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Uncertainties of measurements of the dynamic viscosity
Januš, Petr ; Rozsívalová, Zdenka (referee) ; Frk, Martin (advisor)
The thesis is deal with measuring the temperature dependence of dynamic viscosity and the calculation of measurement uncertainties. The thesis writes up the physical nature of viscosity and rheological properties. Next it is write up an overview of possible methods for measuring viscosity of liquids and overview of methods for measuring the density of liquids. An important chapter is the statistical evaluation of measured data represented mainly measurement uncertainties. In the practical part of the work is done workplace for measure the temperature dependence of dynamic viscosity. It is used two methods of measuring viscosity of liquids and two samples of liquids. Finally is done statistical evaluations of measurement. Based on the calculated measurement uncertainty measurement methods are compared.
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Measuring system of photovoltaic panels efficiency
Hofman, Jiří ; Háze, Jiří (referee) ; Vaněk, Jiří (advisor)
This diploma thesis is focused on development and initial run of a measurement system whose aim is to measure photovoltaic panel efficiency. Experimental photovoltaic panel is installed outside the laboratory. Measurement system consists of the solar radiation measurement module (pyranometer), photovoltaic panel load module (panel power measurement) and panel climate measurement module. Data from measurement module is being captured via control computer for subsequent analysis of panel efficiency and climatic impacts on it.
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Erors and Uncertainties in Temperature Measurement
Jirmásek, Jakub ; Vojáček, Zdeněk (referee) ; Vdoleček, František (advisor)
Bachelor thesis is focused on sources of temperature measurement uncertainties and their expressing. There is a basic description of the temperature as a physical quantity and its scale. The study describes some kinds of thermometers, focusing primarily on electric thermometers which have a dominant position in the field of automation and regulation. Further the importance of measurement uncertainty is described and its expressing. More space is devoted to the importance of different sources of uncertainty and possible compensation. Finally there is an example of determining the measurement uncertainty.
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Evaluation of control processes
Šimák, Martin ; Koška, Petr (referee) ; Pernikář, Jiří (advisor)
This bachelor thesis studies the theory of evaluation of control processes. The first part of the thesis discusses about organization of national legislation and metrology legislation. The next part of the study focuses on metrology terms, theory introduction to measurement uncertainty and their expression. The final section of the thesis is devoted to statistic evaluation of processes.
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The expression of the accuracy of the gauge and measurement
Svobodová, Helena ; Koška, Petr (referee) ; Pernikář, Jiří (advisor)
The bachelor thesis deals with the issue of measurement, accuracy of measuring instruments and their expressing. It outlines the legislative basis of metrology in the Czech Republic and interprets the definitions of basic terms used in metrology. These definitions are listed in the new edition of International dictionary of metrology (VIM 3:2007). It specifies and exemplifies measurement errors and presents possibilities of their elimination. Further, it describes a simple way of measurement uncertainty determination. The aim of this thesis is to explain the issue in a way that it is understandable and can be applicable for the common metrology practice.
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Uncertainties of Accurate Length Measurement
Šrámek, Jan ; Brno), Václav Duchoň (ČMI (referee) ; Vdoleček, František (advisor)
This diploma thesis is supposed to inform readers interested in the distance measurements un-certainty on practical issues connected with the solving of these troubles when utilising a frequently used calibration method - the SIP distance meter. This measuring was implemented by the Czech Metrologic Institute, where the author works; therefore he could take advantage of his rich experience as well as experience of his superiors and colleagues. The author regards the national metrological institute (ČMI) as a sufficient guarantee for the hereinafter presented materials, both regarding the professional qualification and from the perspective of formal rightness of this thesis.
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Verification of glucose assessment analytical method
ILLEOVÁ, Kateřina
The topic of laboratory accreditation as well as validation and verification of analytical methods has been very current in recent years. Because of the serious impact of analytical results of the measurement on practice, it is required that the results of the analytical measurements were as accurate as possible. This paper deals with the verification of the analytical method determination of glucose, as proof of achieving optimum measurement uncertainties. The verification of spectrofotometric glucose determination was performed using the Cobas Integra 800 analyzer by enzymatic hexokinase method. For the measurement in time the control materials of internal quality control were used and for the measurement in series the control materials of external quality control were used. From the measured values we specified the necessary statistical data (the arithmetic mean, standard deviation, the coefficient of variation, bias, yield) and using these we specified the values of combined and extended uncertainty. The combined uncertainties of both samples shouldn't be higher than 10 %, according to the SEKK association. The combined uncertainty of our first sample was 6.81 % and the second one had 6.45 %. The extended uncertainty of the first sample was 13.62 % and the second one had 12.90 %. From these data, we can conclude that the verification of analytical methods for the determination of glucose succeeded.
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