Počet záznamů: 1  

On-the-fly fast X-ray tomography using a CdTe pixelated detector – application in mechanical testing

  1. 1.
    0494940 - UTAM-F 2019 RIV US eng J - Článek v odborném periodiku
    Kumpová, Ivana - Vopálenský, Michal - Fíla, Tomáš - Kytýř, Daniel - Vavřík, Daniel - Pichotka, Martin - Jakůbek, Jan - Keršner, Z. - Klon, J. - Seitl, S. - Sobek, J.
    On-the-fly fast X-ray tomography using a CdTe pixelated detector – application in mechanical testing.
    IEEE Transactions on Nuclear Science. Roč. 65, č. 12 (2018), s. 2870-2876. ISSN 0018-9499
    Grant CEP: GA MŠk(CZ) EF16_019/0000766
    Institucionální podpora: RVO:68378297
    Klíčová slova: cadmium telluride (CdTe) detectors * fracture mechanics * material characterization * mechanical testing
    Kód oboru RIV: JB - Senzory, čidla, měření a regulace
    Obor OECD: Electrical and electronic engineering
    Impakt faktor: 1.428, rok: 2018

    Fast tomography measurements are still done almost exclusively within the domain of synchrotrons. However, recent progress in radio diagnostic instrumentation has enabled researchers to perform time-lapse computed tomography (4D-CT) even under laboratory conditions with standard X-Ray sources. Thus, fast time-dependent processes within materials with relatively high X-Ray attenuation can be monitored. The article describes the in-situ tomographic monitoring of crack formation and propagation in a quasi-brittle silicate matrix composite subjected to three point bending. A three-dimensional CT volume containing the region of interest (ROI) in the specimen is imaged over a period of time while the continuously increasing load causes crack initiation and propagation, creating a dynamic volume dataset. An acquisition time of 50 seconds for one full angle tomography with 400 projections makes this tomographic system one of the fastest systems in the world. The resulting visualizations provide qualitative information concerning progressive crack propagation within areas of lower material density. Differential images then allow displaying the spatial orientation of the crack over time. The results were further processed for a quantitative analysis of image quality using various methods of beam hardening correction.
    Trvalý link: http://hdl.handle.net/11104/0288021