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Coaxial multiplexer for automatic measurement of AC current
Boštík, Ondřej ; Klusáček, Stanislav (referee) ; Havlíková, Marie (advisor)
Master’s thesis in the theoretical part deals with literature review on the topic of measurement errors and measurement uncertainties. The practical part deals with the simulation of additional capacitive and resistive load on the amplitude and phase error during shunts based measurement. For this simulation is used mathematical apparatus of cascade matrix of two-ports and their connections. For the actual simulation is used script for MATLAB. Furthermore, the work deals with the design of voltage follower to eliminate simulated errors and its practical realization. The last part deals with the design of the coaxial multiplexer for switching current shunts developed in the Czech Metrological Institute in Brno.
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Gas flow measurement
Slováček, Antonín ; Šedivá, Soňa (referee) ; Beneš, Petr (advisor)
The diploma thesis brings a description and realization of new measuring devices which are designed to support student´s laboratory practice of air flow measurement techniques. The new devices and laboratory exercises help students get experience of several methods of measuring which they get to know during mandatory Bachelor's and Master's study programmes. The paper also includes a theoretical background, the knowledge of which is necessary for mastering the issue. Moreover, the paper comprises a literary search of sensors and a market research. The second part of the thesis presents possibilities of the laboratory workplace, and the results of the measurements of the new laboratory devices used for sample laboratory exercises.
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Measurement uncertainties determined by the Monte Carlo method
Krejčí, Roman ; Havlíková, Marie (referee) ; Šedivá, Soňa (advisor)
This bachelor thesis deals with the determination of the uncertainties of direct and indirect measurements. It focused on the uncertainty calculation by Monte Carlo method and GUM uncertainty framework. The practical part deals with the determination of uncertainties indirect measurement of resistance Ohm’s method. The calculated uncertainties are compared on the basis of the influence of the method, accuracy used devices and the temperature.
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Comparison of different temperature sensors accuracy
Szotkowski, Radek ; Šimonová, Lucie (referee) ; Frk, Martin (advisor)
The Bachelor thesis deals with precise temperature measurument using various temperature sensors thermometers. Resistive temperature sensors, thermocouples and measurument uncertainty are studied. In practical part are mathematically and graphically presented results of measuring in three temperature points. Emphasis is placed on the accuracy of individual temperature sensors. The thesis also includes a laboratory task created for subject matters dealing with diagnosis.
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Analysis of the electrical power measurement system in the local distribution network Pod Palackého vrchem
Hájková, Barbora ; Orságová, Jaroslava (referee) ; Jurák, Viktor (advisor)
The diploma thesis introduces a detailed analysis of the local distribution system (LDS) Pod Palackého vrchem (PPV) in the Brno, parameters of power transformers and cable routes between them. The elements of the electrical network that are influencing the balance of reactive power are described along with its sources and appliances. In the next part is defined the present concept of long-term measurement in the LDS by using current and voltage sensors. This part deals with calculations of power losses in the power transformers and the cable lines together with uncertainties concerning power measurement in the field of energetics. The essential part of the thesis focuses on the analysis of the temporary measurement implementation in the LDS, data processing along with the comparison of measured values from temporary measurement with values from permanent measurement. In conclusion, the error of the system is determined.
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Calibration management system of measuring machine (CMM)
Lysý, Zbyněk ; Pernikář, Jiří (referee) ; Koška, Petr (advisor)
This diploma thesis with title of „Management of Coordinate Measuring Machine Calibration“ aimed to develop detailed analysis of uncertainties when deploying 3D coordinate measuring machine MicroVu Excel in practice. The analysis was supported by an example of measuring uncertainty calculation. This thesis also discusses the integration of automatic assessment of uncertainties into programming equipment; and creation of methodical calibration process for this kind of machine.
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Methodology for calibration of containers and tanks
Vrátil, Šimon ; Brno, Miroslava Benková, ČMI OI (referee) ; Vdoleček, František (advisor)
This diplomathesis work is dealing with a concept of volumetric calibration of vessels using the volumetric method. The analysis considers current regulations together with influence of uncertainties in measurements. The principal part of the thesis is analysis of metrological uncertainties resulting from application of various volumetric methods during the calibration process. A practical outcome from this research is development of metrological process for calibration of vessels that could be used by the accredited laboratories.
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Zvýšení efektivity kontroly ramene tankovací nádrže
Sobotková, Kateřina ; Tůma, Jiří (referee) ; Blecha, Petr (advisor)
The diploma thesis consists of a new design of a controlling procedure for a plastic component of a tank. Its theoretical part deals with the potential sources of errors and uncertainties arising from the measuring itself. It also deals with the characteristics of available CMM devices and includes an analysis of the methods assessing the acceptability of the measurement plan. The practical part analyses systematically the current state and proposes a new solution using a program created using a coordinate machine. A comparison of both variants is presented as an output of the thesis.
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