1 code implementation • 4 Aug 2020 • Siddharth Maddali, Marc Allain, Peng Li, Virginie Chamard, Stephan O. Hruszkewycz
This paper addresses three-dimensional signal distortion and image reconstruction issues in x-ray Bragg coherent diffraction imaging (BCDI) in the event of a non-trivial, non-orthogonal orientation of the area detector with respect to the diffracted beam.
Instrumentation and Detectors Image and Video Processing
1 code implementation • 15 Aug 2019 • Peng Li, Siddharth Maddali, Anastasios Pateras, Irene Calvo-Almazan, Stephan O. Hruszkewycz, Virginie Chamard, Marc Allain
To deal with this, the currently favored approach (detailed in Part I) is to perform the entire inversion in conjugate non-orthogonal real and Fourier space frames, and to transform the 3D sample image into an orthogonal frame as a post-processing step for result analysis.
Instrumentation and Detectors Signal Processing
1 code implementation • 15 Aug 2019 • Siddharth Maddali, Peng Li, Anastasios Pateras, Daniel Timbie, Nazar Delegan, Alex Crook, Hope Lee, Irene Calvo-Almazan, Dina Sheyfer, Wonsuk Cha, F. Joseph Heremans, David D. Awschalom, Virginie Chamard, Marc Allain, Stephan O. Hruszkewycz
Part II builds upon the geometric theory developed in Part I with the formalism to correct the shear distortions directly on an orthogonal grid within the phase retrieval algorithm itself, allowing more physically realistic constraints to be applied.
Instrumentation and Detectors
1 code implementation • 28 Mar 2019 • Siddharth Maddali, Jun-Sang Park, Hemant Sharma, Sarvjit Shastri, Peter Kenesei, Jonathan Almer, Ross Harder, Matthew J. Highland, Youssef S. G. Nashed, Stephan O. Hruszkewycz
We present proof-of-concept imaging measurements of a polycrystalline material that integrate the elements of conventional high-energy X-ray diffraction microscopy with coherent diffraction imaging techniques, and that can enable in-situ strain-sensitive imaging of lattice structure in ensembles of deeply embedded crystals over five decades of length scale upon full realization.
Materials Science Applied Physics
