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- W2796019785 abstract "We propose a new approach for reconstructing the 3D spatial distribution of small dislocation loops (DLs) from 2D TEM micrographs. This method is demonstrated for small DLs in tungsten, formed by low-dose ion-implantation, that appear as circular spots in diffraction contrast images. To extract the 3D position of specific DLs, their 2D position in multiple weak-beam dark-field TEM micrographs, recorded at different tilt angles, is fitted. From this fit the geometric centre and size of each DL in each micrograph can be extracted. Using a forward prediction approach each specific DL is identified in all the 2D projections. A system of linear equations can then be setup, linking the 3D position of each DL to its 2D position in each projection. If more than 2 projections are available this system of equations is over-determined, and the 3D position of each DL is found by least-squares fitting. The results are in good agreement with the damage microstructure recovered using a generalized weighted back-projection method. Importantly the triangulation approach requires fewer projections and is less sensitive to the angular range covered by the projections. Our new method is also less sensitive to contrast variations due to local deviations from the diffraction condition. These advantages, as well as the accuracy of the triangulation method, are discussed in detail." @default.
- W2796019785 created "2018-04-13" @default.
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- W2796019785 date "2018-04-03" @default.
- W2796019785 modified "2023-09-27" @default.
- W2796019785 title "3D reconstruction of the spatial distribution of dislocation loops using a triangulation approach" @default.
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