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Data acquisition - LabVIEW
Jeřábek, Martin ; Zůbek, Tomáš (referee) ; Šedivá, Soňa (advisor)
The main objective of this work is to create a program for automatic operation of measuring test track. The track is used for multi-hole velocity probes calibration. Normalized orifice plate is used as measurement standard. The program requires the user to enter certain information, which are not measured directly e.g. the values of measuring resistors, static air pressure. After entering this information, measurement can be started. The measurements are carried out simultaneously on the both flowmeters and on the thermomether Pt 100. The actual density of flowing medium is calculated from the measured temperature. Because the measurement is parallel, the calibrated flowmeter can be calibrated during the measurement.
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Expressing uncertainty of accurate lenght measurement II
Šrámek, Jan ; Pernikář, Jiří (referee) ; Koška, Petr (advisor)
This diploma thesis is supposed to inform readers interested in the distance measurements uncertainty on practical issues connected with the solving of these troubles when utilising a frequently used calibration method - the Tesa NPL measure instrument. 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 (CMI) 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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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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Meaurement process automatization of deviations and stability of oscilators
Čermák, Jan ; Nováková Zachovalová, Věra (referee) ; Havlíková, Marie (advisor)
This Master´s thesis on a topic ,,Meaurement process automatization of deviations and stability of oscilators‘‘ describes methods for measuring the difference of time scales. Using this method, calculates the parameters of the oscillator, which is also describes in this work. Parameters of the oscillator means inning and stability. Describes is the procedure for calculating the uncertainties and their presentation in the final calibration sheet. This Master´s thesis also describes the practical measurement with this method in the Czech metrology institute in Brno. Measurement of the parameters of oscillator by the method of measurement of the difference of time scales is carried out automatically by computer. This Master´s thesis deals with the creation and development of new software and thus the automation of the entire task.
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Meaurement process automatization of Zener reference
Bábek, Tomáš ; Nováková Zachovalová, Věra (referee) ; Havlíková, Marie (advisor)
This thesis deals with metrology specialized to DC voltage. In the begining of thesis is explanation of technical terms from metrology, summarization of units from International System and explanation of the standards and its kinds in the context of metrology. Primary standards of DC voltage based on Zener diodes and Josephson effect are described as well. In cooperation with Czech metrology institute in Brno this work is focused on automatization of measuring Zener reference standards (ZRS). Goal of this project is to automatize the measuring of Zener reference standards and its relationship with Josephson voltage system using scanner. To do this, there is a need to find out offsets, that can develop on scanner's channels. There is a theoretical analysis of measuring made on the scanner and their uncertainties. Aim of the solution is computation of scanner channels offsets using everyday automatic measuring the system of Zener reference standards (ZRS). For measuring the LabView was used and for computing the data from measured values the Matlab was used. This thesis should short the time needed when measuring DC voltage references, measure values of DC voltage standards and set the scanner channels offsets. In the end there is a summarization of offsets measured on individual scanner channels.
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Design of a suitable length standard for nanometology at the CMI Brno and CEITEC Brno
Češek, Jakub ; Jankových, Róbert (referee) ; Šrámek, Jan (advisor)
The thesis deals with the design of a suitable length standard for nanometrology. This length standard will be used for metrological traceability of the Rigaku nano3DX located at CEITEC Brno and the SIOS NMM-1 device which is located at ČMI Brno. The first part is focused on the description of these measuring instruments, the analysis of their metrological traceability requirements and the requirements for the material length standard. The second part is devoted to the concrete possibilities of the etalon design, 3D printing of the prototype of the standard and verification of its dimensional compatibility. At the end of the thesis, the evaluation and selection of the appropriate standard design is made.
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Calibration rutines of the standard Datron 4920
Schinneck, Jakub ; Bednář, Pavel (referee) ; Havlíková, Marie (advisor)
This master’s deals with the calibration routines of the alternating voltage measurement standard Datron 4920. The first part introduces the basic terminology of metrology, its history and organizations specializing in metrology. The thesis describes the alternating voltage at the highest metrological level through AC/DC difference. The theoretical part also describes the alternating voltage measurement standard Datron 4920 and its measurement functions together with the calibration routines. The main aim of thesis is to create the calibration procedures AVMS Datron 4920. Based on the created calibration procedures, a flowchart of application for calibration routines is designed. The practical part then continues with programming application for calibrating AVMS Datron 4920 based on the created flowchart. In conclusion, the application is tested at selected points of measurement and an analysis of measurement uncertainties is carried out.
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Methods of Accurate Measurement of Low Impedances
Mašláň, Stanislav ; Sedláček,, Radek (referee) ; Bilík, Petr (referee) ; Beneš, Petr (advisor)
Overall topic of presented thesis is development of methods of measurement of low impedances below 10 Ohm in a frequency range up to 1 MHz. The thesis comprises of three main parts. First part of thesis describes design of unique and simple calculable standards of resistance that are used for calibration of the bridge and as the reference standards for the calibrations. Next part of theses is focused on design of digital sampling bridge in various topologies suitable for measurement of various types of impedance standards up to frequency of 1 MHz. The thesis describes the HW components, data processing and corrections scheme allowing the designed bridge to reach expanded uncertainties (k=2) below 0.005% and 250 µrad at 1 MHz. One of the key points of the proposed corrections scheme is unique automatic linearity calibration method requiring minimal operator's effort. The theses also describes integration of Spice model of the bridge the bridge SW that allowed validation of functionality of the bridge and also analysis of uncertainty contributions related to interferences between the bridge components. The last part of the thesis shows selection of measurements of known impedances and international comparisons that proofs performance of the bridge.
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