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3D analysis of dental and skeletal changes after dental and orthodontic treatment
Nocar, Adam ; Dostálová, Taťjana (advisor) ; Hubálková, Hana (referee) ; Koberová Ivančaková, Romana (referee)
3D analýza dentálních a skeletálních změn po zubní a ortodontické terapii Abstrakt Předkládaná disertační práce popisuje možnost využití 3D analýzy a 3D technologií ve stomatologické a ortodontické praxi. Analýza změn je dále popsána ve dvou konkrétních pracích, a to přesně zabývající se laserově tvrzenými 3D vytištěnými modely v ortodoncii a změnami po laserovém bělení zubů. Cílem první práce je analýza změn po ortodontické terapii z pohledu stability modelů vytištěných stereolitografií (SLA) ve srovnání s tradičními sádrovými odlitky po dobu tří let. Experimentální soubor dat se skládal z 36 ortodontických pacientů, z nichž každý měl modely vytištěné pomocí SLA a sádrové odlitky pro horní i dolní čelist, což vedlo k získání celkem 72 skenů ve formě souborů Standard Template Library (STL) a 72 tradičních otisků. Modely horního zubního oblouku byly zkonstruovány pomocí 3D tiskárny SLA, využívající fialový laserový paprsek o vlnové délce 405 nm ke ztuhnutí tekutého polymeru. Klasické sádrové odlitky byly připraveny v zubní laboratoři. K vyhodnocení rozdílů mezi zubními modely byl použit laboratorní skener k vytvoření virtuálních odlitků. Výsledky z 22 experimentálních souborů dat ukázaly vysokou míru shody mezi sádrovými odlitky a virtuálními povrchy s průměrným absolutním rozdílem 0,018 mm a směrodatnou...
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3D printing with silver and its use in jewellery
Thomas, Marek ; Langerová, Petra (referee) ; Sučková, Magda (advisor)
Hlavním cílem této práce je najít vhodný typ aditivní tiskárny, která by byla schopna kvalitního 3D tisku stříbrných šperků. Práce seznámí čtenáře s několika typy aditivních tiskáren (FDM, SLA, DMLS a dalších), jejich využitím v praxi a fyzikálním a chemickým chováním stříbra při aditivním tisku. Důraz bude kladen na praktické uplatnění těchto speciálních 3D tiskáren, a to především ve šperkařství. Poslední část práce se pokusí zodpovědět otázku, zda je technicky a ekonomicky proveditelné sestavit a bezpečně provozovat danou 3D tiskárnu v menších firmách či v domácím prostředí.
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VUV spectrometer for vacuum interaction chamber
Drobil, Tomáš ; Šerý, Mojmír (referee) ; Novotný, Jan (advisor)
This thesis deals with the design of a VUV spectrometer for the Laser-induced breakdown spectroscopy (LIBS) method. A prototype using commercially available components was designed and tested. In addition to the actual development of the optical and mechanical design and the selection of the detector, a thorough research of elements emitting in the VUV region was carried out.
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Laser cutting of light and non-ferrous metals
Krucina, Mikuláš ; Kalivoda, Milan (referee) ; Osička, Karel (advisor)
The problem dealt with in this thesis is laser cutting of light and non-ferrous metals. The thesis is divided into research and experimental parts. The research part focused on the analysis of the physical principle of laser cutting, technological possibilities of laser cutting and limitations for individual materials. The experimental part was focused on monitoring the effect of cutting speed, gas pressure and machine power on the surface roughness and dimensional accuracy of the fabricated samples. Two materials were chosen for the experiment. For all samples, a DURMA HD-F 3015BH fibre laser was used for cutting. In the first part of the experiment the influence of selected laser cutting parameters was investigated for samples made of EN AW 5754 material with a thickness of 3 mm. In the second part of the experiment, Cu-ETP material with a thickness of 1 mm was used and the influence of the selected laser cutting parameters was also observed in this case. The last part of this thesis deals with the evaluation of the cutting process from an economical point of view, where the price per meter of cutting and the hourly laser rate for the material were calculated.
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Stability measuring straightness errors in long-term tests
Moravčík, Patrik ; Vetiška, Jan (referee) ; Holub, Michal (advisor)
This thesis is focused on the design and the verification of the automatic correction of the straightness measurement error. Experimentally verified are mechanic gadgets for soft rotation. Several prototypes were created. All of them were tested and evaluated. The whole experiment is evaluated in the conclusion and recommendation for real application was written. In patent research were not any patents relevant to this thesis found, thus we apply our own.
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Engraving with a laser beam
Blabla, Vít ; Fiala, Zdeněk (referee) ; Kalivoda, Milan (advisor)
The aim of the bachelors thesis is to find a suitable method pro product marking and also appropriate conditions. Laser beam engraving was chosen as the most suitable due to its speed, precision and potential for automation. For experimental part of the thesis was selected total of six samples (stainless steel, galvanized steel, aluminium alloy, oak plywood, matte plexiglass and transparent plexiglass). For metal samples engraving was used fiber laser and for non metallic samples was used CO2 laser. On each sample was engraved grid pattern in orderder to compare different materiál groups. In conclusion were chosen the best marking conditions for each sample.
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OTDR optical path analyzer
Šimková, Barbora ; Tomašov, Adrián (referee) ; Dejdar, Petr (advisor)
The aim of this master's thesis was a theoretical analysis of OTDR issues, analysis of OTDR device components, as well as basic parameters of this device. The thesis also includes a theoretical analysis of reflections, scattering, and various types of connectors. In the practical part, a circuit design for OTDR measurement was developed and subsequently implemented. The circuit was realized using the Red Pitaya development board and Koheron laser. Additionally, a circuit for direct method measurement was also created. In the LabView development environment, a program was created, including a graphical user interface. A laboratory task was also designed to provide a basic understanding of OTDR measurement issues.
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Use of laser technology in conditions of job-order manufacture
Popela, Martin ; Slaný, Martin (referee) ; Osička, Karel (advisor)
The thesis is focused on theoretical analysis and physical description of laser beam technology. It deals with possibilities and concrete methods of laser technologies in perspective of metal machining and in detail it describes CO2 laser and its inclusion to the manufacturing process in concrete engineering company. Further it describes the components base and the construction technology of typal representatives. The thesis includes the proposition of solution of increase the productivity of the laser workplace and also technical and economical evaluation of this technology.
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Michelson's interferometer
Rýc, Jan ; Klusáček, Stanislav (referee) ; Havránek, Zdeněk (advisor)
The diploma work deals with techniques of optical contactless distance and velocity measurement. A basic summary of the methods are involved. The problematic of interferometric methods for vibration measurements is analysed in detail. It contains division of interferometers, description of their function principles and also chapters dealing with elements used in interferometers such as lasers, photodetectors and elements in the ray optical way - polarizers, retarders, optical isolators. The vibration and length measurement methods are described, as well as the conception of homodyne and heterodyne detection. Part of this work focuses on the quadrature signal processing and on the proposal of algorithm for demodulation of velocity/displacement and undergoing simple motioning object deviation. This algorithm is implemented in Labview and the whole software instrument served also for visualisation of measured data of the interferometer model constructed in the laboratory. The way how to build up a model, its setting and two possible configurations suitable for homodyne detection are described. Model of interferometer is built-up on the optical breadboard. Particular components are fixed by the help of mounts. The model and software enable to measure the velocity and the vibration deviation with the light wavelength exactness. Functionality and the exactness of the laboratory model are verified by vibrometer. Effects on the measurement uncertainty are discussed here and ways how to restrain them are proposed.
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