Measuring at the limit / Schirin Heidai Bateni in KUNSTSTOFFE INTERNATIONAL, Vol. 110, N° 3 (2020)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 110, N° 3 (2020) . - p. 31-34 Titre : Measuring at the limit : Special measuring methods extend the range of application for computed tomography Type de document : texte imprimé Auteurs : Schirin Heidai Bateni, Auteur Année de publication : 2020 Article en page(s) : p. 31-34 Langues : Anglais (eng) Catégories : Matières plastiques -- Pièces Mesure Objets en matières plastiques Scanographie Tomographie Index. décimale : 668.4 Plastiques, vinyles Résumé : The requirements of measurement technology vary depending on the measurement task. In addition to the need for high accuracy or short measuring time, the computed tomography sensor also requires the measurability of objects that are difficult to penetrate with X-rays like multi-material workpieces. Different measurement methods are available for such applications. Note de contenu : - Model, measurement result, and deviations displayed - Wide measuring range and high resolution - High-resolution areas with multi-ROI-CT - High density samples and multi-material objects - Measurements every second - Figure : The OnTheFly-CT enables in line measurement and evaluation in the production cycle by saving the dead times for positioning the sample occuring in the conventional start/stop process - Fig. 1 : In the cone beam between the X-ray source and the detector, the sample is penetrated in different rotational positions - Fig. 2 : Calculating volume data by back projection of filtered radiographic images: a) object ; b) X-ray beam path in one section plane; c) principle of stepwise back projection and superimposing ; d) result of reconstruction with different numbers of back projections for a real sample - Fig. 3 : Measuring principles : a) eccentric CT : as the rotary table rotates around its own axis (1), it is simultaneously moved by an X-Y stage along a circular path (2) around the center (3) of the sample. A virtual axis of rotation result at (3) ; b) overview CT ; c) ROI-CT : zone at the center of the sample ; d) Multi-ROI-CT : the principle of eccentric CT is used here to tomographically scan several areas e) measurement result of the high-resolution region - Fig. 4 : Two-spectrum tomography can also be used to measure multi-material samples with high accuracy. Here the different materials of a motorcycle helmet are shown in blue and red, a cross section with measured geometric properties in black En ligne : https://drive.google.com/file/d/1Os6oG-XyBEVBigmiy4bwluxSwVHlZ1qV/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34072 [article]

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