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Design of an engraving LED laser
Kasík, Martin ; Sliwková, Petra (referee) ; Dvořáková, Jana (advisor)
This thesis is focused on the search of unconventional machining methods, especially on the technology of laser beam machining. It deals with the area of laser cutting and engraving and examines the influence of individual technological parameters on the given process. Furthermore, there is proposal of design of hobby LED engraving machine, its supporting structure, HW and other electronic components. The prototype of the device is physically assembled and its functionality is verified in the form of several engraving tests of raster and vector formats of graphic materials, and some several shape cuts are made also. The technical evaluation of the assembled equipment, evaluation of tests performed and cost calculation is part of the work too.
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Laser cleaning of technical materials
Čermák, Filip ; Joska, Zdeněk (referee) ; Sedlák, Josef (advisor)
This thesis deals with the issue of the effect of laser cleaning on the surface of the base material, respectively on its surface texture. The theoretical part of the thesis is focused on the characteristics of laser technologies, an overview of surface cleaning methods in the field of mechanical engineering and the introduction of the company ŽLUTÉ LASERY s.r.o., that helped to create and process the assigned topic. In the practical part focused on the experiment is discussed the choice of materials, production of samples, selection of types of impurities and their application to designated areas. The main part is a description of the laser cleaning process, roughness measurement and statistical evaluation of the investigated surface roughness parameters (Ra, Rz, Rp, Rv, RSm, RPc, Sa, Sz, Sp, Sv, Spd and Spc). In the end, the processed results are evaluated and presented.
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Active stereo vision
Doležal, Milan ; Richter, Miloslav (referee) ; Janáková, Ilona (advisor)
This thesis deals with active stereo method for measurement of objects with transparent layer. In theoretical part of this thesis is described method of active triangulation and method of active stereo. After that, there is research of articles focused on transparent layer in optical measurement. Next chapters deal proposition of measuring system, it's parameters, calibration, procedure and evaluation of measurement. MATLAB was selected as programming platform.
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Physics of medical devices
Čečák, Michal ; Lustigová, Zdena (advisor) ; Rotter, Miloš (referee)
My bachelor thesis deals with medical devices. Specially operates with four instruments, that people are familiar with them. The text is designed for teachers at primary and secondary school. Thesis includes also three worksheets. At the end of each are also links to website that we could find some new information about issues studies.
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Selection of femtosecond laser pulses
Bažíková, Sára ; Trojánek, František (advisor) ; Zázvorka, Jakub (referee)
Construction of the laser is one of the most important physical advances of modern times. Its use in practice is extremely common and desirable, therefore, it is necessary to push the boundaries of possibilities of this technique still further. Lasers generating ultrashort pulses are widely used in material research for the study of nonlinear effects and ultrafast processes. These lasers have a high repetition rate, which must be reduced for some applications. In this thesis we used femtosecond titanium -sapphire laser from Spectra Physics, whose repetition rate is 80 MHz. The aim of this thesis is to reduce this frequency by using a pulse selector. The key mechanism that utilizes the pulse selector is an acoustooptic modulator that is based on the principle of Bragg diffraction and it is able to select pulses with a frequency of 1 Hz-4 MHz. The end of thesis is measurement of the properties of this selector and its optimization.
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Laser absorption spectroscopy
Vyhlídka, Štěpán ; Plašil, Radek (advisor) ; Hrubý, Vojtěch (referee)
Study of recombination of molecular ionts in cold plasma plays a key role in our understanding of chemical kinetics in interstellar space or in upper layers of planetar atmospheres. Various metods are used for its study of which important part is laser absorption spectroscopy. Concentration or temperature of measured ionts can be found from their absorption spectra. In the presented work two spectroscopic techniques are briefly introduced - Cavity ringdown spectroscopy and Laser induced reaction technique. Main me- chanisms for spectral linewidth broadening are described and from absorption spectra of H+ 3 and N+ 2 ionts measured by above-mentioned techniques their kine- tic temperature is discovered. Because it is affected by spectral width of applied laser diodes, a part of this work also deals with description of its measurement by self-heterodyne method or Fabry-Pérot interferometer. The spectral width is found for infrared diode DFB laser. 1
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Investigation of parameters of ultrafast laser pulses
Chlouba, Tomáš ; Němec, Petr (advisor) ; Preclíková, Jana (referee)
In this work we investigate parameters of laser radiation coming from continual titan-sapphire laser 3900S, pulsed titan-sapphire laser Mai-Tai HP and from optical parametric oscillator Inspire made by Spectra Physics. We are particulary insterested in dependence of power, width of the beam, noise and beam pointing stability as a function of wavelength. We have also measured beam pointing stability in time and compared it with beam stability during change of wavelength. With pulse laser we are also interested in the spectra and time width of the pulses. We aim to compare the properties of both titan-sapphire lasers and to verify specifications of Mai-Tai and Inspire given by the manufacturer.
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Laser Beam Detection and Localization in the External Environment
Horňanská, Lucie ; Baláž, Teodor (referee) ; Drahanský, Martin (advisor)
This bachelor thesis aims on the method of laser beam detection and localization in the external environment. The theoretic part focuses on the basic principle of laser operation, its types, legislation that regulates them, beam optics, types of cameras with the possibility of using photographic filters, image processing and object detection methods in the image. The practical part presents the process of creating a database of images and describes the design and implementation of an algorithm for detecting the laser, its target point or source in the image and subsequent localization in a three-dimensional coordinate system. Finally, the achieved results of the created program are evaluated and the possibilities for improvement are presented.
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