|
|
Preparation of sample cross-sections and analysis by SIMS
Karlovský, Juraj ; Pechal, Radim (referee) ; Bábor, Petr (advisor)
This thesis studies possible methods of semiconductor sample measurement by SIMS, with emphasis on testing different measurement parameters and sample preparation. Part of this master thesis deals with the design of a modified sample holder compatible with the used ToF-SIMS$^{5}$ instrument, IONTOF company, which is capable of tilting the sample by defined angle. This holder enables sample preparation in the main chamber of the instrument without the need of transferring the sample between instruments, which limits the probability of sample contamination. This sample holder was tested by ion machining of TIGBT sample edge and by imaging of a crater edge, created in previous measurement. Edge termination structures prepared by different techniques were measured on the TIGBT samples. Further measurements with the goal of optimizing the depth resolution for thin layers were done on Molybdenum-Silicon-multilayer X-Ray Mirror. Part of the measurements was focused on comparing depth profiles measured at low temperatures. For these measurements the samples with Indium multilayers in GaN substrate were used.
|
|
|
Theremin: Touchless Musical Instrument
Baštýř, Lukáš ; Šimek, Václav (referee) ; Strnadel, Josef (advisor)
This bachelor thesis deals with the design and implementation of a digital touchless musical instrument theremin. In the first part, the theremin, its features and existing solutions are first documented. The second part focuses on the documentation and testing of the software and hardware that can be used to solve this thesis. The penultimate part focuses on the actual implementation of the instrument and the creation of a working prototype. The final section tests functionality of the final prototype instrument.
|
|
|
Determination of organic compounds in biochar produced by microwave torrefaction of biomass
Meindl, Jiří ; Vávrová, Milada (referee) ; Mravcová, Ludmila (advisor)
The thesis is focused on a determination of polycyclic aromatic hydrocarbons (PAHs) contained in dried pelletized sewage sludge and pelletized biochar. Biochars were made in mild conditions by microwave torrefaction of prepared sewage sludge. There were analyzed and quantified the 34 of standardized PAHs compounds in two series. The first serie, also called “Sada 1”, has been aimed at comparison of extraction methods for the chosen sample of sewage sludge and the sample of biochar. In serie “Sada 1”, there were compared efficiencies of chosen type of solvent or solvent mixture by comparison of yields for 34 standardized analytes in a sample of biochar and a sample of sewage sludge. There were compared also to total yields of PAHs and to number of quantified compounds in analyzed samples. The most reliable extraction method has been used for the next analyses of samples in the second serie called “Sada 2”. In Sada 2, there were compared different samples of the same type (e.g. biochar, sludge). The origin of sewage sludge (small or big sewage treatment plant expressed as PE) and used additives (cellulose, chaff, hay) as modificators for torrefaction process were variables for different type of sample. The results of analysis were identification of the most suitable sewage sludge and additive to be used as modificator for microwave torrefaction process. The main goal of correctly chosen sludge and additive was to minimize production of PAH’s during torrefaction and in samples of biochar.
|
|
|
Optical Proximity Sensor with Time-of-Flight Measuring Principle
Mlatecová, Hana ; Kopečný, Lukáš (referee) ; Žalud, Luděk (advisor)
3D optical proximity scanner is described in this thesis. The sensor is marked as 03D201 and is made by Ifm electronic, GmbH company. The text also describes the basic characteristics, measuring principle, PC connection method and communication. A program for communication between PC and sensor was created and named O3D_Application. This program provides functions for real-time data transfer and visualization. Measured data can be saved easily by this program. The thesis also contains an analysis of measured data and parasitic parameters of the sensor.
|
|
|
Microwave radar sensor data processing focused on detecting the trajectory of people
Uher, Adam ; Slováček, Miroslav (referee) ; Valach, Soběslav (advisor)
This bachelor ‘s thesis deals with a topic of people detection and tracking their movement in regions of interest. The individual methods that can achieve people detection are analyzed. To implement people detection and tracking their movement microwave radar sensor IWR6843AoPEVM from Texas Instruments is chosen for this task. This hardware and its software are described in detail. Then simulation is conducted to track people in a queue and its results are evaluated. Different advantages and disadvantages of individual methods are compared with each other. Finally, there’s a summary of possible implementations for this device and target platform is chosen to verify its functionality.
|
|
|
Growth ultrathin of layers Au
Beránek, Jiří ; Kolíbal, Miroslav (referee) ; Mach, Jindřich (advisor)
The aim of this thesis is to study growth of ultrathin gold layers prepared by MBE (Molecular beam epitaxy) in UHV conditions. Differently modified sillicon served as a substrate and depositions were done at different temperatures of a substrate. Samples were analyzed by ToF LEIS for thickness, morfology was examined by SEM and AFM. X-ray photoelectron spectra were taken for chemical analysis. Gathered data together with their evaluation contribute to description and understanding of some processes during deposition and subsequent exposure of the sample to high temperatures. Experimental data and conslusions also prowide basis for further experiments and development of potential applications.
|
|
|
2D and 3D analysis of semiconductor devices by SIMS
Vařeka, Karel ; Šamořil, Tomáš (referee) ; Bábor, Petr (advisor)
The chemical analysis of semiconductor structures using the SIMS method is the main part of this bachelor thesis. It allows the user to make a depth profiling and a creation of 2D or 3D material images. During the analysis of the chip from the TIGBT semiconductor, there is a sputtering of a heterogeneous structure in the material with different sputtering rates. It is convenient to make a cut through the material using a focused ion beam to create a profile, which grants the user to perform a tomographic measurement. This new surface enables a chemical analysis of a depth profile of semiconductor structures without the need for sputtering beam in dynamic SIMS mode. By reconstructing individual two-dimensional images, it is possible to assemble a three-dimensional pattern of the analysed sample area. Also, the preparation and removal of the lamella from the TIGBT chip were accomplished and analysed via a detector of transmission electrons.
|
|
|
Drone localization and navigation in a familiar environment without GNSS
Pintér, Marco ; Janoušek, Jiří (referee) ; Raichl, Petr (advisor)
This thesis is aimed at development of the localization system without using GNSS. The first part describes technologies, enable determination of position in the area. Methods for determining distance between transmitter and receiver are also described. In the next part of the thesis describes ROS communication form with flight controller PixHawk. On the basis of the acquired knowledge is described choosage of preferred technology and method of determination of the distance between transmitter and receiver.
|
|
|
Theremin: Touchless Musical Instrument
Baštýř, Lukáš ; Šimek, Václav (referee) ; Strnadel, Josef (advisor)
This bachelor thesis deals with the design and implementation of a digital touchless musical instrument theremin. In the first part, the theremin, its features and existing solutions are first documented. The second part focuses on the documentation and testing of the software and hardware that can be used to solve this thesis. The penultimate part focuses on the actual implementation of the instrument and the creation of a working prototype. The final section tests functionality of the final prototype instrument.
|
|
|
Microwave radar sensor data processing focused on detecting the trajectory of people
Uher, Adam ; Slováček, Miroslav (referee) ; Valach, Soběslav (advisor)
This bachelor ‘s thesis deals with a topic of people detection and tracking their movement in regions of interest. The individual methods that can achieve people detection are analyzed. To implement people detection and tracking their movement microwave radar sensor IWR6843AoPEVM from Texas Instruments is chosen for this task. This hardware and its software are described in detail. Then simulation is conducted to track people in a queue and its results are evaluated. Different advantages and disadvantages of individual methods are compared with each other. Finally, there’s a summary of possible implementations for this device and target platform is chosen to verify its functionality.
|
guest ::
