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Design of optical fiber sensor for vibration detection
Janoušek, Adam ; Münster, Petr (referee) ; Dejdar, Petr (advisor)
The master theses deals with a detailed analysis of optical fiber sensors. Specifically, there are discussed optical fibers, various types of sensors and realization optical fiber senzor and senzor system that has been optimized and processed data in real time. In master theses also describes the LabView programming enviroment and uses components, including the entire sensor systém of a sensors system that sends measured data
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Optical communication in ultra violet band
Golubev, Martin ; Hudcová, Lucie (referee) ; Poliak, Juraj (advisor)
This bachelor thesis deals with analyzing atmospheric transmission media properties and performance ratio in ultraviolet band optics beam propagating in Earth's atmosphere. In work are definited a optical phenomenons, their implications and use. Description of atmospheric transmission media analyzes the impact of individual particles in the atmosphere on optical beams. There are described a effect of ultraviolet light on living organisms. Simulations of performance ratio using Matlab and proposal of concrete link of UV NLOS for short range are serve as a basis for further research into this field of optical communications.
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Power amplifier for 2 metres radio amateur transmitter
Klapil, Filip ; Vařacha, František (referee) ; Prokeš, Aleš (advisor)
This work deal with development a solution of a power amplifier for 2 metres radio amateur transmitter with a minimum output of 1 kW. Part of the solution is to use a commercial module of power amplifier. In addition, the design of the input attenuator, the switching elements in the signal path, the output filter and the protection circuits including cooling. The bachelor thesis contains a proposal of a system solution with a discussion of required performance and legislative requirements. This is followed by a hardware section, where the work is devoted to the design of the hardware, the theoretical calculation of the components and the simulation. In the last part of the work deals with practical implementation, verification of function and measurement of achieved parameters and their evaluation.
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Mathematical analysis and simulation of optical fiber transmission parameters
Smrž, Jan ; Šporik, Jan (referee) ; Tejkal, Vladimír (advisor)
This thesis deals with the transmission of optical fibers, their properties and method of calculation. The paper presents different types of fiber types and standards. There is a description of the connection of optical fibers with different methods, including variations joints. Further side effects are broken fibers, dispersion and attenuation. The last part is devoted to describing the program, which was part of this work. The program is used to calculate the transmission parameters of optical fibers and optical losses incurred in connection.
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Influence of optical connectors and of other effects on optical link attenuation
Winkler, Aleš ; Křepelka, Václav (referee) ; Filka, Miloslav (advisor)
In this time the metalic wires meet not the requirements of high capacitance and rate wire and so the new, modern fiber wires are more and more being used. This bachelor`s thesis deals with three basic kinds of connections of fiber wires, optical connector, mechanical coupling a optical weld, and their effect on optical link attenuation realized by fiber optics. The optical link is possible realized number of kinds fiber optics. In this thesis are most often used multimod and a little multimod fiber optics. By mechanical coupling are explored their effects of attenuation on optical link a their detrition after disconnection and next connection back to the optical line. For optical weld is explored quality assignet optic welder. For optical connectors is explored their quality of cleanness through apparatus OTDR( Optical Time Domain Reflectometer) and geometrical properties through apparatus FIBO 250.
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Optical fibre factors that limit thetransmission capaity of optical lines
Rouča, Tomáš ; Tejkal, Vladimír (referee) ; Reichert, Pavel (advisor)
Bachelor´s thesis more closely specifies effects of attenuation and dispersion of optical fibers in connection with influencing transmitted signal bandwidth and data transfer capacity. It also examines the influences acting on the optical signal passes through an optical fiber and the mechanism that lead to the attenuation or complete suppression of the signal. The first chapter describes in detail the transmission environment in terms of optical fiber attenuation characteristics of the signal loss caused by rough handling of the optical fiber, manufacturing and material specifications, resulting in scattering or absorption of the transmitted signal. Also, whether the description of fiber dispersion, resulting in the shrinking spectrum of transmitted signal and thus the amount of data at a certain point in time transfer to a defined distance. The second chapter analyzes the effects of attenuation and dispersion in fiber optic transmission capacity currently used in presently optic cables, mechanical couplings, connectors and active components. By mentioning a few examples of real transmission lines with regard to the spectral transmission characteristics that these systems require. This study also includes protocols used to transfer information using xWDM systems. The third chapter deals with modern methods to establish a number of optical signals into a single transmission fiber. Particular attention is devoted to describing the principle of association of the channels in the optical frequencies xWDM, since this method does not currently have a standard solution of information transmission optical fiber for its use significantly more bandwidth, longer distances while maintaining vaulted speed transmission and the possibility of flexible extension without laying new cables and reduce the cost of building transmission lines. The last chapter focuses on describing the implementation of a mathematical model to the spectral characteristics of optical fibers.
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Hydrogel phantoms for ultrasound diagnostics
Cerevatova, Kristina ; Smilek, Jiří (referee) ; Pekař, Miloslav (advisor)
This bachelor thesis deals with properties and preparation of hydrogel phantoms used in ultrasound diagnostics. The main object of this work was to get acquainted with the production and problems of phantom models. The theoretical part of the thesis focuses on phantom characterization, the principle of ultrasound, and phantom manufacturing companies. The practical part focuses on production of phantom models in Dansk Fantom Service, and on own production in the laboratory. Then on these phantoms was studied the speed of ultrasound, attenuation, and other physical changes.
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Ethernet for metallic cables
Víteček, Aleš ; Člupek, Vlastimil (referee) ; Zeman, Václav (advisor)
The bachelor thesis "Ethernet for Metallic Cables" deals with the analysis of Ethernet technology, the most used technology for running computer networks. Specifically, it is focused on transmission via metallic line. The aim of this thesis is description of technology, research of the latest Ethernet standards, including the latest categories of metallic lines. Laboratory tasks and its implementation are described below. This thesis also contains a detailed lab instructions and reference values.
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The Optical Fibre Dispersion Effects on Multiplex Transmission Systems
Kyselák, Martin ; Filka, Miloslav (advisor)
This doctoral thesis deals with present trend to turn up the bit rate of the optical fibres making use of wavelenght multiplex systems. There are new theoretical and practical problems caused by the new technologies. Except the known modal dispersion there exist problems caused by chromatical and polarization mode dispersion. In the opening of the thesis the known effects, which influence the payload signal, are introduced. The polarization mode dispersion has the main attention. Within the scope of this thesis there has been programmed the statistical calculator which can analyses the measured values of differential group delay by Monte Carlo calculation. Next meaningful output is the designating application of the optical routes. It is possible to mathematicaly unambiguously define the polarization mode dispersion by Jones, Stokes and Poynting vectors. This complicated calculations are mechanized and in the simulation application make possible to simulate the signification of the PMD influence at different input parameters. The thesis includes the study of the PMD modulation format impact with the results of simulations and confrontation with other scientists results. The significant output are the final practical results examinations, which can be implemented thanks to the possibility of using the FTB-5500B measuring device.
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