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On-the-Fly Fast X-Ray Tomography Using a CdTe Pixelated Detector-Application in Mechanical Testing

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 (4-D CT) even under laboratory conditions with standard X-ray sources. Thus...

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Published in:IEEE transactions on nuclear science 2018-12, Vol.65 (12), p.2870-2876
Main Authors: Kumpova, Ivana, Vopalensky, Michal, Fila, Tomas, Kytyr, Daniel, Vavrik, Daniel, Pichotka, Martin, Jakubek, Jan, Kersner, Zbynek, Klon, Jiri, Seitl, Stanislav, Sobek, Jakub
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creator Kumpova, Ivana
Vopalensky, Michal
Fila, Tomas
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Vavrik, Daniel
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Jakubek, Jan
Kersner, Zbynek
Klon, Jiri
Seitl, Stanislav
Sobek, Jakub
description 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 (4-D 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. This paper describes the in situ tomographic monitoring of crack formation and propagation in a quasi-brittle silicate matrix composite subjected to three-point bending. A 3-D CT volume containing the region of interest in the specimen is imaged over a period of time, while the continuously increasing load causes crack initiation and propagation, creating a dynamic volume data set. An acquisition time of 50 s 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.
doi_str_mv 10.1109/TNS.2018.2873830
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subjects Attenuation
Cadmium compounds
Cadmium telluride (CdTe) detectors
Computed tomography
Crack initiation
Crack propagation
Data processing
Detectors
Diagnostic systems
fracture mechanics
Image processing
Image quality
Instrumentation
material characterization
Mechanical properties
mechanical testing
Mechanical tests
Medical imaging
Propagation
Quantitative analysis
quasi-brittle material
Synchrotrons
Time dependence
Tomography
X ray sources
X-ray imaging
X-ray imaging techniques
X-ray instrumentation
X-ray tomography
title On-the-Fly Fast X-Ray Tomography Using a CdTe Pixelated Detector-Application in Mechanical Testing
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