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Uncertainty and compatibility of direct frequency measurement
Zikmund, Ondřej ; Zavřel, Jiří (referee) ; Havlíková, Marie (advisor)
This thesis is focused on evaluation of direct measurement of frequency with the calculation of the standard uncertainty. The part of this thesis is comparison of frequency measurement through the different digital measuring instrument with reference measuring instrument – the scaler HP 53131A. The main aim in thesis is to master the methodology of uncertainty calculation and the evaluation of compatibility of measurement. The result of this thesis is comparison of results of frequency measurement through HP 53131A, GFC-8131H, HP 34401A, M-3890D including the graphic interpretation.
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Evaluation Of Uncertainties Of River Flow Measurements With Propeller Current-Meter
Niemiec, Łukasz ; Macura,, Viliam (referee) ; Kožnárek, Zdeněk (referee) ; Starý, Miloš (advisor)
The development of hydrology and the need of getting exact data increase the demands on hydro metering. Measurement of spot velocities and deriving the flow of water are frequently performed by the workers of Český hydrometeorologický ústav (Czech Hydrometeorological Institute) and other companies. The limited precision of the measuring machines, the imperfection of methods and the influence of human senses cause that we are not able to get the accurate value of quantity. We are just close to the right values. The term uncertainty of measuring determines the interval which is assigned to each measurement and contains the real value of measured quantity. Twenty imminently repeated measurement were done in twelve measuring profiles of the Dyje River and in one profile of the Morava River using the current meters OTT (OTT Hydromet, 2013) type C2 and type C31. We investigated the dependence of uncertainties type A and B in different profile parameter. The measurement was done with the suspension bar with 2 to 4 propeller current-meters. The hydrometric car on the bridge was used in deeper waters. The results were analysed from the point of view of the uncertainties and generalized. Next point of the research was to find out how the frequency of the current meter depends on temperature of water. For this purpose, the specific canal was made in the Faculty of Civil Engineering in Brno (Ústav vodního hospodářství krajiny) and the measuring was done in temperature interval from 1 °C to 24 °C. Repeated measuring was statistically evaluated from the uncertainties point of view. In the thesis, the proposal of elaboration of uncertainties determined by both types of measurement into current methods of determination of uncertainties of the derived flows using the measurement of spot velocity by the propeller current-meter in measuring profiles of the rivers is introduced.
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Uncertainty and compatibility of direct frequency measurement
Zikmund, Ondřej ; Zavřel, Jiří (referee) ; Havlíková, Marie (advisor)
This thesis is focused on evaluation of direct measurement of frequency with the calculation of the standard uncertainty. The part of this thesis is comparison of frequency measurement through the different digital measuring instrument with reference measuring instrument – the scaler HP 53131A. The main aim in thesis is to master the methodology of uncertainty calculation and the evaluation of compatibility of measurement. The result of this thesis is comparison of results of frequency measurement through HP 53131A, GFC-8131H, HP 34401A, M-3890D including the graphic interpretation.
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Evaluation Of Uncertainties Of River Flow Measurements With Propeller Current-Meter
Niemiec, Łukasz ; Macura,, Viliam (referee) ; Kožnárek, Zdeněk (referee) ; Starý, Miloš (advisor)
The development of hydrology and the need of getting exact data increase the demands on hydro metering. Measurement of spot velocities and deriving the flow of water are frequently performed by the workers of Český hydrometeorologický ústav (Czech Hydrometeorological Institute) and other companies. The limited precision of the measuring machines, the imperfection of methods and the influence of human senses cause that we are not able to get the accurate value of quantity. We are just close to the right values. The term uncertainty of measuring determines the interval which is assigned to each measurement and contains the real value of measured quantity. Twenty imminently repeated measurement were done in twelve measuring profiles of the Dyje River and in one profile of the Morava River using the current meters OTT (OTT Hydromet, 2013) type C2 and type C31. We investigated the dependence of uncertainties type A and B in different profile parameter. The measurement was done with the suspension bar with 2 to 4 propeller current-meters. The hydrometric car on the bridge was used in deeper waters. The results were analysed from the point of view of the uncertainties and generalized. Next point of the research was to find out how the frequency of the current meter depends on temperature of water. For this purpose, the specific canal was made in the Faculty of Civil Engineering in Brno (Ústav vodního hospodářství krajiny) and the measuring was done in temperature interval from 1 °C to 24 °C. Repeated measuring was statistically evaluated from the uncertainties point of view. In the thesis, the proposal of elaboration of uncertainties determined by both types of measurement into current methods of determination of uncertainties of the derived flows using the measurement of spot velocity by the propeller current-meter in measuring profiles of the rivers is introduced.
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