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Suche nach „[J.] [Müller]“ hat 7 Publikationen gefunden
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    DigitalFraunhofer AWZ CTMTMaschinenbau und Mechatronik

    Zeitschriftenartikel

    P. Müller, Jochen Hiller, Y. Dai, J. Andreasen, H. Hansen, L. Chiffre

    Quantitative analysis of scaling error compensation methods in dimensional X-ray computed tomography

    CIRP Journal of Manufacturing Science and Technology, vol. 10, no. August, pp. 68-76

    2015

    DOI: 10.1016/j.cirpj.2015.04.004

    Abstract anzeigen

    X-ray Computed Tomography (CT) has become an important technology for quality control of industrial components. As with other technologies, e.g., tactile coordinate measurements or optical measurements, CT is influenced by numerous quantities which may have negative impact on the accuracy and repeatability of dimensional and geometrical measurements. The aim of this paper is to discuss different methods for the correction of scaling errors and to quantify their influence on dimensional measurements. Scaling errors occur first and foremost in CT systems with no built-in compensation of positioning errors of the manipulator system (magnification axis). This article also introduces a new compensation method for scaling errors using a database of reference scaling factors and discusses its advantages and disadvantages. In total, three methods for the correction of scaling errors – using the CT ball plate, using calibrated features measured by CMM and using a database of reference values – are presented and applied within a case study. The investigation was performed on a dose engine component of an insulin pen, for which several dimensional measurands were defined. The component has a complex geometry and is made of brass, which makes its measurements with CT challenging. It is shown that each scaling error correction method results in different deviations between CT measurements and reference measurements from a CMM. Measurement uncertainties were estimated for each method, taking into consideration the contributions related to the applied correction method. The newly suggested approach using the database appeared to work well, indicating, that if the properties of a CT system under investigation are monitored using a reference object (ball bar in our case), a correction factor based on individual selected magnification factors can be applied for scaling error correction of any object, and thus no additional scanning of a reference object is needed.

    Fraunhofer AWZ CTMTMaschinenbau und Mechatronik

    Zeitschriftenartikel

    P. Müller, Jochen Hiller, Y. Dai, J. Andreasen, H. Hansen, L. Chiffre

    Estimation of measurement uncertainties in X-ray computed tomography metrology using the substitution method

    CIRP Journal of Manufacturing Science and Technology, vol. 7, no. 3, pp. 222-232

    2014

    DOI: 10.1016/j.cirpj.2014.04.002

    Abstract anzeigen

    This paper presents the application of the substitution method for the estimation of measurement uncertainties using calibrated workpieces in X-ray computed tomography (CT) metrology. We have shown that this, well accepted method for uncertainty estimation using tactile coordinate measuring machines, can be applied to dimensional CT measurements. The method is based on repeated measurements carried out on a calibrated master piece. The master piece is a component of a dose engine from an insulin pen. Measurement uncertainties estimated from the repeated measurements of the master piece were transferred on to additionally scanned uncalibrated workpieces which provided the necessary link for achieving traceable measurements.

    Fraunhofer AWZ CTMTMaschinenbau und Mechatronik

    Zeitschriftenartikel

    P. Müller, A. Cantatore, J. Andreasen, Jochen Hiller, L. Chiffre

    Computed Tomography as a Tool for Tolerance Verification of Industrial Parts

    Procedia CIRP, vol. 10, pp. 125-132

    2013

    DOI: 10.1016/j.procir.2013.08.022

    Abstract anzeigen

    Computed tomography (CT) is becoming an important technology for industrial applications, enabling fast and accurate control of manufactured parts. In only a few minutes, a complete 3D model of a part may be obtained, allowing measurements of external and internal features. This paper presents results of tolerance verification of a plastic housing for an insulin pen manufactured by Novo Nordisk A/S. Calculation of measurement uncertainties was taken into account in decision making regarding the specified tolerance limits. Variables in terms of CT systems, data sets, and evaluation software are considered in this study.

    Maschinenbau und Mechatronik

    Zeitschriftenartikel

    U. Farwick, E. Angert, Simone Walker-Hertkorn, M. Kübert, J. Müller

    Wärme aus altem Bergwerksschacht – Möglichkeiten der Tiefen Geothermie im Wohnungsbau

    bbr - Fachmagazin für Brunnen- und Leitungsbau (Sonderheft Tiefe Geothermie), vol. 61, pp. 80-82

    2010

    NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenTC Teisnach 2 Sensorik

    Beitrag (Sammelband oder Tagungsband)

    J. Schulze, W. Ehrfeld, J. Hoßfeld, M. Klaus, Maria Kufner, S. Kufner, H. Müller, A. Picard

    Parallel optical interconnetion using self adjusting microlenses on injection moulded ferrules made by LIGA technique

    Proceedings of Optical System Design and Production

    1999

    NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenTC Teisnach 2 Sensorik

    Zeitschriftenartikel

    K.-H. Brenner, Maria Kufner, S. Kufner, J. Moisel, A. Müller, S. Sinzinger, M. Testorf, J. Göttert, J. Mohr

    Application of three-dimensional micro-optical components formed by lithography, electroforming, and plastic molding

    Applied Optics, vol. 3232, no. 92, pp. 6464-6469

    1993

    DOI: 10.1364/AO.32.006464

    Abstract anzeigen

    Micro-optics is usually associated with planar waveguides or integrated optical circuits. In this case the propagation of light is restricted to one or two dimensions, and the three-dimensional nature of light propagation is disregarded. We present a method of fabricating three-dimensional micro-optical components by the so-called LIGA process, a lithography, electroforming, and plastic molding process in which poly(methyl methacrylate) is structured by high-energy synchrotron radiation. We demonstrate an experimental system of image formation that uses microprisms and microlenses for a three-dimensional microintegration of optical components.

    NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenTC Teisnach 2 Sensorik

    Beitrag (Sammelband oder Tagungsband)

    K.-H. Brenner, M. Frank, Maria Kufner, S. Kufner, J. Moisel, A. Müller, S. Sinzinger, M. Testorf, J. Göttert, J. Mohr

    Microoptical setup with microlenses and microprisms based on refractive optics

    Proceedings of SPIE Vol. 1806: Optical Computing

    1992