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Pulsed current source for a flash xenon lamp
Nakládal, Martin ; Roubal, Zdeněk (referee) ; Steinbauer, Miloslav (advisor)
This bachelor thesis focuses on the design of a special impulse current source, which is used to power a xenon lamp with a short-term power-up function. The pulse source will be part of a modernized nanosecond laser flash spectrometer. The proposed pulse source is designed to allow the Xenon lamp to be over-flashed to up to 100 times. The power supply allows a pulse current setting within interval 50 to 500 A and with a duration of 0.5 to 10 ms. The power supply has built-in overload protection and control functions, including lamp end-of-life indication.
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Measurement of Discharge Light Sources Parameters
Štěpánek, Jaroslav ; Krbal, Michal (referee) ; Baxant, Petr (advisor)
The aim of my bachelor’s thesis is to provide a summary about discharge lights sources. It deals with their light and electric qualities. The work is divided into theoretical and practical part. The theoretical part pays attention to the construction of light sources; it provides information about photometric parameters and explores the connections the light sources into the power network. It describes the discharge lamp subtypes and subcategories. In practical part the quality of light sources is measured and the following results of measurement are evaluated.
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Design and construction of an apparatus to simulate material degradation
SLAVÍK, Radek
The bachelor's thesis deals with the design, construction and testing of a device for simulating material degradation (PSDM). In PSDM, UV radiation is generated, to which the samples are exposed. The samples are also exposed to temperature fluctuations in an attempt to approximate natural climatic temperature variations. A 400 W UV black light mercury discharge lamp is used to generate UV radiation, which approximately generates UVA radiation in the wavelength range of 350 nm - 400 nm. In addition, four Repti Planet UVB lamps, each with a power of 26 W, generate UV radiation, approximately generate UVB radiation in the wavelength range of 290 nm - 350 nm. A convection freezer and a refrigerator are used to simulate temperature fluctuations. Furthermore, the temperature fluctuations are applied to the samples in the PSDM and a dryer with adjustable temperature. The device was tested on a pilot set of samples according to a 30-day schedule that approximately respected the weather conditions. After sample exposure, an analysis of the results was performed by comparing the weights and SEM analysis using an electron microscope. In comparing the weights of the samples, an average decrease of 0,14 % in the weights of the samples simulated in PSDM was observed compared to the original weights of the samples. Differences in the structure of the samples were observed in the SEM analysis. The reference sample showed a duller edge structure of the material with minimal surface damage. Furthermore, there was a small amount of morphological formations with blunt edges on the surface. In the sample exposed to PSDM, sharper edge structures of the material and cavities on the surface were observed. Moreover, greater surface degradation of the sample was observed. The results of the analyses suggest that the resistance of PLA material for FDM 3D printing to weather conditions and UVA and UVB radiation may be significantly higher than generally assumed.
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Pulsed current source for a flash xenon lamp
Nakládal, Martin ; Roubal, Zdeněk (referee) ; Steinbauer, Miloslav (advisor)
This bachelor thesis focuses on the design of a special impulse current source, which is used to power a xenon lamp with a short-term power-up function. The pulse source will be part of a modernized nanosecond laser flash spectrometer. The proposed pulse source is designed to allow the Xenon lamp to be over-flashed to up to 100 times. The power supply allows a pulse current setting within interval 50 to 500 A and with a duration of 0.5 to 10 ms. The power supply has built-in overload protection and control functions, including lamp end-of-life indication.
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Measurement of Discharge Light Sources Parameters
Štěpánek, Jaroslav ; Krbal, Michal (referee) ; Baxant, Petr (advisor)
The aim of my bachelor’s thesis is to provide a summary about discharge lights sources. It deals with their light and electric qualities. The work is divided into theoretical and practical part. The theoretical part pays attention to the construction of light sources; it provides information about photometric parameters and explores the connections the light sources into the power network. It describes the discharge lamp subtypes and subcategories. In practical part the quality of light sources is measured and the following results of measurement are evaluated.
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