TY - JOUR A1 - Osterloh, Kurt A1 - Rädel, Christoph A1 - Zscherpel, Uwe A1 - Meinel, Dietmar A1 - Ewert, Uwe A1 - Buecherl, T. A1 - Hasenstab, A. T1 - Fast neutron radiography and tomography of wood JF - Insight N2 - Wood is the material that has accompanied the whole development of mankind in various applications, for manufacturing tools and weapons, for buildings and constructions and also as fuel. It has various appearances and is subjected to decomposing changes, so there are sufficient arguments for non-destructive testing of wooden objects in the same way as is common practice with other technologically used materials. However, even today wood is rarely tested. Moreover, artefacts of cultural heritage containing wood are rare and delicate, so dismantling these for studying purposes is undesirable. Radiological inspection technologies are the methods of choice to provide a non-destructive insight. Interrogations of a specimen with various kinds of radiation provide different answers about their internal structures. High-quality detailed images are achievable with X-rays or gamma radiation in cases where heavy metals or other dense materials are not involved. Neutrons behave complementarily; they are avidly absorbed by light elements such as hydrogen on the one hand and yet are capable of easily penetrating heavy metals on the other. This provides an alternative for X-ray radiography and tomography when material characteristics are of primary interest rather than structural details, or when shielding with plates or sleeves of heavy metal severely impedes inspections with X-ray or gamma radiation technologies. However, due to the moderating effect of wooden samples it is essential to use fast neutrons for radiography and tomography of voluminous objects. Some typical examples described here will show the difference between neutron and X-ray photon-based radiographic technologies. KW - Materialgeschichtliches KW - Vergleich zwischen Röntgen- und Neutronenradiographie PY - 2008 DO - https://doi.org/10.1784/insi.2008.50.6.307 SN - 0007-1137 VL - 50 IS - 6 SP - 307 EP - 311 PB - British Institute of Non-Destructive Testing CY - Northampton AN - OPUS4-18034 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Osterloh, Kurt A1 - Hasenstab, Andreas A1 - Zscherpel, Uwe A1 - Alekseychuk, Oleksandr A1 - Meinel, Dietmar A1 - Goebbels, Jürgen A1 - Ewert, Uwe T1 - Radiographic and Tomographic Testing of Wood T2 - 9th European Conference on NDT T2 - 9th European Conference on NDT CY - Berlin, Germany DA - 2006-09-25 KW - NDT of wood KW - Naturally grown material with individual structuring KW - Loss of integrity due to biological decay (rot) KW - CT KW - DR KW - IP PY - 2006 SN - 3-931381-86-2 SP - 1(?) EP - 10(?) PB - European Federation for Non-Destructive Testing CY - Berlin AN - OPUS4-14170 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Osterloh, Kurt A1 - Zscherpel, Uwe A1 - Rädel, Christoph A1 - Weidemann, Gerd A1 - Meinel, Dietmar A1 - Goebbels, Jürgen A1 - Ewert, Uwe A1 - Hasenstab, A. A1 - Bücherl, T. T1 - Durchstrahlungsprüfung von Holz T2 - DGZfP-Jahrestagung 2007 T2 - DGZfP-Jahrestagung 2007 CY - Fürth, Deutschland DA - 2007-05-14 KW - Digitale Radiographie KW - Tomographie KW - Spaltneutronen KW - Neutronenradiographie PY - 2007 SN - 978-3-931381-98-1 IS - DGZfP-BB 104 (Vortrag 40) SP - 1 EP - 12 AN - OPUS4-20717 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Silva, W. A1 - Lopes, R. A1 - Zscherpel, Uwe A1 - Meinel, Dietmar A1 - Ewert, Uwe T1 - X-ray imaging techniques for inspection of composite pipelines JF - Micron N2 - The literature has shown that the application of laminography provides advantages as 3D radiographic imaging with depth information for in house and mobile testing. This permits to distinguish between overlapping indications, measure the extension along radiation direction and classify indications as surface open or subsurface ones as required in critical engineering assessment. This work provides a comparative study and measurements of the three techniques Digital Radiography (DR) with Digital Detector Arrays (DDA), Coplanar Translational Laminography (CTL) and Computed Tomography (CT), applied for composite pipeline inspection. It is demonstrated that CTL and CT provide advantages for the evaluation of pipe-to-pipe connections and the evaluation of adhesive applications. They show indications of discontinuities with higher contrast sensitivity than radiography. Beyond it, two specimen, namely Phantom 1 and Phantom 2, were developed and manufactured by additive manufacturing to analyze the preferential detection sensitivity and the direction of features and depth information for laminographic measurements. Another goal was to show the laminographic capabilities to distinguish between overlapping discontinuities. CTL is especially suitable for mobile inspection. Special glass fiber reinforced polymer samples (GRP) were manufactured for further analysis and comparisons between the abovementioned techniques. Finally, Phantoms 1 and 2 show the capability of laminography to detect overlapping indications and also show that discontinuities oriented perpendicular to the scan direction have the highest contrast sensitivity for laminographic measurements. KW - Digital Radiography KW - Laminography KW - Computed Tomography KW - Composite Pipes KW - Image Quality PY - 2021 DO - https://doi.org/10.1016/j.micron.2021.103033 SN - 0968-4328 VL - 145 SP - 103033 PB - Elsevier Ltd. AN - OPUS4-52415 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -