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The evaluation of accuracy and eligibility coordinate machines PIONEER DEA
Hrdlička, Martin ; Zahálka, Jiří (referee) ; Pernikář, Jiří (advisor)
This bachelor thesis deals with the accuracy and the qualification of coordinate measuring instrument Pioneer Dea. A target of the thesis is to represent measurement uncertainty using a method of International Vocabulary of Basis and General Terms in Metrology, and for the selected product to determine a qualification of the check process. The evaluation of the qualification of the measuring instrument is performed via method of coefficients cg and cgk. In addition there are calculated measurement uncertainty and via qualification indicator gpp the check process of the selected product is evaluated.
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The use of nanofibres strain gauges for construction of linear sensors
Kirchner, Jan ; Kůr, Jan (referee) ; Pernikář, Jiří (advisor)
The aim of this thesis was to determine the basic characteristics of behavior of nanofiber strain gauges and on the basis of experimental measurements to confirm the suitability of the design of the length sensors. There was a product designed with a swivel arm whose rotation burdens the nanofiber strain gauge affixed to the flat side of the cut. Some measurements were carried out to find out a suitable direction of the loading pressure and to reveal the area showing the linear behavior. This linear area is approximately between 44 ÷ 92 % of the range of the nanostrain gauge (0% maximum load tensile, 100% maximum load pressure). Other measurements dealt with temporal stability of the output value at each point. The outcome of these experiments was to determine the methodology and to propose the design of sensors for further tests, the aim of which was to develop a sensor for measuring small diameters (from 1 to 5 mm). K
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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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Determination of device geometrical misalignments influence on dimensional measurements in X-ray microcomputed tomography
Blažek, Pavel ; Klapetek, Petr (referee) ; Zikmund, Tomáš (advisor)
Tato práce se zabývá geometrickými nepřesnostmi v geometrii rentgenového počítačového tomografu (CT přístroj). Především jejich vlivem na výsledky metrologických měření a metodami kterými lze tyto negativní efekty eliminovat. V práci jsou prezentovány výsledky simulací CT měření v softwaru aRTist při kterých byli nastavovány nepřesnosti v pozici detektoru a osy rotace vzorku. Ukazuje se tak, které geometrické faktory mají na měření největší vliv. Praktická část se pak zabývá CT přístrojem HeliScan, který využívá unikátní rekonstrukční algoritmus k eliminaci geometrických nepřesností. Jsou vyvinuty referenční objekty (pláty s rubínovými kuličkami a zirkonová koule), které splňují požadavky normy VDI/VDE 2630 1.3. na testování metrologických schopností přístroje. Objekty vhodné pro měření ve větším zorném polem byly vyrobeny, zkalibrovány a otestovány v CT měření.
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Quality Management system for the calibration of linear gauges
Dobeš, Jan ; Koška, Petr (referee) ; Pernikář, Jiří (advisor)
This bachelor thesis deals with the issues of calibration of gauges. The aim of the thesis is to create detailed calibration procedures and examplary measurements of selected types of length gauges. These gauges are gauge blocks, dial indicator, caliper, micrometer. This measuring was implemented in the calibration laboratory TM Technik s. r. o., where autor could obtain experiences from employees and discuss with them about these topics.
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Calibration of GOM ATOS optical coordinate measuring machines
Košťák, Ondřej ; Jankových, Róbert (referee) ; Harčarík, Matej (advisor)
This master’s thesis contains the basic division of 3D methods which are used for reconstruction of measured objects. Furthermore the types of structured light patterns used for 3D triangulation. It also contains a description of the construction and functions of GOM ATOS and TRITOP machines. Primarily the thesis deals with the calibration of these machines, the design of suitable materials standard of size and the internal calibration methodology used by ŠKODA AUTO a.s. The text also includes verification of the proposed calibration procedure in practice, proposal for determination of calibration uncertainties and recommendations for practice.
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