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Glare measurement with a luminance analyser
Kalfus, Petr ; Baxant, Petr (referee) ; Škoda, Jan (advisor)
One of the basic parameters of any lighting is the quality of the illumination design, and how it glares. This paper deals with glare and its evaluation. The basic variables used in its evaluation are described. Methods of evaluating internal glare using various indexes are described. Methods of evaluating glare from daylight and evaluating glare of outdoor systems are also described. The principle of operation of luminance analysers is then described and the school LDA luminance analyser that will be used for the measurements is described. The indoor glare measurements made are described, manually evaluated and calculated and compared with the new automated calculation in the lumiDISP program. The daylight glare and outdoor glare measurements are also described, evaluated and compared with the new automated calculation. Finally, the possibility of measuring glare with a luminance analyser is summarised and the accuracy of the new lumiDISP functions is evaluated
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Measurement of illuminance distribution on roadways using the luminance analyser LDA
Cudrák, Martin ; Škoda, Jan (referee) ; Motyčka, Martin (advisor)
The master's thesis deals with the possibility of measuring road illuminance using the LDA luminance analyser and LumiDISP software. The theoretical part describes luminous quantities, optical properties of selected materials, especially road materials – asphalt, and normative requirements for road lighting. In the practical part, the production of measuring samples is implemented for subsequent field measurements. A series of laboratory and field measurements are carried out in the following section. Based on these measurements, the measurement method and the measurement procedure have been determined and refined. The aim of the master's thesis is to determine the measurement method, the measurement procedure and to quantify the accuracy of the illuminance measurement method using the luminance analyser LDA.
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Analysis of luminance analyser LDA - LumiDISP application for correlated color temperature measurement
Vlček, Pavel ; Škoda, Jan (referee) ; Motyčka, Martin (advisor)
This master's thesis deals with the search of commercially available luminance analysers and cameras that use the measurement of correlated colour temperature. It also deals with calculations of correlated colour temperature according to various available methods. The luminance analyser LDA-LumiDISP is based on a DSLR camera. The principle of its operation and possible errors in capturing pictures are discussed here. The work deals with extensive testing of the LDA-LumiDISP luminance analyser, which is primarily intended for measuring luminance in the set scene, but can also be used to measure the correlated colour temperature. The device is being tested in terms of measuring the correlated colour temperature in laboratory and field conditions. The result of the master's thesis is the calculation of measurements uncertainty for certain light sources and the optimization of the measuring algorithm to reduce them.
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Glare evaluation of exterior lighting systems
Rampák, Dominik ; Baxant, Petr (referee) ; Škoda, Jan (advisor)
Glare is an important, but often overlooked parameter in lighting systems design. This parameter can significantly affect human biorhythm, causing a discomfort or in the worst cases it can dazzle drivers, which can lead to car accidents. Therefore, it´s necessary for lighting designers to consider glare in their designs, specifically threshold increment value. This thesis focuses on glare measurement caused by exterior lighting systems and comparison of usage different types of camera lens for threshold increment measurements with luminance analyser. For a better understanding of the whole issue, there is a part describing how human eye perceives light, which is followed by definition and division of the glare. Afterwards, there is part describing calculation procedure of the threshold increment, which serves as a basis for the practical part of the thesis. Practical part of the thesis is dedicated to experimental measurement of glare from exterior lighting system on Technická street, right behind VUT FEKT T12 building. The measurement is done using luminance analyser and the LumiDISP program, while 3 lenses are used for the measurements. The output of this thesis are values of threshold increment obtained by using 4 different methods (3 lenses) and subsequent comparison of the suitability of the lenses for the glare measurements. To supplement, a simulation of the measured lighting system in the Relux program and a subsequent comparison of the results with the measured values are performed.
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Optical design for LED luminaire
Oravčok, Ján ; Adamec, Michal (referee) ; Škoda, Jan (advisor)
The first part of the thesis is research, which deals with electric luminaires and especially their light-active parts. Subsequently is described the problem of a specific luminaire, which is used during the control of the surface structure of materials. The next part of the thesis deals with the simulation of the current luminaire and the simulations of the proposed solutions that eliminate the shortcomings of the luminaire. The conclusion of this thesis is the evaluation of the originally used luminaire and the benefits of the proposed solution, which showed the best results in the simulation.
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EDUCATION OF TEACHERS IN SELECTED COUNTRIES
Škoda, Jan ; Veteška, Jaroslav (advisor) ; Krámský, David (referee)
This diploma thesis deals with the comparison of education of upper secondary teachers in chosen countries including the Czech Republic. Its objective is to analyse requirements for teachers' training, qualifications and continuing professional development. The thesis primarily looks into the organisation of the education system and governance, legislation and principals of upper secondary teachers' training in chosen countries. The thesis is divided into two main parts. The first one specifies the environment of chosen countries using different criteria (the Czech Republic, England and Wales, Finland) and also the teachers' training, qualification and development dilemma in particular countries is detailed in this part. The countries involved are described in general (geographic location, political system, social, cultural and economic situation). The outline of the development and current situation of each society contributes to the understanding of particular systems of education. Chosen countries are characterised by a considerable geographic distance and also by different historical development. The general information is enhanced with legislation and administration and governance specifics. We can assess the causes and consequences of various factors which can influence teachers' education...
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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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Interior lighting design
Klement, Roman ; Florián, Michal (referee) ; Škoda, Jan (advisor)
This diploma thesis deals with the design of a virtual prototype of a luminaire. Using suitable software tools, a luminaire optics is created and optimised. Luminaire is simulated in the interior, and lighting parameters are evaluated. Finally a suitable design is created.
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Li-Fi, use of light and LED to communicate between luminaires and user
Ludányi, Róbert ; Novák, Daniel (referee) ; Škoda, Jan (advisor)
This thesis is focused on the use of light and LEDs for communication between the light and the user. In the introduction, the principles of VLC, which Li-Fi is part of, are described. The work also contains issues on the topics of Li-Fi, such as methods of modulation of carrier signals for data transmission, comparisons between other wireless communications, individual elements of optical frontends, current versions of Li-Fi and other possible uses of this technology. The work also contains the designing of a system working on the principle of Li-Fi.
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Luminaire position influence on measured parameters in integrating sphere.
Vlček, Pavel ; Škoda, Jan (referee) ; Motyčka, Martin (advisor)
This bachelor thesis deals with the influence of the position of luminaires with narrow radiation characteristics when measured in the integrating sphere. The basic light technical parameters are summarized here. Especially, luminous flux, illuminance, solid angle, luminous intesity and luminance, followed by colour temperature and general colour rendering index. This thesis also deals with the measuring instruments, at first with the basic element, which is the photoelement and then with the following instruments: the illuminance meter, the luminance meter, the spectroradiometer, the goniophotometer and the integrating sphere. The thesis is summarization of the basic information about luminaires. This theory is followed by a laboratory measurement that deals with the measurement of luminaires on a goniophotometer and in the integrating sphere. Goniophotometer measurements are important in conditions of acquire accurate luminous flux. The luminous flux from the goniophotometer is compared with the single measured values in the set positions when measured in the integrating sphere. As a result, the position of the luminaire in the integrating sphere is influenced
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