Synchrotron tomography provides a way for visualising the three-dimensional interior structure of real objects non-destructively and with a high spatial resolution. This allows the detailed microstructural analysis of many different kinds of materials such as small engineering components.
Synchrotron x-ray tomography is based on the detection of either the attenuation or the phase shift of the beam transmitted through a sample. While radiography measures images for a single orientation of the sample, tomography measures images for many different angular positions. This results in a set of projections, which can be used to reconstruct two-dimensional layers or slices through the object. By stacking these slices together, it is possible to visualise the structure in three dimensions.
Synchrotron-generated X-ray beams provide the following advantages:
- The very high intensity of the source yields images with a high signal-to-noise ratio on short time-scales, which enables fast radiographic investigations.
- The beam can be easily monochromated. This allows correlations between attenuation values and the chemical constituents of the sample.
- The option to vary the energy of the radiation enables the investigation of objects with very different absorption coefficients within the same measuring environment.
- The high parallelism of the beam limits imaging artefacts.
- The high beam coherence can be used for phase contrast imaging and holotomography, which provide much higher image contrast.
The tomographic imaging facility at the BESSY-2 synchrotron is located at the BAMLine, a beamline dedicated to the investigation of materials and compounds, which is operated by the BAM (Bundesanstalt für Materialforschung und -prüfung). This facility is run jointly by BAM and HZB.
As well as carrying out in-house research projects, the instrument is a user facility used both by scientists from universities and scientific institutes from all over the world and by industry.
Some technical parameters (tomographic facility)
- Wave length shifter:magnetic field 7 T, characteristic energy 13.5 keV
- Double multilayer monochromator:150 W/Si-layers (d = 2.8 nm)
- Energy resolution ~10-2
- Max. photon flux density: 1012 photons/mm2/s
- X-ray energies: 6 keV - 80 keV
- Pixel size/field of view:
- 0.3 µm/1 mm
- 0.7 µm/2 mm
- 1.1 µm/4 mm
- 2.2 µm/8 mm
- 5.0 µm/20 mm
Available imaging techniques:
- Absorption contrast tomography/radiography
- Phase contrast tomography/Holotomography
- White beam tomography
Contact (see contact box right hand)
If you are considering using synchrotron tomography for your research, please contact us to discuss the feasibility of your experiments.