|
|
Modeling of Inertial Sensors
Trličík, Jakub ; Klusáček, Stanislav (referee) ; Beneš, Petr (advisor)
This master thesis deals with measurement and modeling of MEMS inertial sensors. This paper describes basic principles of inertial sensors along with their most often errors. The next part shows results from inertial sensor market analysis, which enabling a selection of sensors to be measured. The following two chapters present methods for inertial sensor modeling and testing. The biggest part of text is dedicated to presentation of measurement results showing us static measurement of Allan variance, Earth rotation, temperature dependent bias and dynamic measurement of gyroscope sensitivity testing over temperature. In the last part of the thesis is presented a design of sensor error model by autocorrelation function and Allan variance and also an evaluation of achieved results.
|
|
|
MRI Acquisition and Preprocessing of Image Sequences for Clinical Perfusion Imaging
Krchňavý, Jan ; Bartoš, Michal (referee) ; Jiřík, Radovan (advisor)
This thesis describes the theory for static and dynamic magnetic-resonance imaging using contrast agents affecting T1 relaxation time. The available acquisition methods in the specified facility of Masaryk Oncological Institute in Brno are described. The sequences for subsequent experimental measurements are selected. The used phantoms are described. Acquisition protocol for measuring is described briefly and the evaluation method for the measured data is suggested. The best acquisition sequence and a method of measurements is chosen influenced by estimation of relaxation time T1, sensitivity and signal to noise ratio. Perfusion analysis is executed and perfusion parameters are calculated. The work was supported by the European Regional Development Fund and the State Budget of the Czech Republic (RECAMO, CZ.1.05/2.1.00/03.0101).
|
|
| |
|
|
Tilt sensors
Hájek, Tomáš ; Caha, Luděk (referee) ; Beneš, Petr (advisor)
The topic of the Bachelor's thesis are MEMS sensors of inclination, which find their use inside integrated circuits, equipment of aerospace and automobile industry, but also in ordinary electrical appliance. The work serves the reader to build a grasp over production, usage, basic principles. Finally, it offers an overview of sensors to ease the orientation on the market. The design of the physical model, which can be used to prevent the sensor from apperance of mathematical errors, is tested in the practical part.
|
|
|
Qualitative comparison of MEMS vibration sensors
Hasík, Stanislav ; Havránek, Zdeněk (referee) ; Klusáček, Stanislav (advisor)
The aim of this bachelor thesis is a qualitative parameter validation of MEMS vibration sensors using calibration devices from the companies SPECTRA a Brüel & Kjr. First part of study deals with different types of MEMS vibration sensors on the piezoresistive, capacitive and thermal principle of operation. The study also deals with primary and secondary methods of calibration of vibration sensors and devices used for these calibration methods. The second part of the thesis is to use the calibration chains and secondary calibration methods to verify the sensitivity and temperature dependences of three particular MEMS accelerometers from the companies STMicroelectronic, MEMSIC and Panasonic. The measured characteristics are compared with catalog datasheets. In the end of the thesis are also discussed the possibility of the suppression these temperature effects.
|
|
| |
|
|
Classification and modelling of LED light sources in terms of sensitivity to supply voltage fluctuations
Hudáč, Tomáš ; Kukačka, Leoš (referee) ; Drápela, Jiří (advisor)
Cieľom tejto práce je preskúmať a charakterizovať celkovú odolnosť voči flickru v LED svetelných zdrojoch dostupných na súčasnom trhu, a vytvoriť modelu LED svetelného zdroja. Na nájdenie reprezentatívnych vzoriek LED svetelných zdrojov, bola prevedená analýza online trhu, ktorá ukazuje najpredávanejšie typy. Na základe výsledkov z analýzy sa získalo 31 vzoriek. S rôznymi LED technológiami a rôznymi možnosťami regulácie výkonu, napríklad bezdrôtovo alebo triakom. Vykonaním meraní za ideálnych podmienok napájania a rozobraním niektorých vzoriek boli celkovo identifikované 4 hlavné triedy s rôznymi topológiami napájacích obvodov. Ďalej sa vykonali testy ich citlivosti na blikanie a imunitou voči blikaniu. Na základe získaných výsledkov testov bola každá topológia ovládača ohodnotená podľa jej celkovej odolnosti voči blikaniu. V závere práce bol navrhnutý model v Simulinku, ktorý úspešne simuloval IH GF krivky v porovnaní s nameranými hodnotami
|
|
|
Electronic temperature measurement for a grill
Svoboda, David ; Burian, František (referee) ; Fiedler, Petr (advisor)
The work deals with methods of temperature measurement, electrical and non-electrical. Discussing the advantages and disadvantages of electrical methods of temperature measurement for applicability in the grill. It also discusses the selection of a suitable sensor to measure the temperature inside the grill. Subsequent design and implementation of the measuring system where the emphasis is on accuracy.
|
|
|
Design and verification of a thermodynamic sensor with a focus on high sensitivity
Staroštík, Petr ; Jankovský, Jaroslav (referee) ; Otáhal, Alexandr (advisor)
This work deals with the issue of using bolometers, calorimeters a thermo-dynamic sensor in measuring temperature and heat. In the case of bolometers and microcalorimeters are described their properties and limit parameters. The work focuses more closely on the construction of a thermodynamic sensor from discrete components with a focus on achieving high sensitivity. The sensitivity of the thermodynamic sensor was measured in an experiment with a defined heat change and evaluated. Using this experiment was set the measurement methodology, which was subsequently modified. As part of the bachelor's thesis was designed a new sensor for a thermodynamic sensor and was measured its sensitivity.
|
|
|
Indikátory zranitelnosti dopravy změnou klimatu
Mertl, Jan
Příspěvek je věnován vyhodnocení zranitelnosti dopravy ČR projevy změny klimatu, a to na základě indikátorů zranitelnosti. Metodickým základem indikátorů zranitelnosti je koncept zranitelnosti rozlišující tři základní komponenty zranitelnosti – expozici, citlivost a adaptační kapacitu.
Fulltext:  PDF
|
guest ::
