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Evaluation of gas flow in the scintillation detector at different profiles and sizes of holes in the screens that have shaped the network
Truhlář, Michal ; Špinka, Jiří (referee) ; Maxa, Jiří (advisor)
This work deals with the flow of gas in the scintillation detector. Thesis describes the function of an electron microscope, the composition, distribution and development of microscopes from the earliest to modern. The work also includes familiarization with SolidWorks 3D modeling in which is the electron microscope modeled and Cosmos FloWorks in which they are carried out simulations of gas flow. The paper is focused on the flow of gas in various shapes of the screen and various pressures in chamber of specimen. The results of the analysis of both apertures variants are compared with the request to minimize the pressures in the trajectory of the secondary electrons of well as in the chamber of specimen.
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Using Computer Aided Engineering for analyse the detector
Novotný, Marek ; Špinka, Jiří (referee) ; Maxa, Jiří (advisor)
This diploma thesis deals with electron microscopy. Examined equipment is environmental scanning electron microscope (ESEM), namely scintillation a detector of the microscope. There is solved the influence of the profile of holes in diaphragms to the resulting pressure and gas flow on the path of secondary electrons at the detector. Introductory part of thesis informs about microscopy in general, with concentration on electron microscopy; especially on scanning microscope, because research is taken just on the environmental scanning electron microscope. Another part informs about both general principles of dynamics of gases and with finite volume method. Another part deals with concrete used software and with setting of individual parameters for calculation. At the beginning of calculation are used five basic profiles of holes in diaphragms for pressure 1000 Pa in the chamber of the sample. For modelling individual shapes is used 3D parametric modeller SolidWorks. Analysis of circulation of secondary electrons through detector is made by using Cosmos FloWorks module. The most suitable type of diaphragms is chosen from measured models. Another part of diploma thesis deals with measuring of chosen types of diaphragms for more pressures in the chamber of the sample; the pressure is 200, 400, 600, 800 and 1000 Pa. The outcomes of this research are both models of pressure and speed of circulation inside the detector and graphically processed values by using different diaphragms, respectively one type of a diaphragm in different pressures. Production drawings of each diaphragm, together with calculated models, are enclosed.
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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.
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Using Cosmos FloWorks for analyse the detector.
Hladík, Jaroslav ; Špinka, Jiří (referee) ; Maxa, Jiří (advisor)
This work follow up gas fluxion problems in detector chamber of enviromental scanning electron microscope. Describes basic electron microscopes characteristic and evaluation output signal. Basic focus of this work is proposal placing screening in detector in surroundings programme SolidWorks 2008. There is by the help of system COSMOS FloWorks effected analysis pumping gas with different pressure and mutual position which has significant influence in given fluxion conditions. Programmatic surroundings makes it possible to simulation 3D and evaluation fluxion method final capacities by setting fundamental conditions of solving, which would have been next to real behaviour of gas in real detector.
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Comparison of flow conditions in the gas detector used in the aperture and screen
Hubáček, Jiří ; Špinka, Jiří (referee) ; Maxa, Jiří (advisor)
The first part of the thesis deals with electron microscopy and physical model fluid flow. In the next part, a three-dimensional model is created in programme SolidWorks. It is the model of scintilating detector with aperture or screen with three hundred little apertures. These models are submitted to analysis focusing on investigation of the gas flow at different pressure in chamber of specimen ESEM using Cosmos FloWorks system. The results of the analysis of both apertures variants are compared with the request to minimize the pressure in the trajectory of the secondary electrons as well as in the chamber of specimen.
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Using Cosmos FloWorks for analyse the detector.
Bordovský, Petr ; Špinka, Jiří (referee) ; Maxa, Jiří (advisor)
This work deal with the analysis of influence of pressure‘s sizes in vacuum chamber of specimen Evironmental Scanning Electron Microscope and the influence of sizes of aperture diaphragm by scintillation detector. The analysis proceeds in detector of secondary electrons. The detector is modelled by system 3D CAD SolidWorks with the help of system CAE Cosmos FloWorks.
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Use of Cosmos FloWorks for analysis of the scintillation detector for EREM
Ambrož, Václav ; Špinka, Jiří (referee) ; Maxa, Jiří (advisor)
The paper briefly outlines high-pressure electron microscopy and then uses SolidWorks to model the scintillation detector, analysing pumping of gas in the EREM sample chamber at different pressure levels using Cosmos FloWorks. The results of the analysis are assessed with regard to minimising pressure in the trajectory of the primary electron beam in order to prevent dissipation of electrons on the gas molecules.
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