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A laser beam in engineering
Šustr, Michal ; Kalivoda, Milan (referee) ; Osička, Karel (advisor)
The bachelor thesis focuses on the use of laser beam in the conditions of contemporary engineering, especially in cutting. Emphasis is put on the current technological possibilities of laser in industry, which are described in more detail. Cutting, welding, marking, surface cleaning and hardening, 3D metal printing and surfacing, all using laser beam, is mentioned in the bachelor thesis. The conclusion of the thesis is devoted to the productivity of work with the capacity of the laser together with the balance of operating and maintenance costs.
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Digitalization of the optical intensity distribution scanning
Škrob, Robin ; Hudcová, Lucie (referee) ; Křivák, Petr (advisor)
This Master’s thesis solves a design and construction of device for gathering and transfer of data into computer. The device should replace graph plotter, by which is measured the optical intensity of a laser beam. From this characteristic it is possible to determine other parameters of the laser beam, such as halfwidth of the beam, angle of divergence and Rayleigh length. The described device - “data gatherer” - measures two voltage values – voltage detected on photodiode and voltage detected on distance moved by photodiode. Measured values of voltage are processed and sent through a serial line into the computer. A pre-amplifier is connected to the control part for both channels of measured values with possibility of amplification. Computer application, which performs graphic interpretation of the measured values, serves as user control peripheral. The product of this project is compact device operating under OS Windows with graphic output.
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Unstability cut of laser beam at dividing limiting gauge thickness
Kadlec, Zdeněk ; Kalivoda, Milan (referee) ; Osička, Karel (advisor)
This thesis deals with the possibilities of cutting strong steel metal sheets by means of laser and problems rising from the incision, their technological investigation. The basic philosophy consists on the research of the interaction between laser bunch and material, depending on the position of focal poin and sequential results in spec. heat. It determines the main parametres of the incision (from the total quantities and matematical description) which have the biggest effect on the occurence of wide cut and perhaps even on the quality of products and consequential optimalization of these quantities.
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Rotary flash hardening with help of electron beam and laser radiation
Klusáček, Martin ; Jan, Vít (referee) ; Kouřil, Miloslav (advisor)
This master thesis deals with surface hardening of steels, especially with rotary flash hardening of 42CrMo4 steel (WNr 1.3563, ČSN 15142). In this method homogenous heating of whole surface occurs during a very fast rotation of the component. In the theoretical part of this thesis the most common methods of surface hardening are described, with focus on laser and electron beam technologies. In the experimental part special device for this application was constructed. Rotary flash hardening was done using different radiation source and experimantal device parameters. The hardened surface layer of maximal thickness of 0,7 mm and width of 5,6 mm was achieved using laser beam. Results with electron beam were way better, because this technology allows to control the distribution of power along the beam width in order to improve the width/thickness ratio of hardened layer. Using this method maximal layer thickness of 1,4 mm and width of 13,4 mm was achieved.
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Influence of atmospheric turbulences on laser beam intensity profile
Císař, David ; Wilfert, Otakar (referee) ; Hudcová, Lucie (advisor)
Free space optical communications provide a reliable alternative to microwave and cable system applications. This technology is utilized for an optical links between ground stations, and moreover for links between High Altitude Platforms (HAPs). The main goal of the project is to gather knowledge about degradation of an optical beam in the atmosphere. The optical beam is being exposed to many factors such as intensity fluctuation based on turbulence, attenuation due to absorption and scattering. Furthermore, an emergence and influence of the atmospheric turbulences on the intensity profile of the laser beam are discussed. At the end, the methods of atmospheric turbulence measurement are given.
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A small and medium companies approach to the use of laser machines
Faltus, Tomáš ; Osička, Karel (referee) ; Kalivoda, Milan (advisor)
This bachelor thesis focuses on laser technology. It presents the principle and types of lasers and the use of lasers in the industry. The process of cutting, welding, marking, drilling, and other operations that can be performed on the laser, are also discussed. The following part of the thesis defines a small and medium-sized company, and for each of them is given one situation from practice. For the small and medium-sized companies, their machinery and product range is listed. At the end of the bachelor's thesis, two examples of the production process are included and then further compared with each other. In the first case, it is a more complex part produced only by laser, and in the second instance, it is a simpler part produced by more machines.
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Automated measurement of polarisation properties of an optical beam
Březina, Vojtěch ; Vlček, Čestmír (referee) ; Poliak, Juraj (advisor)
Diploma thesis deals with polarization properties of an optical beam and the determination of its polarization state by means of the proposed automatic measurement method. Furthermore the influence of an environment on the polarization state of the optical wave is studied. At the beginning of this thesis the fundamental terms with respect to the wave polarization including the description of the polarization devices are presented. In conclusion a method for an automated experimental workplace for the measurement of the polarization properties using Poincare sphere and Stokes parameters is designed and verified.
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A small and medium companies approach to the use of laser machines
Faltus, Tomáš ; Osička, Karel (referee) ; Kalivoda, Milan (advisor)
This bachelor thesis focuses on laser technology. It presents the principle and types of lasers and the use of lasers in the industry. The process of cutting, welding, marking, drilling, and other operations that can be performed on the laser, are also discussed. The following part of the thesis defines a small and medium-sized company, and for each of them is given one situation from practice. For the small and medium-sized companies, their machinery and product range is listed. At the end of the bachelor's thesis, two examples of the production process are included and then further compared with each other. In the first case, it is a more complex part produced only by laser, and in the second instance, it is a simpler part produced by more machines.
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A laser beam in engineering
Šustr, Michal ; Kalivoda, Milan (referee) ; Osička, Karel (advisor)
The bachelor thesis focuses on the use of laser beam in the conditions of contemporary engineering, especially in cutting. Emphasis is put on the current technological possibilities of laser in industry, which are described in more detail. Cutting, welding, marking, surface cleaning and hardening, 3D metal printing and surfacing, all using laser beam, is mentioned in the bachelor thesis. The conclusion of the thesis is devoted to the productivity of work with the capacity of the laser together with the balance of operating and maintenance costs.
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CNC Applications for Laser Cutting
Hruška, Daniel ; Žák, Ladislav (referee) ; Řiháček, Jan (advisor)
The following thesis deals with the theory of laser. In the first part, the thesis is focused on the issue of laser cutting (laser principle, cutting methods, laser division). Furthermore, the thesis is focused on basic theory of automation and NC/CNC control of machines. In the experimental part, the BUT logo was burned out with CO2 laser with the help of the company UnionOcel s. r. o.
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