TY - JOUR A1 - Neugebauer, M. A1 - Hilpert, U. A1 - Bartscher, M. A1 - Gerwien, N. A1 - Kunz, S. A1 - Neumann, F. A1 - Goebbels, Jürgen A1 - Weidemann, Gerd T1 - Ein geometrisches Nomal zur Prüfung von Röntgen-Mikro-Computertomografiemesssystemen KW - Geometrische Normale KW - Röntgen-Mikro-Computertomografie KW - Dimensionelles Messen KW - Messgeräteprüfung KW - Geometrical standard KW - X-ray micro-computertomography KW - Dimensional measurement KW - Instrument testing PY - 2007 SN - 0340-837X SN - 0178-2312 SN - 0171-8096 VL - 74 IS - 11 SP - 565 EP - 571 PB - Oldenbourg CY - München AN - OPUS4-22881 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Weidemann, Gerd A1 - Stadie, R. A1 - Goebbels, Jürgen A1 - Hillemeier, B. T1 - Computed tomography study of fibre reinforced autoclaved aerated concrete PY - 2008 SN - 0025-5300 VL - 50 IS - 5 SP - 278 EP - 285 PB - Hanser CY - München AN - OPUS4-22882 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Kamenz, C. A1 - Weidemann, Gerd T1 - Heavy metal - A contrasting substance for micro-tomographical visualization of scorpion book lungs N2 - Remarkable results obtained while searching for suitable contrasting agents for tomographical imaging are presented. Book lungs, the respiratory organs of scorpions (Scorpiones, Arachnida), served as challenging objects in terms of fragility and preparatory requirements, as well in terms of size differences between the entire organ and its functional subunits (the lamellae). The problem of tissue contrast was investigated using various metals, but most successfully addressed using osmium. Gaseous osmium tetroxide exposure with subsequent ethanol treatment yielded the best results. A constant and thorough staining of the book lungs was achieved, easing book-lung visualization using 3D-reconstructions from µCT scans. KW - Osmium tetroxide KW - muCT KW - X-ray KW - Contrast KW - Respiratory organ PY - 2009 DO - https://doi.org/10.1016/j.micron.2009.05.007 SN - 0047-7206 SN - 0968-4328 VL - 40 IS - 8 SP - 911 EP - 917 PB - Pergamon Press CY - Oxford AN - OPUS4-20095 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Görner, Wolf A1 - Berger, Achim A1 - Ecker, Klaus A1 - Haase, Oskar A1 - Hedrich, Martina A1 - Segebade, Christian A1 - Weidemann, Gerd A1 - Dudek, Gabriele T1 - Broad band application of combined instrumental photon and neutron activation analysis PY - 2001 SN - 0236-5731 SN - 1588-2780 SN - 1417-2097 N1 - Geburtsname von Dudek, Gabriele: Wermann, G. - Birth name of Dudek, Gabriele: Wermann, G. VL - 248 IS - 1 SP - 45 EP - 52 PB - Elsevier Sequoia CY - Lausanne AN - OPUS4-11229 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Tomandl, G. A1 - Mangler, M. A1 - Stoyan, D. A1 - Tscheschel, A. A1 - Goebbels, Jürgen A1 - Weidemann, Gerd T1 - Characterization methods for functionally graded materials N2 - In this paper the characterisation of functionally graded materials is elucidated by several different methods. These methods described here are used for the quantitative analysis of materials with a local dependence of microstructure parameters. Using X-ray microscopy (computed tomography) for 3D-measurements and optical microscopy on polished sections for 1D and 2D measurements on the same sample, a ceramic filter consisting of sintered spherical particles, various mathematical evaluation methods are described and compared. KW - Functionally graded materials KW - Computed tomography KW - X-ray microscopy KW - Optical microscopy KW - Ceramics PY - 2006 DO - https://doi.org/10.1007/s10853-006-6632-6 SN - 0022-2461 SN - 1573-4803 VL - 41 IS - 13 SP - 4143 EP - 4151 PB - Springer Science + Business Media B.V. CY - Norwell, Mass. AN - OPUS4-13722 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Bartscher, M. A1 - Hilpert, U. A1 - Goebbels, Jürgen A1 - Weidemann, Gerd T1 - Enhancement and Proof of Accuracy of Industrial Computed Tomography (CT) Measurements KW - Coordinate Measuring Machine (CMM) KW - X-ray KW - Uncertainty PY - 2007 SN - 0007-8506 SN - 1726-0604 VL - 56 IS - 1 SP - 495 EP - 498 PB - Elsevier CY - Oxford AN - OPUS4-15738 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Rabe, Torsten A1 - Goebbels, Jürgen A1 - Weidemann, Gerd A1 - Riesemeier, Heinrich A1 - Rudert, Rainer T1 - Green Body Characterization by Computed Tomography with Synchrotron Radiation T2 - Symposium Grünkörpercharakterisierung ; 8. Keramik-Tag der BAM CY - Berlin, Germany DA - 2001-05-28 PY - 2001 SN - 0177-6983 VL - 16 IS - 2 SP - 204 EP - 210 PB - Bauverlag CY - Bad Honnef AN - OPUS4-1835 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Rack, A. A1 - Zabler, S. A1 - Müller, Bernd R. A1 - Riesemeier, Heinrich A1 - Weidemann, Gerd A1 - Lange, Axel A1 - Goebbels, Jürgen A1 - Hentschel, Manfred P. A1 - Görner, Wolf T1 - High resolution synchrotron-based radiography and tomography using hard X-rays at the BAMline (BESSY II) N2 - The use of high brilliance and partial coherent synchrotron light for radiography and computed tomography (CT) allows to image micro-structured, multi-component specimens with different contrast modes and resolutions up to submicrometer range. This is of high interest for materials research, life science and non-destructive evaluation applications. An imaging setup for microtomography and radiography installed at BESSY II (a third generation synchrotron light source located in Berlin, Germany) as part of its first hard X-ray beamline (BAMline) can now be used for absorption, refraction as well as phase contrast — dedicated to inhouse research and applications by external users. Monochromatic synchrotron light between 6 keV and 80 keV is attained via a fully automated double multilayer monochromator. For imaging applications the synchrotron beam transmitted by the sample is converted with a scintillator into visible light. By use of microscope optics this luminescence image is then projected onto, e.g., a CCD chip. Several scintillating materials are used in order to optimise the performance of the detector system. Different optical systems are available for imaging ranging from a larger field of view and moderate resolutions (macroscope — up to 14 mm x 14 mm field of view) to high resolution (microscope — down to 0.35 μm pixel size), offering magnifications from 1.8× to 40×. Additionally asymmetric cut Bragg crystals in front of the scintillator can be used for a further magnification in one dimension by a factor of about 20. Slow and fast cameras are available, with up to 16 bit dynamic range. We show the suitability of the setup for numerous applications from materials research and life science. KW - Microtomography KW - Non-destructive evaluation KW - Synchrotron instrumentation KW - Coherent imaging KW - X-ray refraction KW - Phase contrast KW - Holotomography KW - Synchrotron-CT KW - Scintillator KW - Bragg magnification PY - 2008 DO - https://doi.org/10.1016/j.nima.2007.11.020 SN - 0168-9002 SN - 0167-5087 VL - 586 IS - 2 SP - 327 EP - 344 PB - North-Holland CY - Amsterdam AN - OPUS4-17738 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Nusser, K. A1 - Mosbauer, T. A1 - Schneider, G. J. A1 - Brandt, K. A1 - Weidemann, Gerd A1 - Goebbels, Jürgen A1 - Riesemeier, Heinrich A1 - Göritz, D. T1 - Silica dispersion in styrene butadiene rubber composites studied by synchrotron tomography N2 - By means of synchrotron X-ray computed tomography, model composites consisting of silica and styrene–butadiene rubber were studied with a very high spatial resolution. By our analysis technique we were able to determine the nano- and micro dispersion from the experimental results by our numerical analysis. These results are discussed with respect to crucial advantages of the generically 3-dimensional tomography technique as compared to 2-dimensional methods. Our quantitative analysis of the 3d images demonstrates that in the case of our model composites the filler dispersion is good, independent on the filler concentration. Our new 3-dimensional results evidence that considering only 2-d pictures may lead to ambiguities that can lead to wrong conclusions. KW - X-ray tomography KW - Silica KW - Styrene butadiene rubber KW - Dispersion PY - 2012 DO - https://doi.org/10.1016/j.jnoncrysol.2011.10.009 SN - 0022-3093 VL - 358 IS - 3 SP - 557 EP - 563 PB - North-Holland Publ. Co. CY - Amsterdam AN - OPUS4-26105 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -