期刊
MEASUREMENT SCIENCE AND TECHNOLOGY
卷 29, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1361-6501/aa9818
关键词
x-ray computed tomography; online calibration; artifact correction; digital volume correlation; proper generalized decomposition (PGD)
资金
- French 'Agence Nationale de la Recherche' [ANR-10-EQPX-37 MATMECA]
- COMINSIDE [ANR-14-CE07-0034-02]
An online calibration procedure for x-ray lab-CT is developed using projection-based digital volume correlation. An initial reconstruction of the sample is positioned in the 3D space for every angle so that its projection matches the initial one. This procedure allows a space-time displacement field to be estimated for the scanned sample, which is regularized with (i) rigid body motions in space and (ii) modal time shape functions computed using model reduction techniques (i.e. proper generalized decomposition). The result is an accurate identification of the position of the sample adapted for each angle, which may deviate from the desired perfect rotation required for standard reconstructions. An application of this procedure to a 4D in situ mechanical test is shown. The proposed correction leads to a much improved tomographic reconstruction quality.
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