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Article Dans Une Revue JOURNAL OF APPLIED CRYSTALLOGRAPHY Année : 2023

Implementation of grain mapping by diffraction contrast tomography on a conventional laboratory tomography setup with various detectors

Résumé

Lab-based diffraction contrast tomography (LabDCT) is a novel technique to resolve grain orientations and shapes in 3D at the micron scale using laboratory X-ray sources, lifting out the constraint of limited access to synchrotron facilities. To foster the development of this technique, detailed implementation of LabDCT is illustrated on a conventional lab-based X-ray tomography setup and it is shown that such implementation is possible with the two most common types of detectors-CCD and flat panel. As a benchmark, LabDCT projections were acquired on an AlCu alloy sample using the two types of detectors at different exposure times. Grain maps were subsequently reconstructed using the opensourced grain reconstruction method as reported in our previous work. To characterize the detection limit and the spatial resolution for the current implementation, the reconstructed LabDCT grain maps were compared with the one obtained from a synchrotron measurement, which is considered as ground truth. Results show that the final grain maps from measurements of the CCD and flat panel detector are similar and show comparable quality, whilst the CCD gives a much better contrast-to-noise ratio than the flat panel. The analysis of grains maps reconstructed from measurements with different exposure time suggests that a grain map of comparable quality could have been obtained in less than one hour total acquisition time without a significant loss of grain reconstruction quality and indicates a clear potential for time-lapse LabDCT experiments. The current implementation is suggested to promote the generic use of LabDCT technique for grain mapping on conventional tomography setups.
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Dates et versions

hal-04305375 , version 1 (24-11-2023)

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Haixing Fang, Wolfgang Ludwig, Pierre Lhuissier. Implementation of grain mapping by diffraction contrast tomography on a conventional laboratory tomography setup with various detectors. JOURNAL OF APPLIED CRYSTALLOGRAPHY, 2023, 56, pp.810-824. ⟨10.1107/S1600576723003874⟩. ⟨hal-04305375⟩
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