Evaluation of Measurement Uncertainties of DVC applied to Laminography Data

Abstract : The eect of dierent data acquisition parameters on the displacement and strain uncertainties of kinematic elds is assessed via Digital Volume Correlation (DVC) applied to three-dimensional (3D) data sets imaged by synchrotron laminography. The measurement uncertainty is estimated for i) dierent materials and associated varying contrast, ii) repeated scans, i.e., uncertainty due to the imaging system and 3D reconstruction iii) rigid body motions between two subsequent scans, iv) rescaling of the gray level histogram during 32-bit oating point to 8-bit integer data conversion, v) changes in the beam properties, i.e., use of a monochromator or an undulator, and vi) changes in cam-era/detector characteristics. It is found that the amount of image contrast is not the only parameter that controls uncertainties for different materials. Further, the rigid body motion procedure should be preferred over repeated scans as it provides more conservative measurement uncertainty values. The applied 32 to 8-bit conversion procedure, beam tuning and detector characteristics hardly aect the measurement uncertainty.
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Journal of Strain Analysis for Engineering Design, SAGE Publications, A Paraître, 〈10.1177/0309324717748097〉
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Dernière modification le : jeudi 11 janvier 2018 - 06:25:46

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Ante Buljac, Thibault Taillandier-Thomas, Lukas Helfen, Thilo Morgeneyer, François Hild. Evaluation of Measurement Uncertainties of DVC applied to Laminography Data. Journal of Strain Analysis for Engineering Design, SAGE Publications, A Paraître, 〈10.1177/0309324717748097〉. 〈hal-01674568〉

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