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Systém vzdáleného monitorování teploty / Remote temperature monitoring systemGál, Radek January 2018 (has links)
This project describes the design of the system for remote temperature monitoring of stored goods for horse-breeding. The main task of this system is the early alert before the fire developed to spontaneous combustion and continuous monitoring of this commodities .. The control panel communicates with several autonomous temperature sensors. The measured values are displayed on the display and transmitted over the Ethernet network to a server where monitored temperatures and their graphical waveforms can be viewed.
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Bezdotykové měření povrchových teplot ve strojírenství / Contactless measurement of surface temperatures in mechanical engineeringGorčica, Jakub January 2009 (has links)
This diploma thesis is focused on the theory of contactless measurement of surface temperatures with thermovision camera Flir SC2000 and on the principles of imaging the camera is based on. The tablets and the applications making work with camera easier are processed in the Visual Basic in practical part. The stand for fine taking emissivity is compiled and described, and emissivity of different materials and different milling cutters is taken in this diploma thesis.
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Klimatizační komora pro teplotní zkoušky / Conditioning Chamber for Thermal TestingBenáček, Martin January 2010 (has links)
Diploma thesis deals with measurement of temperature. The main goal of the thesis is to suggest and realize a Conditioning Chamber for Thermal Testing of small equipments and sensitive elements. The thesis is divided into theoretical and practical part. In the theoretical part are mentioned possibilities of miscue of measurement, equipments and sensitive elements for the measurement of temperature and their dividing. Furthermore, the measurement software and hardware is described for controlling and operating of the system. The practical part is detailing concept and realization of the setting of the Conditioning Chamber, which is controlled by graphical measurement software Control Web 6. The thesis is finished by exemplary measurement and is being service of practical approximation of the measurement test.
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Automatizované měření teploty v boji proti COVID / Automated measurements of body temperature against COVID-19Roman, Matej January 2021 (has links)
This thesis focuses on the development of an open source software capable of automatic face detection in an image captured by a thermal camera, followed by a temperature measuring. This software is supposed to aid in the COVID-19 pandemics. The developed software is independent of used thermal camera. In this thesis, I am using TIM400 thermal camera. The implementation of the face detection was achieved by an OpenCV module. The methods tested were Template Matching, Eigen Faces, and Cascade Classifier. The last-mentioned had the best results, hence was used in the final version of the software. Cascade Classifier is looking for the eyes and their surrounding area in the image, allowing the software to subsequently measure the temperature on the surface of one's forehead. One can therefore be wearing a face mask or a respirator safely. The temperature measuring works in real time and the software is able to capture several people at once. It then keeps a record of the temperature of each measured individual as well as the time of the measurement. The software as a whole is a part of an installation file compatible with the Windows operating system. The functionality of this software was tested – the video recordings are included in this thesis.
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Přesnost bezdotykového měření teploty / Accuracy of non-contacting Temperature MeasurementHorák, Ladislav January 2011 (has links)
This master’s thesis is specialized on the influence of correct parameters of emissivity, which depends on the temperature, wavelength and ambient environment. The investigation the parameter was taken infrared non-contact thermometer MI3 from company Raytek. To improve the quality of measurement was designed and programmed measuring utility program. The program was developed in the LabView 8.5 programming environment. To obtain the true value of the measured temperature of the target was designed and constructed the touch thermometer with the resistance dependent sensor. The thermometer is connected to the communication box of infrared thermometer and contain the same program. Nowadays are the most advanced IR thermometer with fixed parameters emissivity, which is applicable just to the real body in the vicinity of the parameter emissivity 0,95. For those IR thermometers were designed correction function, which would have temperature measured at a fixed emissivity parameter 0,95 set close to the actual value of the object.
