Measurement of temperature induced X-ray tube transmission target displacements for dimensional computed tomography
| Autor: | Stefanie Neuhaus, Benjamin A. Bircher, Felix Meli, A. Kung |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
0209 industrial biotechnology
Materials science business.industry Radiography General Engineering 02 engineering and technology X-ray tube Scale factor 01 natural sciences Displacement (vector) Finite element method law.invention 010309 optics Interferometry 020901 industrial engineering & automation Optics Position (vector) law 0103 physical sciences business Beam (structure) |
| Zdroj: | Precision Engineering. 72:409-416 |
| ISSN: | 0141-6359 |
| DOI: | 10.1016/j.precisioneng.2021.06.002 |
| Popis: | We characterised the displacement of a transmission X-ray tube target parallel to the beam axis due to thermal effects using interferometry. Displacements of up to 10 μm with a sensitivity of about 0.4 μm/W deposited power were measured relative to the X-ray tube's mechanical mounting position. They significantly influence the scale factor of dimensional computed tomography measurements by several 10−4 at high geometric magnifications. Finite element simulations revealed that the displacement is due to thermal deformation of the entire target assembly and helped to derive a linearised model that predicted the displacements within a few tenths of a micrometre. Radiographic measurements of a calibrated standard confirmed that the mechanical displacement of the target corresponded with the X-ray focal spot position. The findings help to increase the accuracy of dimensional X-ray computed tomography measurements and to ameliorate the design of transmission X-ray tubes. |
| Databáze: | OpenAIRE |
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