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Estimation of measurement uncertainty with the use of uncertainty database calculated for optical coordinate measurements of basic geometry elements

Owczarek D., Ostrowska K., Harmatys W, Sładek J.

Advances in Science and Technology. Research Journal

2015

Vol. 9, nr 27

112--117

The paper presents a method for estimating the uncertainty of optical coordinate measurement based on the use of information about the geometry and the size of measured object as well as information about the measurement system, i.e. maximum permissible error (MPE) of the machine, selection of a sensor, and also the required measurement accuracy, the number of operators, measurement strategy and external conditions contained in the developed uncertainty database. Estimation of uncertainty is done with the use of uncertainties of measurements of basic geometry elements determined by methods available in the Laboratory of Coordinate Metrology at Cracow University of Technology (LCM CUT) (multi-position, comparative and developed in the LCM CUT method dedicated for non-contact measurements) and then with the use of them to determine the uncertainty of a given measured object. Research presented in this paper are aimed at developing a complete database containing all information needed to estimate the measurement uncertainty of various objects, even of a very complex geometry based on previously performed measurements.

Wykorzystanie optycznych pomiarów współrzędnościowych w określeniu dokładności geometrycznej prototypów implantów czaszkowych wykonanych technologią RP

Kudasik T., Markowska O., Miechowicz S.

Pomiary Automatyka Kontrola

2014

R. 60, nr 4

195--198

Artykuł przedstawia możliwości zastosowania optycznych systemów pomiarowych w określeniu dokładności geometrycznej prototypów implantów czaszkowych wykonanych technologią RP. Badania zostały przeprowadzone przy użyciu skanera optycznego Atos Triple Scan. Modelami badawczymi były prototypy implantów kości sklepienia czaszki wykonane w technologiach: SLA, FDM, PolyJet oraz 3DP. Przeprowadzona analiza pozwoliła jednoznacznie stwierdzić, że zastosowane technologie RP można zastosować w procesie uzupełniania ubytków kostnych sklepienia czaszki, ponieważ ich dokładność mieści się w zakresie ± 0,5mm, wystarczającej czaszkowej implantologii.

The paper presents the possibilities of using optical coordinate measuring systems for determining the geometrical precision of cranial implants prototypes made by Rapid Prototyping technology. Section 2 provides the description of the prototypes of cranial bone implants made in SLA, FDM , 3DP and PolyJet technologies. This prototypes served as research models (Fig. 4). The Reverse Engineering process is also presented in Section 2. On the basis of the RE process the acquired data was used to reconstruct the numerical models of skull defects and their supplements (Figs. 1-3). The verification of the geometrical accuracy was based on measurements made with use of an optical scanner of GOM Com-pany - the Atos Triple Scan (Fig. 5). The description of the measurement process is provided in Section 3 (Figs. 6-9). The results are given in Section 4 (Figs. 10-13). After the research , it was found that the RP technologies could be applied to the process of filling individual cranial bone defects. Their accuracy is within ± 0.5 mm which is sufficient in the cranial implants. By matching the implant to the anatomical structures of a particular patient the improved treatment effects are achieved. In addition, the frequent need for repeated operations resulting from poor fit is eliminated. The benefits of an individual approach to specific medical cases, far outweigh the high cost associated with the manufacture of such implants.