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Etude de la convection naturelle turbulente en cavité verticale différentiellement chauffée : Analyse des structures et des transferts turbulents / Study of the Turbulent Natural Convection in a Differential Heated Cavity : Analysis of the Turbulent structures and TransfersBelleoud, Pierre 05 July 2016 (has links)
Les écoulements de convection naturelle en espace confiné sont généralement turbulents (grandes dimensions et/ou écarts de température importants). L'approfondissement de la connaissance de ce régime et des transferts qui y sont associés semble donc essentielle. Cette étude expérimentale concerne les mécanismes de transferts thermiques turbulents en s'appuyant sur des mesures couplées vitesse/température dans un écoulement de convection naturelle turbulente à haut nombre de Rayleigh (Ra1-1= 1,2x1011) au sein d'une cavité différentiellement chauffée de rapport de forme vertical (hauteur/largeur) égale à 4. Une chaîne de mesure PIV permet les acquisitions de vitesse tandis que la température est mesurée par micro-thermocouple de type K (0=12,7 μm). Les deux mesures étant synchronisées via un générateur de pulses type BNC®. Une attention particulière a été portée à la détermination des conditions aux limites en température des parois adiabatiques et au post traitement des données de PIV à l'aide d'une décomposition orthogonale basée sur l'énergie cinétique des champs de vitesse (POD). Cela a rendu possible, d'une part le calcul expérimental de quantités liées à la turbulence comme les flux d'enthalpie et des nombres adimensionnés pour la turbulence (Prandtl, diffusivité ... ) et, d 'autre part, l'évaluation de la contribution des autres termes des équations de Navier-Stokes (gradient de pression et terme source volumique). Enfin, une discussion sur les échelles caractéristiques de l'écoulement est menée et une comparaison avec des résultats de simulations numériques est apportée. / Natural convection flows in confined spaces are often turbulent (large dimensions and/or temperature difference ). Improving the knowledge of this type of regime and of the associated heat and mass transfers seems, therefore, to be essential. This experirnental work studies heat transfer mechanisms using coupled and synchronized measurernents of temperature and velocity in a turbulent natural convection flow at high Rayleigh number (Ra1-1=I.2 x1011) in a differentially heated cavity with a vertical aspect ratio (height/width) of 4. Velocity measurernents are acquired by PIV and temperature is measured with K-type micro-thermocouple (0=12.7 μm). Both measurementsystems are synchronized using a BNC® pulse generator. Thermal boundary conditions of the adiabatic walls and post treatment of PIV data using an orthogonal decomposition based on the kinetic energy of the flow - POD - have been considered with caution. It makes possible, on the one hand, the experimental assessment of turbulent quantities like enthalpy fluxes and dimensionless nurnber (Prandtl, diffusivity ... ) and, on the other hand the estimation of the contribution of the other terms of Navier-Stokes equations (pressure gradient and source term). Finally a discussion on characteristic scales of the flow and a comparison with numerical simulations are provided.
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[en] ANALYSIS OF THE DEMODULATION TECHNIQUE BASED ON FIXED FILTERS IN THE INTERROGATION OF FIBER BRAGG GRATING SENSORS / [pt] ANÁLISE DA TÉCNICA DE DEMODULAÇÃO BASEADA EM FILTROS FIXOS NA INTERROGAÇÃO DE SENSORES A REDE DE BRAGG EM FIBRAS ÓPTICASLUIZ CARLOS DA SILVA NUNES 31 August 2004 (has links)
[pt] A análise da técnica de demodulação usada para interrogar
sensores a rede de Bragg em fibras ópticas baseadas em
filtros fixos foi realizada teoricamente e
experimentalmente. Diferentes configurações de sistemas
foram analisadas modificando a posição espectral dos
filtros, assim como os níveis de potência óptica obtidos
nos fotodetectores. Foram realizadas medidas com o tempo
de
integração que variavam de 0.01 a 1s e estimado o limite
de
baixa freqüência. Comparação entre os resultados
experimentais e simulados mostram boa concordância, e
extrapolações indicam que seria possível chegar a uma
faixa
de medida da ordem de 7 nanômetros, com incertezas
equivalentes menores que 2 picometros, na medida da
posição
de pico do sensor. Foi feita uma análise da possibilidade
de utilização desta técnica para medida simultânea de
pressão e temperatura com uma única rede sensora. Na
realização experimental foi usado um transdutor de
pressão
que transferia uma força transversal à fibra,
proporcional
à pressão atuante, gerando birrefringência na região da
rede de Bragg. Foi possível obter valores de pressão com
a
faixa dinâmica de 400 psi com incerteza máxima de 4 psi e
simultaneamente temperaturas com variação de 28 a 50 graus Celsius
com
incerteza máxima de 0.1 graus Celsius. Adicionalmente, foram
estudados
os efeitos gerados em uma multiplexação temporal (TDM) de
sensores a rede de Bragg quando os sensores se encontram
superpostos na mesma posição espectral. Nesta análise é
confrontada a técnica de demodulação utilizando dois
filtros fixos com a técnica baseada na posição espectral.
