|
|
Bearing diagnosis of electrical motors
Kratochvíl, Lumír ; Janda, Marcel (referee) ; Vítek, Ondřej (advisor)
This work breaks down the individual phenomena and findings that have as a common denominator the emergence of irreversible processes leading to damage to bearings in electrical machinery and equipment. The introduction describes the basic description and division of bearings with the recommended methods of their basic operation. The following chapters then deal with the individual sources of damage, diagnostics of individual damages, or examine in more detail the accompanying phenomena of bearing damage. In the first practical part of the work, damaged bearings are physically analyzed and their diagnostics is performed on an electron microscope. The second part of the work deals with vibrodiagnostics and the use of appropriate methods to determine the condition of the rolling bearing and then the location of the source of vibration at error frequencies.
|
|
|
Ray Tracing for Electron Microscope
Suchánek, Jan ; Lysek, Tomáš (referee) ; Čadík, Martin (advisor)
This thesis is pointed on simulation of electron microscope. It uses knowledge from ray-tracing methods and physically based rendering with physics of electron microscopy. The main object of this thesis is to create realistic simulator for electron microscope which can generate satisfying realistic images. This output can be used for another research in range of machine learning or microscope application development. This method should replace long and more expensive way of getting test images from real system for those research activities.
|
|
|
Conceptual design of a precision manipulator
Stuchlík, Petr ; Pavlík, Jan (referee) ; Vetiška, Jan (advisor)
This diploma thesis deals with the problems of analysis and the subsequent design of a precision manipulator used as a microscope table. The first part od the final thesis deals with the problems associated with the movement of the test sample within the electron microscope. Subsequently, possiblle design variants were proposed, further developing the next steps fot the correctness and functionality of manipulator. The individual force loads of the components were calculated. The result of the work was constructed as a CAD model with subsequent transfer to the assembly drawing.
|
|
|
Using Computer Aided Engineering for analyse the detector
Vyroubal, Petr ; Polsterová, Helena (referee) ; Maxa, Jiří (advisor)
This master's thesis deals with influence of the shape comparison of convergent and Laval nozzles in the secondary electron detector shutters to the resulting pressure and gas flow in the secondary electron detector for environmental scaning electron mictoscope. To the detector analysis are used Computer Aided Engineering systems CAD and CAE, SolidWorks and SolidWorks Flow Simulation.
|
|
|
Contrast in image acquired by ionization detector in VP SEM
Goroš, Pavel ; Čudek, Pavel (referee) ; Jirák, Josef (advisor)
This work deal with problems of investigation materials electron beam. This project is focuses on investigation materials by the help of method environmental scan electron microscopy (ESEM) and describes her patterns. The perfection of ESEM excel above all at studies non - conducting or water containing, often biological samples. These samples not to be in no way prepared or cut – and – dries, in contradistinction to classical scanning electron microscope and thanks is under investigation their native surface structure without desiccation breaking. The general aim is determination of contrast in image acquired by ionization detector.
|
|
|
Analysis of the supersonic flow of gas in the differentially pumped chamber EREM
Matloch, Roman ; Vyroubal, Petr (referee) ; Maxa, Jiří (advisor)
This work describes briefly electron microscopy issue and physical model of fluid flow. Then presented diploma thesis will be describing analysis and evaluation of the impact of supersonic flow on the pressure and density in the path of the primary electron beam in the differential pumping chamber. For analysis, evaluation and examination of the issue will be used CAD and CAE (Computer Aided Engineering) programs. At the same time it will be developed a methodology of calculation applicable to supersonic flow in the low pressure system at ANSYS CFX.
|
|
| |
|
|
Generation and applications of pulsed beam in an electron microscope
Nekula, Zdeněk ; Kozák,, Martin (referee) ; Kolíbal, Miroslav (advisor)
Elektronové mikroskopy jsou celosvětově využívány jak v průmyslu, tak i v základním výzkumu. Tato diplomová práce popisuje, jak použít malé elektrostatické deflektory pro vysoké časové rozlišení v prozařovacích (TEM) i skenovacích (SEM) elektronových mikroskopech. Zde popsaná metoda pro transmisní mikroskopy je nové řešení využívající efekt "streak" kamery. Tento přístup vyniká svojí jednoduchostí, sub-pikosekundovým časovým rozlišením a flexiblilním časovým rozsahem. Dále ve skenovacích mikroskopech je využit malý elektrostatický deflektor pro tvorbu pulzního elektronového svazku. Tento pulzní svazek se používá pro časové rozlišení pomocí stroboskopického efektu. Pro skenovací mikroskopy tato diplomová práce ukazuje dvě nové metody jak měřit délku elektronových pulzů a taky dvě aplikace časově rozlišené detekce. Jsou to časově rozlišený potenciálový krontrast a časově rozlišené elektrické pole.
|
|
|
Design of micromanipulator for scanning electron microscope
Palouda, Adam ; Dostál, Zbyněk (referee) ; Nováček, Zdeněk (advisor)
This thesis describes the process of design, manufacture and testing of a device for the detection of cathodoluminescent effect in scanning electron microscope. Firstly, it summarizes the basics of electron microscopy, specifically the design and manufacture of vacuum systems. It also deals with ways of using 3D printing in the prototyping of vacuum components. Then it describes the process of development of a device, which enables the user to measure cathodoluminescence in an electron microscope. The device consists of a feedthrough for optical fibre and a micromanipulator which allows the user to position the tip of the fibre to the sample. The signal from the fibre is processed in a photomultiplier for which a case is designed as a part of this thesis, or in a spectrophotometer. During the development process the device is being tested by performing some measurements and is adjusted to increase functionality and user comfort.
|
|
| |
guest ::
