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Enhancement of optical diagnostics of the switching arc
Samohejl, Matěj ; Kloc, Petr (referee) ; Valenta, Jiří (advisor)
This master´s thesis si focused on determinig methodology of optical diagnostics of the switching arc using the high-speed camera Photron SA-X2. The thesis contains basic rules for proper setup of the measurement system and the rules to adjust the camera exposure. The experiments were performed on the prototype of a parametric switching chambre, while the majority of source materials was derived from the requirements of another study which was aimed on the movement of the electode spots. The process of the first adjustment of the camera, a record edit options for the presentation purposes and the process of the 3D model design of the switching arc in SketchUp software was stated. Paper contains a comparsion of the spectral filter effect and neutral density filter effect on the final record as well. The part of the work outputs are the 3D model of the switching arc and the supporting record editing software. The paper results show a degree of the inaccuracies in a optical diagnostics made from only one direction caused by the lack of the information about third dimension.
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Interesting cases of fluid mechanics
Čáp, Filip ; Hájek, Ondřej (referee) ; Jedelský, Jan (advisor)
This bachelor thesis deals with the description of some interesting phenomena in the field of fluid mechanics, methods of flow visualization and its recording using a high-speed camera. First, a number of terms and different types of fluid flow are briefly introduced, which is followed by the description of the methods of visualization that enhance the visibility of flow of liquids and gases. The thesis also describes high-speed cameras and examines some interesting effects in fluid dynamics which can be encountered in everyday life as well as in engineering practice. The last chapter is then dedicated to the conducted experiments and their recordings.
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Measurement and evaluation of high-speed process
Šťastný, Michal ; Zahálka, Jiří (referee) ; Kotek, Luboš (advisor)
This bachelor thesis follows up the issue of high-speed camera systems. First part of this thesis outline some historical milestones of high-speed shooting and describe the basic principle of image processing with a digital camera. Next part of this thesis is focused on comparison of high-speed camera systems of the most known producers. Finally there is the measurement by high speed camera Olympus i-SPEED 2 and it’s evaluation at the end of thesis.
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Development of DC arc quenching chamber
Černohorský, Petr ; Valenta, Jiří (referee) ; Šimek, David (advisor)
Seminar thesis focuses on the issues about quenching the electric direct arc by the quanching system. Teoretical part deals with action about quanching the direct arc and with another actions which happens in direc discharge. There is described proposal and construction of the insulating quenching system. Than chamber was testing in high voltage laboratory and the results from testing was evaluated.
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Analysis of human tremor by using hight speed camera
Kuder, Zenon ; Čmiel, Vratislav (referee) ; Rychtárik, Milan (advisor)
This thesis investigates the possibility of using the Olympus iSpeed 3 high-speed camera and light-emitting diodes in visible light spectrum to analyse human tremor of upper limbs. Moreover, it discusses possible realization of a measurement apparatus including software implemented in the Matlab environment. The system is then tested on a small sample of healthy subjects.
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Usage of high-speed camera in the area of switching arc
Samohejl, Matěj ; Bušov, Bohuslav (referee) ; Valenta, Jiří (advisor)
This bachelor´s thesis is focused on optimizing recording of electrical switching arc in magnetic switches by high-speed camera. Measurements were performed on the circuit breaker 10B without removed side case, which was subsequently cowled by neutral density filter. The voltage and current of the circuit breaker contacts were acquired by measuring system of the Laboratory of switching arc diagnostics. The energy source was motor-generator with a nominal power 16 MVA and test bench consisting of a capacitors and inductors, which have been tuned to the resonance frequency of 50 Hz. Evaluation of the measurements was taken with regard to the brightness distribution levels of the record. Results showed that the mean brightness value varies on the square of the current passing through. For proper localization of the arc, it is necessary to appropriately set the camera exposure. The main problem usually is to darken the scene enough. It was found that it is necessary to take into account that brightness level change depends nonlinear on the exposure offset. The thesis gives a proposal to determine the exposure shift of the record. The possibility of usage high-speed camera to determine the temperature distribution in the arc using the brightness equiintensities was also designed. There are mentioned suggestions how to improve recording of the arc in circuit breakers, especially in the arrangement of the optical parts.
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Usage of a high-speed camera for a study of changes of a lubricating film.
Mucha, Roman ; Křupka, Ivan (referee) ; Svoboda, Petr (advisor)
The aim of Bachelor´s thesis is to give an overview of the state of knowledge in the field of usage of a high-speed camera for a study of changes of a lubricating film. The first part desribes the basic terms in the field of high-speed camera. The next part of thesis deals with the history of high-speed cameras and their use in an industry, including study of changes of a lubricating film. Finally, evaluation of current status and further development are included.
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Switching arc plasma diagnostics by usage of two high-speed cameras
Buchta, Martin ; Dostál, Lukáš (referee) ; Valenta, Jiří (advisor)
This bachelor thesis deals with an electrical arc formation and its properties. The thesis also describes some of the electrical devices and principles, which are used for arc extinction. It is mainly focused on design, construction and testing of model of the LV quenching system, which allows high speed cameras to record arc movement. Recorded images are then used to create three-dimensional reconstruction of the electric arc with help of created program 3DMaker. The final reconstruction is the output of this work.
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Critical d.c. load current test of low-voltage devices
Fůsková, Karolína ; Ing. Zdeněk Mlynář (OEZ s.r.o.) (referee) ; Dostál, Lukáš (advisor)
This thesis deals with problems connected with circuit breakers for direct current. It explains mechanism and construction of small circuit breakers and molded case circuit breakers (MCCB) focusing on the using in AC and DC circuits. There is also explained direct current and related issues. For example, issue with DC arc breaking. An important part of this work is high-speed camera measurement of critical direct current and short circuit breaking with subsequent evaluation with PFV tool. The important part of this thesis is assessment of the critical load current for used circuit breakers
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