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Depth profiling using laser-induced breakdown spectroscopy method
Průcha, Lukáš ; Novotný,, Karel (referee) ; Pořízka, Pavel (advisor)
The diploma thesis deals with the use of Laser-Induced Breakdown Spectroscopy (LIBS) for depth profiling and 3D mapping of the zinc-coated steel used in the automotive industry. Before creating depth maps and depth profiles, optimization of the experiment was performed. It was shown that the LIBS technique is suited for making depth profiles and depth maps. The theoretical part deals with the description of the LIBS instrumentation, characteristics of plasma, and assembling of scientific papers which reflect the up to date knowledge about depth profiling and mapping with the use of the LIBS technique. The experimental part describes the optimization of the experiment. Gate delay, the depth and the diameter of craters using the profilometer, the position of the focal plane relative to the sample surface, and selection of spectral lines with the smallest residual signal and small scattering of data were optimized. Depth profiles of zinc, iron, chromium and manganese with the depth map of zinc and iron were made, and also the depth resolution for both elements was calculated.
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Automatization of method of surface structure measurement by means of reflection mode digital holographic microscope.
Vacula, Daniel ; Šerý, Mojmír (referee) ; Lovicar, Luděk (advisor)
Reflected-light digital holographic microscope developed at IPE FME BUT uses off-axis holography principle and low spatial and temporal coherence illumination. Microscope allows reconstruction of the image amplitude and the image phase, which can be handled in real time. The only limiting factors are imaging speed of the detector and computer performance when processing holograms. Reconstruction of image phase and amplitude allows high-resolution profilometric measurements in the vertical axis direction. This thesis deals with the automatization of profilometric measurement method proposed in [2]. Proposed method uses the combination of the image phase and the image amplitude for the measurement of specimens with surface structure the vertical size of which cause the uncertainty of the image phase by a factor of 2pí. Futher the thesis deals with the construction design of the illumination system of the microscope and its realization together with experimental verification of functionality of proposed method automatization.
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Optical properties of protective emulsions
Valasová, Denisa ; Veselý, Michal (referee) ; Zmeškal, Oldřich (advisor)
This bachelor´s thesis is aimed to the study of optical properties of protective commercially available emulsions. Chosen emulsions should be responsible for sun protection. They also may be used in cosmetic industry. In the beginning of the thesis, there are defined theoretical features of emulsions and their interaction with UV radiation. Methods which are used to describe optical properties could be found in this section too. The optical properties were measured in thin layer films, in order to simulate emulsions applied on the human skin. UV-VIS spectrophotometry was mainly used to study the optical properties. The obtained results could serve, purely hypothetically, like sun protective tests of chosen emulsions.
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Experimental evaluation of aluminothermic welds
Zeman, L. ; Valach, J. ; Zlámal, P. ; Krčmářová, N. ; Koudelková, Veronika ; Zeman, J.
The article presents a study of the mechanical processes occurring during the aluminother-mic reaction using experimental methods (strain gauges, digital image correlation, thermography,scanning electron microscopy, profilometry). The aluminothermic reaction is a highly efficient weldingmethod due to its exothermic behaviour, however, it places considerable demands not only on thewelding technique, but also on the capabilities of the experimental methods used - these limitationsare also discussed in the article. The aluminothermic reaction is associated with the formation of alocalised heat source with a time evolution dictated by the technological procedure, which manifestsitself in heat propagation to the surrounding weld material. The unequal evolution of the temperaturefield is the fundamental cause of the appearance of the heat affected zone or local deformations orsurface curvature, which was the focus of the experimental methods deployed above and the results ofwhich are shown in the article.
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Probe for Determining the Surface Condition of Small Diameter Barrels
Procházka, Adam ; Goldmann, Tomáš (referee) ; Malaník, Petr (advisor)
This thesis focuses on the analysis of methods for measuring surface profiles, as well as the design and implementation of a device for their measurement. The implemented device utilizes non-contact triangulation profilometry techniques to determine the surface profile by projecting a laser line onto the surface and capturing the projected shape at a non-zero observation angle. It alse collects information about the surface’s image texture under LED illumination. In addition to data on image texture and profile, data on the position of the captured images is also collected using a sensor measuring the device’s distance from the end of the barrel. The work also includes the design and implementation of custom control modules for the chosen LED and laser diode. The output from the device is presented in a user application. The device is designed to function in tubes with diameters from 40 millimeters.
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Fabrication of conducting patterns by material electroless plating of printed precursor
Kováčová, Silvia ; Gemeiner,, Pavol (referee) ; Dzik, Petr (advisor)
The subject of this diploma thesis is the preparation of conductive structures by electroless plating of an extruded precursor. The experimental part deals with the preparation of standard patterns based on the length of immersion time in a coppering bath. The precursor layers were applied with Fujifilm Dimatix to various receiver substrates. The individual substrates with the precursor layer were immersed in the copper solution within different time intervals. The structure of the layers of grown copper and their thickness was characterized by a profilometer.
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Study of optical properties of thin films of perovskiteFAPbBr3 precursors
Smolková, Denisa ; Čech, Vladimír (referee) ; Zmeškal, Oldřich (advisor)
This thesis examines the preparation of thin layers of material for photovoltaic applications with focused on perovskites and determining their optical properties. Basic information about the photovoltaic panels, especially about the perovskites, and the preparation of thin layers is supplied in the theoretical section. This section includes description of optical properties and the main method of study of optical properties, spectroscopic ellipsometry. Experimental section is focused on the preparation of thin layers of perovskites FAPbBr3 and its precursors by spin-coating. Optical properties are evaluated using profilometry, UV VIS spectrometry and spectroscopic ellipsometry. The conclusion summarizes the results of this experiment with focused on comparison of ellipsometric spectrums of perovskites and its precursors.
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Advanced materials for organic bioelectronics
Sedlák, Jiří ; Salyk, Ota (referee) ; Weiter, Martin (advisor)
This bachelor thesis deals with the research of PEDOT:DBSA material for possible use in organic bioelectronics. First, a method for preparing PEDOT:DBSA layers of required thickness was standardized and the dependence of the thickness on the conductivity of the material was monitored. Subsequently, the effect of thermal stabilization and EG, DMSO and H2SO4 substances on the conductivity of prepared layers was tested. Two principles were tested to increase conductivity. The first was the principle of adding substances as dopands into liquid polymeric solutions. The second method of sample preparation was the method of secondary treatment of already prepared layers of pure PEDOT:DBSA. All of prepared polymeric layers were characterize by two methods: four point probe and profilometry.
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Roughness Measurement With Laser Profilometry
Mach, Radoslav
The project deals with technology of laser profilometry for material roughness measurements purposes. The focus of this work is measuring roughness parameters of materials, such as metal with using of different types of laser emmited light. Results demonstrate correlation between the wavelengths of the used laser lights with measurement accurancy.
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Study of the optical properties of graphene oxide thin films
Smolková, Denisa ; Zmeškal, Oldřich (referee) ; Schmiedová, Veronika (advisor)
This thesis examines the preparation of thin layers and determining their optical properties. It is focused on graphene oxide. In the theoretical part, basic information about the thin layers and their preparation is supplied. That is followed by a description of various methods of determining their optical properties and properties of light. Experimental part and results are focused on the preparation of thin layers by spin-coating and evaluation of measured values using optical microscopy, profilometry, spectroscopic ellipsometry and UV VIS spectroscopy. The conclusion summarizes the results of these methods.
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