Manufacturing Technology 2020, 20(5):566-575

Use of computed tomography in dimensional quality control and NDT

Libor Beránek1, Dora Kroisová2, Štěpánka Dvořáčková2, Jan Urban1, Jan Šimota1, Vladislav Andronov1, Lukáš Bureš1, Lukáš Pelikán1
1 Faculty of Mechanical Engineering, Czech Technical University in Prague, Technická 4, Praha 6, 16000. Czech Republic
2 Faculty of Mechanical Engineering, TU Liberec, Studentska 2, 461 17 Liberec 1, Czech Republic

The article deals with the application of computed tomography in dimensional quality control. The advantage of computed tomography is that the measured part is not influenced by measuring force. It is possible to measure complex parts and assemblies, their geometry, internal structure and defects in one step. The disadvantage of CT is decreasing accuracy and resolution when measuring hi density materials or larger parts, which leads to usage of high accelerating voltage and current. The measurement result is influenced by many factors, not only the instrument itself and the set of measuring parameters, but also largely depends on the sample itself, on its material and geometry. Based on the requirements for dimensional inspection, an analysis of the dependences of individual parameters of the Zeiss METROTOM 1500 computed tomography was conducted. The dependence of the spot size of the X-Ray source on the accelerating voltage and current was determined for the given instrument, as well as the relation between the voxel size and the distance of the sample from the detector. Spot size and voxel size has to be in relation, since large spot size goes against high magnification, high resolution meaning small voxel size. Using calibration artefact, the influence of the acceleration voltage on the accuracy when measuring form and size of a sphere and the distance between centres of 2 spheres was evaluated.

Keywords: Computed tomography, Voxel size, Spot size
Grants and funding:

SGS grant of CTU in Prague. The Center of Advanced Aerospace Technology (CZ.02.1.01/0.0/0.0/16_019/0000826), Faculty of Mechanical Engineering, Czech Technical University in Prague.

Received: July 31, 2020; Revised: November 16, 2020; Accepted: November 23, 2020; Prepublished online: November 23, 2020; Published: December 14, 2020  Show citation

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Beránek L, Kroisová D, Dvořáčková Š, Urban J, Šimota J, Andronov V, et al.. Use of computed tomography in dimensional quality control and NDT. Manufacturing Technology. 2020;20(5):566-575.
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