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Led matrix 8x64
Marek, Michal ; Macháň, Ladislav (referee) ; Šteffan, Pavel (advisor)
The bachelor thesis describes what is a LED matrix and how to control them. The function of the control circuits for the LED matrixes, the function of the current controller and microcontroller programming method are delineates in the project. These include microcontroller programming via universal serial bus, changing source code parameters via local ethernet network with the ethernet connect module, using standard peripheral buses for serial transmissions and the ways of controlling LEDs using relevant libraries. Objective is to introduce a solution for LED controlling using the Windows software application and propose complex assembly includes all the necessary blocks, which provides simple operating for new users.
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Wireless optical link
Haňka, Jiří ; Hudcová, Lucie (referee) ; Poliak, Juraj (advisor)
This thesis is aimed at section of transmission of digital data by using two optical wireless communications realized by two free-space optics transcievers working in full-duplex mode. Generally, the work describes present options of optical connections, their principles and comparison with other connections. Basic components of realized transmitter and receiver are mentioned with their characteristics and wirings. The work describes options of transmission and further deals with various external events, which influence characteristics of transmitted optical signal. Thesis describes the optical part of design and construction free-space optic and it’s ending energy balance of this link. Further, the work treats of basic use of ethernet technology in transmissions, coding and modulations of data transmitted by optical connection.
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Calibration of Digital Camera to Luminance Measurement
Volek, Martin ; Závada, Petr (referee) ; Baxant, Petr (advisor)
The thesis deals with the calibration of a digital camera for a purpose of luminance measurement. The aim is to create calibration approximation functions allowing the calculation of luminance. The first part analyses the basic light-technical parameters, as well as the principle of luminance measurement and the features of digital cameras for this purpose. An important issue, introduced in the present thesis, is to adapt a digital camera as a luminance meter. Furthermore, there is a description of the preparation of a site for the calibration, including necessary devices. The last part is dedicated to define the acquired calibration functions for the respective light sources and their mutual comparison.
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Study of the thermal and light conditions in the automobile headlamp with built-in light source of the new generation
Zachar, Martin ; Černý,, Pavel (referee) ; Černý, Pavel (referee) ; Raudenský, Miroslav (advisor)
This thesis deals with automotive headlamps, focusing on layout of temparature field and its influence on thermal stress of used materials, describes their history, kinds and ongoing research. Thesis shortly describes light and its characteristics, heat and heat transfer and means of temperature measurement. Main part of the tesis is dedicated to measuring front headlamp serving as a fog light, concretely measuring temperature field and illuminance depending of ambient temperature. Thesis contains everything from the first preparations, creation of measuring circuit, programming of measuring to processing acquired data. Thesis also compares cooler used for cooling luxmeter sensor, the comparision is between measured values and created simulation.
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Switching LED Driver Using Buck-Boost Structure
Šmerda, Jaroslav ; Kincl, Zdeněk (referee) ; Kubíček, Michal (advisor)
Control and driving high luminous LED is an issue that is dealt, because the technology of LED have grew in recent years. The power of these diodes is supplied almost always with DC converters. These converters operate on the principle of switching power supply, and they are devices with high efficiency. Because of the high efficiency of converters in combination with a high luminous LED leads to very efficient energy processing to light. This project describes how to select the right converter for a specific application of LEDs. There are described basic converter topologies, descriptions of their activities and LED wiring example to the converter.
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Comparison of pulse oximeters
Karafiátová, Pavla ; Harabiš, Vratislav (referee) ; Kolář, Radim (advisor)
This work deals with the pulse oximetres. The thesis describes the methods of measuring oxygen in blood and basic parts of pulse oximeter. It follows introduction to light absorbancy based on Beer’s law and its usage in pulse oximetry. The thesis also describes different probes and its properties and also algorithms for signal processing. Measuring and evauating on tester SECULIFE and volunteers is part of this thesis.
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Design of stabilized optical source
Novák, Michal ; Chmelař, Milan (referee) ; Filka, Miloslav (advisor)
The aim was to design a stabilized optical light source operating at a wavelength of 1 625nm, suitable for measuring the attenuation of optical fiber transmission method. Source should be stabilized by optical feedback and output should be washed 0dB, 5 db and 10 db. There have been described in various peripheral components such as LEDs and laser diodes, the method of dividing the optical signal and its measurement of a PIN photodiode and avalanche photodiode. Furthermore, optical attenuator, which in this design has played an important role. With it's optical power is stabilized. They were also briefly described three basic methods of measuring attenuation of optical lines. Proposal for construction has been described switched power supply that provides voltage and current surge into the laser diode and the voltage stabilizer is used to power optical attenuator. The work also solved the optical attenuator control voltage output current from the photodiode.
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Fundamental properties of semicomductor materilas
Kahánek, Tomáš ; Jirák, Josef (referee) ; Špinka, Jiří (advisor)
This work deals with fundamental properties of semiconductors materials and methods of their measuring. This work is focused on non-contact methods using light to generate electric charge in semiconductor. Tests were focused on measuring characteristics of PN transition light diods and semiconductor specimen with big resistivity, there was founded absorption edge of silicon.
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Design of Experiment
Lachnit, Zdeněk ; Bednář, Josef (referee) ; Kotek, Luboš (advisor)
The main subject of this master thesis is to evaluate using of Design of Experiment in industrial company in the development of LED modules for cars. In background study Design of Experiment methodology is described. Next part of background study describes the general principles of termography measurements, next chapter includes the information’s about LED technology and temperature degradation. At the beginning of the practical part is a description of the team analysis due to selection of factors, next chapter validates importance of vias. In next chapter methodology of print circuit board preparations and measuring are described. A next chapter describes the implementation of design of experiment at voltages 8 V, 13,5 V, 16,5 V. Designs of Experiments were made for four or five factors. The reason for this decision was the manual adjustment of printed circuit boards. At the end of each Design of Experiment is the recommendation of factors and interactions settings with regard on response, which is the minimal temperature. At the end of master’s thesis is the final evaluation.
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