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Development of laboratory samples for wireless transmission of electric power based on the magnetic induction
Kopečný, David ; Štěpánek, Jaroslav (referee) ; Krbal, Michal (advisor)
The aim of the thesis is to collect the information about wireless transmission by using magnetic induction and about the current solutions of wireless applications in practice. The thesis includes theoretical basis and information about the current state of wireless power applications. This thesis is also focused on physical principle and draft of possible technical solution. On top of that, it also contains the information from some legislative and hygienic regulations. The second aim is draft of laboratory equipment on the base of gained information and its implementation for purpose of teaching and measuring. For this part was chosen topology of circuit and the specifications of resonance circuits. It resulted in producing a preparation, which consists of the exciter, primary circuit, secondary circuit and a module for measuring. The third aim is to take a measurement on this product and evaluation of characteristic from point of view of efficiency. Measured data were integrated into characteristics. The efficiency of transfer was measured depending on distance and used load. At the same time was also observed work frequency of product. Furthemore, another laboratory product was measured, in which was reached the efficiency more than 51%. The thesis is divided into four main chapters, which can be thematically named as follows: the information, the theory, the draft and the measurement. The first two chapters deal with the theory and characterization of technologies of already applied systems mainly from transport. The following two chapters contain the description of proposal of the product and the very measuring of the efficiency.
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Photobiological Safety of luminaires and Light Sources
Štěpánek, Jaroslav ; Bendová,, Zdeňka (referee) ; Vik,, Michal (referee) ; Škoda, Jan (advisor)
This doctoral thesis called “Photobiological safety of luminaires and light sources” has focused on an optical radiation and its relation to human body. The thesis describes possible consequences on living tissue during excessive exposure to optical radiation. Among others the work deals with the light source, lamp and optical devices evaluation in dependence of photobiological safety. There is created a method of light source evaluation procedure for photobiological safety in accordance with ČSN EN 62471. The meaning of this procedure is based on its hazard calculation from measured values of irradiation to different photometric distances. Validity of procedure is verified by light source measuring, in which visual angle and photometric distance have been changed. There we can also find an application of this procedure in the UV source evaluation, which helps to determine a safe distance away from UV sources not to create any danger. The evaluated UV sources include a UVA luminaire with a dominant wavelength of 365 nm or an arc of an electric welder. The thesis also describes a method of evaluating light sources for blue light hazard for an aphakic and pseudophakic eye. This method can also help to determine the hazard for the eye without lens or with some implanted lens. Furthermore, there was developed the method of the blue light hazard assessment depending on the age of an exposed person. In terms of the work there was also created a computer programme evaluating photobiological safety resulting from the spectral data having been stored in the library programme or from spectroradiometric measurement data. The work also marginally deals with the topic of circadian rhythms, which are closely related to photobiological manifestation in an human body. Above all the work compares light sources for which equivalent illuminances are calculated, consequently light sources have the same effect on suppressing the melatonin hormone production.
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Photobiological safety evaluation of light sources for household use
Jelínek, Jakub ; Motyčka, Martin (referee) ; Štěpánek, Jaroslav (advisor)
This thesis deals with the photobiological safety of light sources used for household lighting. The theoretical part of the thesis is devoted to areas related to photobiological safety, such as the basic description of vision functions, the description of light sources, as well as methods of measurement and evaluation. In the practical part, the spectrum of individual light sources is measured, from which the irradiance limits are calculated, according to which the source is assigned to the appropriate group of hazards.
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Street Lighting Control
Kořenek, Jan ; Krbal, Michal (referee) ; Štěpánek, Jaroslav (advisor)
This bachelor thesis deals in a theoretical part with the origin of the light, his features and lighttechnical quantities. There are also characterized light sources, which are currently most used to control street lighting. There are further described basics of the street light and currently most used ways of street lighting control. Further part of this thesis is focused on practical control of different types of light sources and monitoring their parameters, such as luminous flux, power, efficiency or correlated colour temperature during voltage reduction. These light sources are high pressure sodium lamps, halogenid lamp, fluorescent lamp and high pressure mercury lamp. Main conclusion from measurements are several cross characteristics, where is possible to monitor behavior of the parameters during voltage reduction. The last part concerned about practical street lighting control in Bezděkov, which is a village located near Havlíčkův Brod. There was connected the dimmer. On the street was created net of points according to the standard. In these points were measured illuminance for voltage 230 V and then for lower voltages 210 V and 190 V. These values were processed and average and minimum value was compared with the value defined in the standard.