Os resultados indicam que a técnica baseada em filtros
fixos apresenta vantagem, permitindo um número
significativamente maior de sensores. E também, foi
analisado o distúrbio provocado no espectro da rede
sensora
quando a fonte de luz usada para interrogar a rede tem
uma
modulação espectral que varia com a temperatura.
Finalmente, foi apresentado um sistema de multiplexação
(TDM/WDM), completamente polarizado, capaz de interrogar
dezenas de sensores a rede de Bragg escrito em fibras de
alta birrefringência. O sistema de multiplexação
consistiu
em uma chave óptica integrada, baseada em um
interferômetro
de Mach-Zehnder com configuração X-Y, e em um
espectrômetro
com um CCD linear como elemento de detecção. / [en] The analysis of a demodulation system for fiber Bragg
grating sensors based on two fixed spectral filters has
been carried out both theoretically and experimentally.
Different system configurations were analyzed by modifying
the spectral position of the filters as well as the optical
power-level of the signal reaching the two photo-detectors.
Measurements with integration times that varied from 0.01
to 1 second have been compared with the low frequency limit
predicted for long-term operation. Comparisons between
simulated and experimental results show good agreement, and
extrapolations indicate that it should be possible to
achieve a dynamic range of the order of 7 nanometers, with
uncertainties equivalent to less than 2 picometers, in
measurements of the sensor peak position. Applications
based on this system were carried out. An analysis of
simultaneous measurement of temperature and pressure with
only one FBG sensor using transducer of pressure to
transfer a lateral force to the fiber, proportional to the
applied pressure, generating birefringence at grating Bragg
region has been realized. The proposed system allowed to
measure pressure range of 400 psi with uncertain of 4 psi
and simultaneously temperature range of 22 Celsius Degree with uncertain
of 0.1 Celsius Degree. In addiction, generated effects in the temporal
multiplexing (TDM) of fiber Bragg grating sensors when the
sensor spectra are fully overlapped have been analyzed. In
this study, it is compared the demodulation technique based
on two fixed filters with the conventional technique based
on the peak position. The results show that the technique
based on fixed filters presents advantage to conventional,
allowing a greatest sensor number. It was also analyzed the
generated disturbance in the Bragg grating sensor spectrum
when the source used to interrogate the sensor has a
residual modulation which changes with the temperature. And
finally, a polarized multiplexing system (TDM/WDM) able to
interrogate a large number of Bragg grating sensors written
in high-birefringent polarization-maintaining fibers has
been realized. It is based on integrated-optic switch Mach-
Zehnder interferometer in X-Y configuration and a CCD line
array spectrometer.
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Decentralizovaný systém řízení vytápění budov / DCS for building controlKopeček, Petr January 2008 (has links)
This thesis deals with DCS for bulding control. The main aim was to develop a general system, which can be adapted according to the individual requirements and which should minimize costs too. Hardware modules, communication bus, communication protocol, system topology and regulation mechanisms, have been designed. Regulators have been set. There are introduced current realization and possible future extensions too. The high security and the high functionality topics are included.
