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Surface hardening of cast iron by high power diode laser
Bezděk, Pavel ; Daněk, Ladislav (referee) ; Mrňa, Libor (advisor)
The Master’s thesis deals with the technology of surface hardening by laser. High power diode laser is used for this purpose. Surface hardening is performed on cast iron BS 1452-77, at different speeds laser head and laser power. In introduction, the theoretical part deals with possible ways of hardening focusing on the benefits of laser hardening. There are mentioned basic parts of laser, type industrial lasers and their application in industry. The final part is mentions the using of material and methods used to evaluate samples. The practical part describes the using devices and carries out evaluation macrostructure and microstructure and evaluation of hardness depending on the distance from the surface.
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Power-Over-Fiber power supply
Kos, David ; Vlček, Čestmír (referee) ; Drexler, Petr (advisor)
This thesis deals with the possibilities of energy transmission by optical fiber for the purpose of powering of electronic systems. It comprises issues of electrical energy conversion to optical energy, coupling the power into the optical fiber, coupling between fiber and opto-electric transducer, conversion of optical energy to electrical energy, and transformation on required voltage levels. The principles of such Power-Over-Fiber are discussed in the first part of the work. Various technologies for the implementation of key system parts and their effectivity are discussed. In the next part, several Power-Over-Fiber commercial devices are compared. Subsequently, systems for Power-Over-Fiber experimental implementations are proposed. They are based on the utilization of semiconductor laser, multimode fiber, photovoltaic cell and related electronic circuits. The final part of the thesis deals with the construction of experimental systems and measurement of parameters of transmitted power and efficiency.
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Semiconductor laser driver for 1Gbit/s
Chlachula, Filip ; Křivák, Petr (referee) ; Prokeš, Aleš (advisor)
This master´s thesis deals with a solution of the driving circuits of semiconductor laser. In the beginning of the thesis there is an analysis of semiconductor lasers and its characteristics. Then the principle of laser diodes and its excitation is described. This thesis is focused on semiconductor laser excitation through the use of direct and modulating current. Several circuits are described, designed and simulated. The best resulting circuit is realized and measured in the laboratory.
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Welding of aluminum alloys using high-power semiconductor laser
Mikeš, David ; Kubíček, Jaroslav (referee) ; Mrňa, Libor (advisor)
Thesis deals with the optimization of process parameters during laser welding of aluminum alloys 5000 series. The theoretical part describes the types of lasers and their applications in industry, further discusses the properties of aluminum alloys, laser welding theory and principles of monitoring and diagnostics of laser process. In the experimental part the samples were welded using a semiconductor laser. For those samples were evaluated mechanical properties, welded defects and structure depending on the process parameters. Using the photodetector was observed stability of laser process by sensing the plasma plume. The link between stability and the formation of structural defects in the weld joint was observed from the measurement results.
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Laser source with fiber-optic output
Roupec, Tomáš ; Mikulka, Jan (referee) ; Drexler, Petr (advisor)
This term project deals with the semiconductor laser components, and how it works. Additionally, there is an optical fiber ant networking with laser. It is written of power and cooling laser diodes and such information suggested the possible involvement of the laser diode. At the end of this work is designed laser´s exciter with charging and adjacent circuits.
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Laser source with fiber-optic output
Roupec, Tomáš ; Mikulka, Jan (referee) ; Drexler, Petr (advisor)
This term project deals with the semiconductor laser components, and how it works. Additionally, there is an optical fiber ant networking with laser. It is written of power and cooling laser diodes and such information suggested the possible involvement of the laser diode. At the end of this work is designed laser´s exciter with charging and adjacent circuits.
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Laser source with fiber-optic output
Roupec, Tomáš ; Mikulka, Jan (referee) ; Drexler, Petr (advisor)
This term project deals with the semiconductor laser components, and how it works. Additionally, there is an optical fiber ant networking with laser. It is written of power and cooling laser diodes and such information suggested the possible involvement of the laser diode. At the end of this work is designed laser´s exciter with charging and adjacent circuits.
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Laser source with fiber-optic output
Roupec, Tomáš ; Mikulka, Jan (referee) ; Drexler, Petr (advisor)
This term project deals with the semiconductor laser components, and how it works. Additionally, there is an optical fiber ant networking with laser. It is written of power and cooling laser diodes and such information suggested the possible involvement of the laser diode. At the end of this work is designed laser´s exciter with charging and adjacent circuits.
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Power-Over-Fiber power supply
Kos, David ; Vlček, Čestmír (referee) ; Drexler, Petr (advisor)
This thesis deals with the possibilities of energy transmission by optical fiber for the purpose of powering of electronic systems. It comprises issues of electrical energy conversion to optical energy, coupling the power into the optical fiber, coupling between fiber and opto-electric transducer, conversion of optical energy to electrical energy, and transformation on required voltage levels. The principles of such Power-Over-Fiber are discussed in the first part of the work. Various technologies for the implementation of key system parts and their effectivity are discussed. In the next part, several Power-Over-Fiber commercial devices are compared. Subsequently, systems for Power-Over-Fiber experimental implementations are proposed. They are based on the utilization of semiconductor laser, multimode fiber, photovoltaic cell and related electronic circuits. The final part of the thesis deals with the construction of experimental systems and measurement of parameters of transmitted power and efficiency.
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Surface hardening of cast iron by high power diode laser
Bezděk, Pavel ; Daněk, Ladislav (referee) ; Mrňa, Libor (advisor)
The Master’s thesis deals with the technology of surface hardening by laser. High power diode laser is used for this purpose. Surface hardening is performed on cast iron BS 1452-77, at different speeds laser head and laser power. In introduction, the theoretical part deals with possible ways of hardening focusing on the benefits of laser hardening. There are mentioned basic parts of laser, type industrial lasers and their application in industry. The final part is mentions the using of material and methods used to evaluate samples. The practical part describes the using devices and carries out evaluation macrostructure and microstructure and evaluation of hardness depending on the distance from the surface.
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