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Characteristics of the atmosphere of Mars for optical communication
Marčák, Tomáš ; Barcík, Peter (referee) ; Hudcová, Lucie (advisor)
The bachelor thesis is focused on the issue and research of atmosphere of the planet Mars for optical communication. The main goal of this thesis was to introduce the transmission through the atmosphere of the Mars and define possible wavelengths which could be used as possible communication. This thesis mainly introduces the optical communication and facts about the atmosphere of the planet. The main chapter presents more detailed analysis of composition of the atmosphere, the impact of the composition that is used for the radiation transmission. Lastly there are presented the results of the calculations and characteristics of the transmission through the Mars atmosphere. The next chapter is focused on theory of optical transmitters and its division. Subsequently, thesis describes the program for calculation of temporal, spatial and energetic characteristics of optical beam.
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Detector of optical beam position
Lukáč, Vladimír ; Barcík, Peter (referee) ; Kolka, Zdeněk (advisor)
The bachelor's thesis deals with the design of an optical beam position detector with the required parameters. The aim was to select a suitable photodetector that captures light rays and converts them into photocurrent, to design photocurrent processing into a voltage signal with linear properties and specified parameters, to convert the analog form of the voltage signal into digital information with which a microcomputer or microcontroller can work. The analog part of the work is simulated in the program OrCAD PSpice, in which the functionality and correctness of the designs is confirmed. The digital part processes the voltage signal to the information of the used channel, its level displays this data on the display.
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High-speed interrogation of sensors with Bragg grating
Lahoda, Vladimír ; Řeřucha,, Šimon (referee) ; Barcík, Peter (advisor)
This diploma thesis deals with high-speed evaluation of Bragg diffraction gratings for sensory purposes. The aim of the project is to design the hardware and software of the electronic unit, which will amplify the analog signal from the photodetectors and distribute all data using a network interface. A programmable gate array is used for data collection and accumulation, which provides control and communication between a single-board computer and an analog-to-digital converter. In addition to the evaluation itself, other functions are included, such as excitation and stabilization of the optical power of the laser diode, or temperature stabilization of critical components. The proposed concept is experimentally verified on mounted printed circuit boards.
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Prediction of the atmospheric turbulence
Sloboda, Šimon ; Barcík, Peter (referee) ; Hudcová, Lucie (advisor)
The aim of this work is to examine theoretical knowledge of the refractive index structure parameter and models for its calculation and prediction. Based on data downloaded from meteorological services, the accuracy of refractive index structure parameter prediction using Sadot-Kopeika model was evaluated at ten different locations on Earth. A program was created for the calculation and prediction of the refractive index structure parameter, which uses downloaded meteorological data.
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Direct conversion RF Front-end transceiver module for 5G-NR in sub-6GHz band
Kaleta, Lukáš ; Barcík, Peter (referee) ; Waldecker, Miroslav (advisor)
Thesis describes in a several steps dign of a front-end module for SDR transceiver to be used for communication in the sub-6GHz bad of the 5G network. Module uses an homodyne frequency mixing and is capable of 2x2 MIMO comunication. Desigh includes the block diagram layout, choosing the right components and parametr simulations of the module. Furthermore, the work continues with the design of the schematic, PCB, implementation and testing of the module. Slight description of the 5G NR network, direct conversion, digital signal modulation and connection performance i salso part of this document.
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Interface for optical pulse detector
Dušek, Filip ; Barcík, Peter (referee) ; Kolka, Zdeněk (advisor)
This bachelor thesis deals with the design, realization, and testing of the interface for the optical pulses detector. The interface consists of 3 parts – the photodetector, the preamplifier, the adjustable source. Supply source for avalanche photodiode includes experimental function for voltage automatic setting with the help of gain measurement. Photodetector is complemented by a wideband amplifier with gain 19dB.
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Prediction of the atmospheric turbulence
Sloboda, Šimon ; Barcík, Peter (referee) ; Hudcová, Lucie (advisor)
The aim of this work is to examine theoretical knowledge of the refractive index structure parameter and models for its calculation and prediction. Based on data downloaded from meteorological services, the accuracy of refractive index structure parameter prediction using Sadot-Kopeika model was evaluated at ten different locations on Earth. A program was created for the calculation and prediction of the refractive index structure parameter, which uses downloaded meteorological data.
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Transmission of the radiofrequency signal over optical fiber
Barč, Andrej ; Dvořák,, Filip (referee) ; Barcík, Peter (advisor)
This work deals with the transmission of optical radiation modulated by a radio frequency signal through an optical fiber. Furthermore, it describes the principles of communication and area coverage. It points out the practical use of components located in the communication chain of this system. Explains the functionality of the properties and the division of individual components. It introduces the benefits and limitations of this system. It further describes the creation of a topology suitable for laboratory measurement of RoF technology. Provides experimental measurement of C-band parameters. Indicates the possible use of RoF technology using a wireless optical link. A part of the work is also a sample laboratory protocol.
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Amplifier for semiconductor photomultiplier
Vomela, Roman ; Barcík, Peter (referee) ; Kolka, Zdeněk (advisor)
This bachelor thesis deals with design of an amplifier for semiconductor photomultiplier. A semiconductor photomultiplier combines tens to hundreds of avalanche photodiodes into a matrix capable of detecting incident photons. The output of the photomultiplier are pulses with an amplitude of about 1 mV whose mean frequency corresponds to the incidence optical power. Based on the analysis of the experimentally obtained output signal, three solutions were proposed: an amplifier with operational amplifiers, a variable gain amplifier and a monolithic amplifier circuit. These three solutions were compared in terms of bandwidth, noise and power consumption, and a variant with operational amplifiers was chosen for implementation. To verify the properties of the amplifier, an auxiliary printed circuit board with a power supply circuit was implemented.
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Position sensing detector
Ha, Tuan ; Wilfert, Otakar (referee) ; Barcík, Peter (advisor)
This thesis deals with design of a laser position detector. Different types of sensor are mentioned and compared at the beginning. Special attention is paid to quadrant sensor. Its pros and cons are discussed with designing methods. The sensor is simulated in Matlab to test its output response. Then the laboratory tests follow to meassure real response of the chip. Then follows the design of the detector based on measured and simulated data. In the conclusion of this thesis parameters of created device are evaluated.
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