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Energetické hodnocení krasobruslařské haly / Energy Evaluation of the Figure Skating HallŠicová, Pavlína January 2015 (has links)
The diploma thesis contains an energy audit of the figure skating hall. In the first part I focused on the analysis of the topic, fire regulations and laws relating to given theme, recent technical, theoretical and experimental solutions in practice. In the next part, I compiled the of building energy audit of building, including its mandatory annexes. In the last part, I presented the results of measurements in the evaluated object.
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Bestimmung lebensdauerrelevanter Parameter von IGBTs im Antriebsumrichter von ElektrofahrzeugenHiller, Sebastian 21 December 2022 (has links)
Die Arbeit beschreibt verschiedene technische Ansätze zur Bestimmung der Alterung der Chip-Substrat-Verbindung. Eine der Schlüsseltechnologien ist hierbei die Bestimmung der virtuellen Sperrschichttemperatur. Es werden in der Arbeit verschiedene Möglichkeiten zur Bestimmung der virtuellen Chiptemperatur von IGBTs und der Alterung der Chip-Substrat-Verbindung vorgestellt und mit ihren Vor- und Nachteilen in der Umsetzbarkeit und in der Anwendbarkeit im Umrichter diskutiert.
Besondere Betrachtung findet dabei unter anderem die technische Umsetzung einer Messmethode, die auf einer kurzzeitigen Belastung im aktiven Bereich mit anschließender Bestimmung des Abkühlverhaltens basiert. Über einen Vergleich mit dem ursprünglichen Abkühlverhalten ist es mit den vorgestellten Verfahren gut möglich, die Chipalterung zu detektieren.
Weiterhin wird ein Verfahren vorgestellt, das die Bestimmung der virtuellen Chiptemperatur im Umrichter über eine Ermittlung der Millerplateauhöhe im Abschaltmoment des IGBTs ermöglicht.:1 Einleitung
2 Alterung von Leistungshalbleitern
3 Stand der Technik der Chiptemperaturbestimmung in der Umrichterschaltung
4 Untersuchungen temperaturabhängiger elektrischer Bauelementparameter
5 Wichtige Verfahren zur Bestimmung der Chiptemperatur in der Umrichterschaltung
6 Untersuchung eines Verfahrens zur Bestimmung der Chiptemperatur in der Umrichterschaltung mittels Millerplateauhöhe
7 Technische Umsetzbarkeit der gezeigten Messverfahren
8 Zusammenfassung und Ausblick
A Anhang / This work describes different technical approaches to determine the aging of the chip-substrate interconnection. One of the key technologies here is the determination of the virtual junction temperature. Various possibilities for determining the virtual chip temperature of IGBTs and the aging of the chip-substrate interconnection are presented in the work and discussed with their advantages and disadvantages in terms of feasibility and applicability in the converter.
Special consideration is given to the technical implementation of a measurement method based on a short-term load in the active area with subsequent determination of the cooling behavior. By comparing this with the original cooling behavior, it is possible to detect chip aging with the methods presented.
Furthermore, a method is presented that enables the determination of the virtual chip temperature in the inverter via a determination of the Miller plateau height at the switch-off moment of the IGBT.:1 Einleitung
2 Alterung von Leistungshalbleitern
3 Stand der Technik der Chiptemperaturbestimmung in der Umrichterschaltung
4 Untersuchungen temperaturabhängiger elektrischer Bauelementparameter
5 Wichtige Verfahren zur Bestimmung der Chiptemperatur in der Umrichterschaltung
6 Untersuchung eines Verfahrens zur Bestimmung der Chiptemperatur in der Umrichterschaltung mittels Millerplateauhöhe
7 Technische Umsetzbarkeit der gezeigten Messverfahren
8 Zusammenfassung und Ausblick
A Anhang
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