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Microphone cable tester
Vaněk, Pavel ; Kufa, Jan (referee) ; Polák, Ladislav (advisor)
This bachelor work deals with the electricial design and development of a handheld measuring device for microphone cables using time domain reflectometry method. The main aim of the work is to choose a suitable measuring method for locating faults on cables, develop electricial design and create its practical implementation. The build of firmware for the microcontroller unit is also the part of works. The measurement is based on a time-to-digital converter integrated circuit used in Light Detection and Ranging (LIDAR) applications. The designed device was completely implemented and tested by a set of practical measurements.
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Microphone cable tester
Vaněk, Pavel ; Kufa, Jan (referee) ; Polák, Ladislav (advisor)
This bachelor work deals with the electricial design and development of a handheld measuring device for microphone cables using time domain reflectometry method. The main aim of the work is to choose a suitable measuring method for locating faults on cables, develop electricial design and create its practical implementation. The build of firmware for the microcontroller unit is also the part of works. The measurement is based on a time-to-digital converter integrated circuit used in Light Detection and Ranging (LIDAR) applications. The designed device was completely implemented and tested by a set of practical measurements.
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Permeability of sandstone surfaces and water flow in shallow zone of ruiniform sandstone landscape
Sysel, Ondřej ; Slavík, Martin (advisor) ; Tesař, Miroslav (referee)
Water in porous rocks (e.g. sandstone) plays a fundamental role in their disintegration. However, the places where water enters the sandstone rocks are somewhat overlooked. At two sites in the Český ráj region, I use Karsten tube to measure capillary water absorption (CWA) of natural sandstone exposures and, using TDR (Time Domain Reflectometry) method, I study movement of water in a shallow zone of ruiniform sandstone landscape. The CWA differed up to four orders of magnitude at a distance of tens of meters, mostly depending on the type of the surface. The highest CWA was measured at highly weathered surfaces, the second most absorbent were less weathered surfaces covered with a biologically-initiated rock crust. The horizontal surfaces on the tops of the rock formations were even less absorbent, probably due to clogging by fine particles from soil. Surfaces covered with iron crust were the least absorbent. The differences between those surfaces are significant. After simulated infiltration, the maximum rate of the propagation of the wet front in the sandstone was from 5,5.10-6 do 1,9.10-4 m.s-1 measured by TDR. The water propagated at this rate only to a certain depth (the first tens of cm), but then the propagation stopped or slowed down rapidly. From a long-term measurement of volumetric...
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Evaluation of water regime monitoring in Roklan site
Čejková, E. ; Sněhota, M. ; Tesař, Miroslav ; Dohnal, M.
Contribution focuses on soil water regime in the mountainous site Roklan, which is located in the first zone of the National Park Sumava. Spruce monoculture forest in the location was devastated by bark beetle and then left to natural regeneration. The soil hydrological and meteorological monitoring is performed since 2011. Presented paper reports on soil hydraulic properties of the soil from the site. Then, the TDR water contents data collected in the site are compared with the water content data obtained by calculation from the pressure head data using the known water retention curves. The data for two selected rain episodes are presented in detail and results are discussed.
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