired with increasing heating time enhances temperature prediction; (5)results from the error analysis show good stability of experimental operation and MRT emissivity models predicting aluminum alloy surface temperature.
Weng, Kang-hsien, and 翁亢賢. "Oxidation Effect on Surface Temperature Determination using Multispectral Radiation Thermometry for Aluminum Alloys." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/64548535849067943395.
國立成功大學
機械工程學系碩博士班
97
In this study, experiments were conducted to examine the effect of surface oxidation on emissivity. The spectral emissivity were measured under an open-air heater system and a high-vacuum heater system for five different aluminum alloys (AL1100、AL2024、AL5083、AL6061、AL7005) at three temperatures (600 K、700 K、800 K). Eight emissivity models were used to examine the Multispectral Radiation Thermometry (MRT) for aluminum alloys in order to understand the effect of surface oxidation on temperature determination and find the best MRT emissivity model as well. For aluminum alloys emissivity behaviors, overall similar trends are found under oxidized and unoxidized conditions. (1) Emissivity decreases with increasing wavelength. (2) Emissivity increases with increasing temperature. The emissivity of oxidized sample is higher than that of unoxidized sample and this demonstrates that oxidation causes the increase in emissivity. (3) The emissivity of unoxidized sample doesn’t change with time. However, the emissivity of oxidized sample increases due to the growing oxide layer with time. For the examination of MRT emissivity models on aluminum alloys, (1) since the effect of oxidation changes the emissivity behaviors, different best models are found under conditions with and without oxidation. (2) Models having the percentage of average inferred temperature error under 4% are found for both oxidized and unoxidized samples. Therefore, MRT is suitable and applicable for aluminum alloy temperature determination. (3) For least-squares technique, the closer the inferred emissivity value and real one, the more accurate inferred temperature. (4) More accurate temperature measurement by MRT can be achieved in higher temperature. (5) Increasing number of wavelength doesn’t improve measurement accuracy while applying MRT. Therefore, it is sufficient to employ the required minimum number of wavelengths to save the time on computation. (6) Overall, three emissivity models, HRR、IST and WLT*, are able to achieve high accuracy in temperature prediction for both oxidized and unoxidized heating systems, especially HRR under oxidized condition and WLT* under unoxidized condition.
Qu, Yan. "Silicon wafer surface temperature measurement using light-pipe radiation thermometers in rapid thermal processing systems." Thesis, 2006. http://hdl.handle.net/2152/2794.
Puttitwong, Ekachai. "Factors affecting the precision and accuracy of surface temperature measurement using light-pipe radiation thermometers (LPRTs)." Thesis, 2006. http://hdl.handle.net/2152/3475.
Chung-WeiTsai and 蔡宗偉. "Application of Plate Thermometer to Measure Ultra-high Surface Temperature of High Purity Metals Melted by Electron Beam." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/89505744025274681703.
Botas, Alexandre Manuel Pedroso. "Photoluminescence of crystalline silicon nanoparticle systems." Doctoral thesis, 2019. http://hdl.handle.net/10773/27720.
O entendimento das propriedades de luminescência do silício à escala nanométrica é uma questão relevante para o desenvolvimento de novos dispositivos emissores de luz. Neste âmbito, esta tese foca o estudo das propriedades de emissão de nanopartículas cristalinas de silício, com diferentes terminações da superfície (hidrogénio, óxido de silício ou moléculas orgânicas), utilizando espectroscopia de fotoluminescência em modo estacionário e resolvido no tempo e medidas de rendimento quântico de emissão. À temperatura ambiente, os espectros de emissão das nanopartículas terminadas com hidrogénio e funcionalizadas com moléculas orgânicas, com tamanhos médios de ≈3.4 e ≈2.4 nm, apresentam uma componente centrada, respetivamente em ≈800 e ≈750 nm. Esta componente é atribuída à recombinação de excitões fotogerados no núcleo de silício da nanopartícula. Uma componente adicional, a maiores energias, está presente no espectro de nanopartículas com óxido de silício à superfície, sendo atribuída à recombinação de pares dados-aceitador de estados associados ao óxido. Os valores medidos para os tempos de vida de emissão e para o rendimento quântico de emissão dependem da terminação da superfície e são discutidos, através da transferência de excitões intra- e inter-nanopartículas. O valor mais alto de rendimento quântico de emissão à temperatura ambiente para amostras em filme foi medido para nanopartículas com funcionalização orgânica (0.23±0.02). Uma outra vertente do trabalho, envolveu filmes de nanopartículas de silício infiltrados com Al2O3, utilizando deposição em camadas atómica. A camada depositada permite proteger os filmes contra a oxidação e observa-se uma alteração do espectro de emissão das nanopartículas, relativamente a nanopartículas análogas sem infiltração. Este trabalho abre novas questões sobre o papel da terminação e separação entre nanopartículas no que respeita às propriedades de emissão. Tirando partido da dependência da emissão com a temperatura foi desenvolvido um termómetro primário inovador. Em particular, é mostrado que termómetros luminescentes baseados em nanopartículas de silício processadas em filme e em solução podem operar em diversos ambientes com um parâmetro termométrico (energia do pico de emissão) descrito por uma equação de estado bem estabelecida. O termómetro apresenta uma reversibilidade e repetibilidade superior a 99.98%, e um valor máximo para a sensibilidade térmica relativa de 0.04 %.K−1.
Programa Doutoral em Física