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Scintillation SE detector fo environmental scanning electron microscope
Odehnal, Adam ; Čudek, Pavel (referee) ; Jirák, Josef (advisor)
This work contains theory about scanning electron microscopy. It describes construction, principle of operation and sinals generated by interactions between primary electron beam and specimen. Furthermore, it describes the most common method for detection of secondary electrons using scintillation detector. Next chapters are dealing with last development stage of scanning electron microscopy, which is environmental scanning electron microscopy. Experimental part is evaluating dependency of size of detected signal with scintillation detector on pressure of water vapor in specimen chamber. It also considers appropriate size of voltages enclosed on electrodes of the scintillation detector to optimize detection.
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Scintillation SE Detector for VP SEM
Kozelský, Adam ; Čudek, Pavel (referee) ; Jirák, Josef (advisor)
This work contains description of basic properties and principles of electron microscopy focused on scanning electron microscopy. It describes construction solutions of a microscope, interaction between electron beam and sample, generation of backscattered and secondary electrons. Next chapters are dealing with development of electron microscopy and environmental scanning electron microscopy. The experimental part of this thesis is focuses on the detection of secondary electrons with scintillation detector in environmental scanning electron microscope at higher pressure in the specimen chamber. Concretely is focused on optimization of collecting grid voltage and measurement of pressure dependences.
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Elemental composition analysis of inorganic materials
Szmek, Václav ; Richtera, Lukáš (referee) ; Zmrzlý, Martin (advisor)
This work deals with elemental analysis of inorganic materials, that are presented by blast furnace slag and geopolymeric material containing fly-ashes. In the theoretical part there are explained principles of elemental analysis of inorganic materials. Ways of dissolution of samples, optical emission spectroscopy and electron microscopy with energy dispersive x-ray analysis are commented. In experimental part the ICP analysis of oxide standards is described. The standards were used for estimation of EDS-correction factors. Then follow the preparation, proving and use of standards in analysis of blast furnace slag. The work is finished by exact analysis of concentration profiles of elements in interface of phases in geopolymeric material.
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Ionization Detector for Variable Pressure SEM
Černoch, David ; Špinka, Jiří (referee) ; Jirák, Josef (advisor)
This graduation theises deal with influence of an additional grating possitioned berween the sample and the ionisation detektor of the environmental scannin elektron microscope on signal detection. Signal level is measured for changing pressure, at different voltages on the aditional grating, at different sample - additional electrode distance and at different sample - detektor distance. Influence of the additional grating is simulated for real working conditions on PC.
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Method for evaluation of signal level value in environmental SEM
Kršňák, Jiří ; Tihlaříková, Eva (referee) ; Čudek, Pavel (advisor)
This work deals with the evaluating of the signal level value from the sample in the environmental SEM. In work there were processed the comparison of the osciloscopic method for the evaluating of the signal level value in the environmental SEM, the method for the evaluating of the signal level from the grey level of the sample images and the method for the evaluating of the signal level from the osciloscop. There are described the advantages and disadvantages of the methods and procedures for processing the methods.
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Scintillation SE detector fo environmental scanning electron microscope
Odehnal, Adam ; Čudek, Pavel (referee) ; Jirák, Josef (advisor)
This work contains theory about scanning electron microscopy. It describes construction, principle of operation and sinals generated by interactions between primary electron beam and specimen. Furthermore, it describes the most common method for detection of secondary electrons using scintillation detector. Next chapters are dealing with last development stage of scanning electron microscopy, which is environmental scanning electron microscopy. Experimental part is evaluating dependency of size of detected signal with scintillation detector on pressure of water vapor in specimen chamber. It also considers appropriate size of voltages enclosed on electrodes of the scintillation detector to optimize detection.
|
|
|
Scintillation SE Detector for VP SEM
Kozelský, Adam ; Čudek, Pavel (referee) ; Jirák, Josef (advisor)
This work contains description of basic properties and principles of electron microscopy focused on scanning electron microscopy. It describes construction solutions of a microscope, interaction between electron beam and sample, generation of backscattered and secondary electrons. Next chapters are dealing with development of electron microscopy and environmental scanning electron microscopy. The experimental part of this thesis is focuses on the detection of secondary electrons with scintillation detector in environmental scanning electron microscope at higher pressure in the specimen chamber. Concretely is focused on optimization of collecting grid voltage and measurement of pressure dependences.
|
|
|
Ionization Detector for Variable Pressure SEM
Černoch, David ; Špinka, Jiří (referee) ; Jirák, Josef (advisor)
This graduation theises deal with influence of an additional grating possitioned berween the sample and the ionisation detektor of the environmental scannin elektron microscope on signal detection. Signal level is measured for changing pressure, at different voltages on the aditional grating, at different sample - additional electrode distance and at different sample - detektor distance. Influence of the additional grating is simulated for real working conditions on PC.
|
|
|
Elemental composition analysis of inorganic materials
Szmek, Václav ; Richtera, Lukáš (referee) ; Zmrzlý, Martin (advisor)
This work deals with elemental analysis of inorganic materials, that are presented by blast furnace slag and geopolymeric material containing fly-ashes. In the theoretical part there are explained principles of elemental analysis of inorganic materials. Ways of dissolution of samples, optical emission spectroscopy and electron microscopy with energy dispersive x-ray analysis are commented. In experimental part the ICP analysis of oxide standards is described. The standards were used for estimation of EDS-correction factors. Then follow the preparation, proving and use of standards in analysis of blast furnace slag. The work is finished by exact analysis of concentration profiles of elements in interface of phases in geopolymeric material.
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