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Kalibracija merilnih kladic : SOP 4
Andrej Godina, Bojan Ačko, 2006, treatise, preliminary study, study

Keywords: tehnološke meritve, kalibracija naprav, merilne kladice, akreditacija postopkov
Published: 31.05.2012; Views: 1113; Downloads: 47
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Kalibracija tračnih meril : SOP 23
Andrej Godina, Bojan Ačko, 2006, treatise, preliminary study, study

Keywords: tehnološke meritve, kalibracija naprav, tračna merila, akreditacija postopkov
Published: 31.05.2012; Views: 1025; Downloads: 34
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Kontrola dolžinskih meril po MID : SOP 27
Andrej Godina, Bojan Ačko, 2006, treatise, preliminary study, study

Keywords: tehnološke meritve, kalibracija naprav, dolžinska merila, akreditacija postopkov
Published: 31.05.2012; Views: 1158; Downloads: 19
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New approach to uncertainty evaluation in the calibration of gauge block comparators
Andrej Godina, Bojan Ačko, Marjan Družovec, 2007, original scientific article

Abstract: Gauge blocks (GBs) are being calibrated by two methods: interferometric calibration and calibration by mechanical comparison to reference GB. While interferometric method represents primary level, comparison is more suitable for calibrating industrial GBs because of lower costs and shorter calibration time. Although no significant changes in equipment happened in last decade, improvements in mechanical comparison are on-going. In addition to the uncertainty of the reference GB calibration, uncertainty of the GB comparator is the most important contribution to total uncertainty of the mechanical calibration. The article introduces a new approach for evaluating the uncertainty of GB comparator calibration. The uncertainty budget and results of analytical and experimental evaluation of all contributions are presented. This approach results in lower end-effect uncertainty and a slightly higher length dependent uncertainty, in comparison with the uncertainty evaluation procedure as described in EA document EA-10/02.
Keywords: measurements, calibration, measuring uncertainty, gauge block, comparator, CMC, mechanical comparison
Published: 31.05.2012; Views: 1422; Downloads: 67
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Simulation of line scale contamination in calibration uncertainty model
Marjan Družovec, Bojan Ačko, Andrej Godina, Tatjana Welzer-Družovec, 2008, original scientific article

Abstract: Precise calibration of quartz line scales is very important for assuring traceability of microscopic measurements. Very significant influence in calibration uncertainty budget is represented by uncertainty of line centre detection. Line centre is usually detected through video signal processing using different types of algorithms. This paper is presenting calibration procedure that was developed in the Laboratory for Production Measurement at the Faculty of Mechanical Engineering in Maribor. It is focused in uncertainty analysis and especially in the influence of line scale contamination on determination of line centre position. Different types of line scale contamination like dirt spots, scratches, line edge incorrectness, and line intensity were simulated in order to test the ability of the line centre detection algorithm to eliminate such influences from the measurement results.
Keywords: line scale, calibration, uncertainty, video-positioning system, simulation
Published: 31.05.2012; Views: 999; Downloads: 58
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