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Lighting system reconstruction in the Sokol hall
Kattauer, Jakub ; Štěpánek, Jaroslav (referee) ; Škoda, Jan (advisor)
The thesis is focused on the problems of illumination of interior space, especially in object in Moravský Písek. The thesis is divided into two parts, where the first part deals in general with the basic quantities and terms which are used in illumination systems. Further, it is about general properties of lights and about general terms of illumination of interiors. The second part is only practical character. At the beginning, there is used manual measurement and modelling to evaluate initial state in program Relux. The measurement is not met in terms of standards. Thanks to the municipal council of Moravský Písek a new lighting system is created, which fully respects the valid normative regulations. Installation of control system of lighting is integrated to proposal, which would result in lower consumption, greater user comfort and greater versatility in the possible use of the object. In the end, there is financial evaluation of illuminating system and comparison classical with led technology.
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The effect of operating position of the light source on the photometric parameters
Šťastný, Jakub ; Štěpánek, Jaroslav (referee) ; Škoda, Jan (advisor)
The theses discusses how operating position and ambient temperature affect electric light sources. For the purposes of this theses, the analysis of light radiation, the description and the principle of taking measurements of light quantities are included. The work also contains the principle of function, construction and parameters of light sources. For each light source a hypothesized impact of the operating position of the light source and the impact of ambient temperature variation on radiated luminous flux are stated. For selected light sources a measurement of the impact of the operating position on the sources’ photometric parameters was taken. The output measurement data are being compared to the theoretical hypotheses. The conclusion of the thesis describes suggested recommendations for the operation of light sources based on both theoretical and practical parts of the thesis.
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Design of the morning sun simulator
Suský, Stanislav ; Krbal, Michal (referee) ; Štěpánek, Jaroslav (advisor)
This work deals with the introduction of the influence of electromagnetic radiation on circadian rhythms and their influence on the organism. The work describes circadian rhythms and their influence on the organism, the location and description of functions of important organs and the influence of electromagnetic radiation on these organs. There are described light sources and their influence on circadian rhythms.
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Ecology in lighting
Špidlík, Jan ; Štěpánek, Jaroslav (referee) ; Krbal, Michal (advisor)
This bachelor’s thesis is focused on introduction to ecology in lighting technology. There are briefly described individual light sources and chemical substance used in the manufacture of components. For clarity is amount of toxic mercury in each light source displayed in well-arranged picture. Thesis is also focused on the influence of lighting technology in the environment and impact on the ecosystem. Closer look is made upon influence of mercury on environment and human life and also overall influence of mining metals and its devastating consequences for ecosystem. This work also deals with post processing of light sources by collective systems.
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Methods of ignition spark gaps
Pekárek, Dominik ; Štěpánek, Jaroslav (referee) ; Krbal, Michal (advisor)
This thesis deals with methods of spark gap ignition. The thesis describes spark gap ignition by external electrode, by Rogowski electrode and by lasers. Advantages and disadvantages of these methods are also discussed. In the final part of the thesis there is described experiment with high voltage spark gap.
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Measuring of parameters dimmable LED sources
Kubeša, Radek ; Štěpánek, Jaroslav (referee) ; Baxant, Petr (advisor)
The bachelor thesis deals with the dimmable LED light sources. The theoretical part at the beginning is devoted to the light and the basic photometric quantities, analyzes the light sources and their parametres. It also describes the operating principle of LEDs, construction, power, and control the brightness of LED light sources. The practical part is focused on the measurement and evaluation of operating parameters selected samples of LED light sources.
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