| Zugriffsnummer | 33968 |
| Dokumenttyp | Konferenzartikel in Zeitschrift |
| Peer Review | mit Peer Review |
| Sprache | Englisch |
| Titel | An efficient procedure for traceable dimensional measurements and the characterization of industrial CT systems |
| Autor(in); Institution |
Illemann, Jens; 5.3, Koordinatenmesstechnik, PTB-Braunschweig
Bartscher, Markus; 5.3, Koordinatenmesstechnik, PTB-Braunschweig
Neuschaefer-Rube, Ulrich; 5.3, Koordinatenmesstechnik, PTB-Braunschweig
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| Quelle/Jahr | Digital Industrial Radiology and Computed Tomography (DIR 2015): proceedings. Journal of Nondestructive Testing and Ultrasonics:(2015), Aug., 17 S. |
| Availability | [online only] |
| ISSN | 1435-4934 |
| URL | |
| Verlag | Bad Breisig: NDT.net |
| Konferenzangaben | International Symposium on Digital Industrial Radiology and Computed Tomography (DIR 2015), Ghent, 22-25, June, 2015, Belgium |
| Freie Schlagworte | CT system qualification ; dimensional CT ; traceability ; magnification ; geometrical alignment error |
| Zusammenfassung | In industry, cone-beam CT with a flat-panel detector and a micro-focus X-ray source is most used today. The targeted accuracy of its dimensional measurements might however not be reached over the full operating time. Multiple reference CT measurements at different magnifications are usually performed to allow corrections, but are extensive. As a more efficient procedure it is proposed to use 2D grid-like structures traced back to an optical imaging coordinate measuring machine. It is shown and verified by a comparison to a full CT, that with only two radiographic images and an effort of a few minutes of operation time, the magnification of a micro-CT has been determined to better than 2 · 10-5 relatively. It can thus be done in most applications accompanying to each CT measurement. Additionally its function and the adjustment of the micro-CT have been checked by a newly developed cylindrical artefact made of thermoplastics. This avoids beam hardening and incorporates one unidirectional, one bidirectional and one angular measure. |
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