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Polarization in optical fiber
Bilek, Maroš ; Dejdar, Petr (referee) ; Münster, Petr (advisor)
In the theoretical part of the the bachelor's thesis, the first part is devoted to the analysis of the spread of the light beam in the fiber, the parameters of light and various types of fibers. Subsequently, the phenomenon of polarization, its conditions, methods of depiction and writing are described in detail. Furthermore, the issue of polarization mode dispersion (PMD) is explained. Bindings, differential group delay and PMD measurement methods are described. The practical section of the thesis describes the methods and procedures for measuring polarization and polarization mode dispersion. The EXFO FTB-200 measuring platform was used to measure PMD and was equipped with a module for PMD/CD measurement. A polarimeter in combination with a polarization analyzer was used to measure polarization. As part of the long-term measurements, the EXFO FTB-200 measuring instrument was reused in the case of PMD. In the case of polarization measurements, a combination of polarimeter and balance detector was used. Finally, the results of both short- and long-term measurements are displayed. The results of short-term polarization measurements are shown in the form of both, a Poincaré sphere and a polarizing ellipse with a calculated azimuth and ellipticity. Long-term measurements are in the form of graphs that show changes in polarization rotation rate over time. From the displayed results, the dependency of polarization and therefore PMD on the environmental surroundings is concluded.
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Car computer based on Raspberry Pi
Matula, Vladimír ; Dejdar, Petr (referee) ; Münster, Petr (advisor)
The main goal of this diploma thesis is to investigate the smart cars field together with the technologies linked closely to it. Further, the thesis offers an overview of options to extend the vehicle capabilities with the car computer created with the Raspberry Pi Zero W. The thesis provides hands-on experience and is stuctured into two parts. The first, theoretical section focuses on Internet of Things and Machine to Machine communication. It also describes the currently available smart car solutions on the market, their pros and cons. The practical part of this thesis describes design and creation of a smart computer based on Raspberry Pi Zero W with draft of self-made security system from vehicle containing a motion sensor and a camera. It also includes a development and integration steps with a mobile application capable of viewing the static information regarding the car state, such as Rotations per minute. Vehicle speed, etc. The created system also has the capability of informing the user about it's current location on request.
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Optical fiber as a distributed temperature sensor
Vošček, Jakub ; Dejdar, Petr (referee) ; Münster, Petr (advisor)
The financial requirements between fiber optic sensors and conventional sensors are gradually declining, which, despite many advatages and wide range of applicationas, has slowed down the demand for these sensors. With the demand for fiber optic sensors also grow the requirements for the parameters of these sensors. This thesis deals with distributed temperature fiber optic sensors. Non--linear phenomen in optical fibers, such as Raman scattering is used for measuring with these sensors. This scatterin was used to obtain information about temperature, which effected the optical cable under the test.
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Communication between control units in the automotive industry
Jurek, Martin ; Tomašov, Adrián (referee) ; Dejdar, Petr (advisor)
The topic of this bachelor thesis is communication between control units of door systems in public transport. Firstly, the regulations that a communication system must comply with are described to be used in public transport. Furthermore, systems for communication via optical fiber, metallic lines and wirelessly using Bluetooth Low Energy are designed. The technologies used are theoretically described and the designed systems are implemented using the development board Lolin 32 ESP-WROOM-32 and Arduino Uno. The systems are designed to capture inputs from a driver or passengers that are then shown on a display. The created transmission systems are described in more detail in the thesis.
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Laboratory exercise - OTDR optical path analyzer
Šimková, Barbora ; Münster, Petr (referee) ; Dejdar, Petr (advisor)
The bachelor's thesis consists of detailed analysis of OTDR problematics and implementation of the connection. Part of the work also consists of theoretical analysis of optical fibers and their transmission properties, especially dispersion and diffraction. Realization of the connection was made using platform Red Pitaya and laserboard Koheron. Final program was created in development environment LabView. The program also contains graphical user interface.
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Implementation of SCADA architecture into fiber optic seNSING systems
Šišolák, Filip ; Tomašov, Adrián (referee) ; Dejdar, Petr (advisor)
The bachelor thesis deals with the issue of data control and acquisition using SCADA technology and the subsequent implementation of two-way communication. The theoretical examination also includes an analysis of the current state of use of SCADA in optical sensing systems. In view of the shortcomings of the available SCADA systems, our own software programmed in the LabVIEW development environment is implemented. The Modbus TCP protocol is used for communication with the myRIO platform. Part of the work is also the analysis of the maximum achievable throughput with the Modbus TCP protocol.
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Applications of optical fibre sensors
Ráboňová, Jana ; Dejdar, Petr (referee) ; Münster, Petr (advisor)
This master's thesis deals with the measurement of soil temperature. In the theoretical part, optical fiber systems were explained, with a focus on DSTS systems and their use. In the practical part, a functional system was created to measure the soil temperature at depths of 0.1-1~m using the Arduino platform. Furthermore, the temperature measurement was demonstrated on the test polygon using the optical fiber of the FTB 2505 instrument in laboratories.
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Laboratory task for measuring parameters of optical fibre gratings
Dúbravka, Adrián ; Dejdar, Petr (referee) ; Ružička, Michal (advisor)
The bachelor’s thesis deals with optical fibers, especially fiber gratings such as Bragg’s grating. The theoretical part describes different types of fiber grids and their main differences. Later on the theoretical part deals with different methods of manufacturing Bragg’s gratings, temperature compensation in grantings and their use as a sensor. The practical part deals with the influence of pressure and temperature on gratings and sliding FBG sensor. OSNR and spectral lattice widths are also measured. Furthemore, the influence of various types of strain on optical fibers in Bragg’s gratings is also studied.
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Creation of Bluetooth data logger for recording and processing of measured data
Vaverka, Jan ; Myška, Vojtěch (referee) ; Dejdar, Petr (advisor)
The first part of the theses deals with dataloggers and their use in today's world. The second part is dedicated to microcontrollers which are used as a control unit for dataloggers. Individual peripheral devices MCU and their communication interfaces have been described. The next part deals with Bluetooth Low Energy which is used for data broadcasting to the user. Based on the acquired knowledge the microcontroller and sensors were selected. A datalogger was constructed and programmed from selected components, which will measure the properties of ferment during fruit fermentation. Finally, a mobile application was created to download data from the datalogger and then display the data in charts.
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