TY - CONF A1 - Kardjilov, N. A1 - Hilger, A. A1 - Manke, I. A1 - Banhart, J. A1 - Griesche, Axel T1 - Imaging with Cold Neutrons at the CONRAD-2 Facility N2 - CONRAD-2 is an imaging instrument using low-energy (cold) neutrons. The instrument is installed at the end of a curved neutron guide which avoids the direct line of sight towards the reactor core. This ensures a very low background of high-energy neutrons and. photons at the sample position. The cold neutron beam provides a wavelength range which is suitable for phase-and diffraction-contrast imaging such as grating interferometry and Bragg edge mapping. The instrument is well suited for high resolution imaging due to the high efficiency of the very thin scintillators that can be used for the detection of cold neutrons. An instrument upgrade was performed recently as a part of an upgrade program for the cold neutron instrumentation at HZB. The parameters of the instrument as well as some research highlights will be presented. T2 - 10th World Conference on Neutron Radiography (WCNR) CY - Grindelwald, SWITZERLAND DA - 05.10.2014 KW - iron embrittlement KW - neutron imaging KW - neutron instrumentation KW - cold neutrons PY - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:b43-373239 SN - 1875-3892 VL - 69 SP - 60 EP - 66 PB - Elsevier B.V. CY - Amsterdam, NL AN - OPUS4-37323 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Tran, K. V. A1 - Woracek, R. A1 - Kardjilov, N. A1 - Markötter, Henning A1 - Hilger, A. A1 - Kockelmann, W. A1 - Kelleher, J. A1 - Puplampu, S. B. A1 - Penumadu, D. A1 - Tremsin, A. S. A1 - Banhart, J. A1 - Manke, I. T1 - Spectral neutron tomography N2 - Combined three-dimensional (3D) mapping of (micro-)structures with elemental and crystalline phase variations is of significant importance for the characterization of materials. Neutron wavelength selective imaging is a spectral imaging technique that exploits unique contrast differences e.g. for mapping dissimilar elemental, isotope, or phase compositions, and has the particular advantage of being applicable to sample volumes on the meso- and macroscale. While being mostly applied as radiography (2D) so far, we herein report that the extension to tomography allows for the display of the full spectral information for every voxel and in 3D. The development is supported by example data from a continuous as well as a pulsed neutron source. As a practical example, we collected 4D data sets (3D + spectral) of plastically deformed metastable stainless steel and herein demonstrate an improved quantification strategy for crystalline phase fractions. These exemplary results illustrate that localized phase transformations can be quantified even in complex geometries within centimeter-sized samples, and we will discuss the limits and future prospects of the technique that is not limited to crystalline materials. KW - 4D tomographic data KW - Multi-energy CT KW - Spectral CT KW - Phase distribution KW - Full-field phase tomography PY - 2021 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:b43-521668 VL - 9 SP - 132 PB - Elsevier Ltd. AN - OPUS4-52166 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -