TY - JOUR A1 - LaCivita, K. A1 - Ewert, Uwe T1 - ÊPS-approach -Equivalent penetrameter sensitivity as applied to computed radiography KW - ZfP KW - Radiographie KW - Bildqualität KW - Speicherfolien PY - 2012 SN - 0025-5327 VL - 70 IS - 8 SP - 925 EP - 930 PB - Society for Nondestructive Testing CY - Columbus, Ohio AN - OPUS4-26698 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Müller, Christina A1 - Ewert, Uwe A1 - Pavlovic, Mato A1 - Scharmach, Katrin A1 - Ronneteg, U. A1 - Ryden, H. T1 - Zuverlässigkeit von ZfP-Verfahren zur Gewährleistung der Integrität von Cu-Schweißnähten zur sicheren Endlagerung radioaktiver Abfälle KW - Zerstörungsfreie Prüfung KW - Zuverlässigkeit KW - POD PY - 2007 SN - 978-3-931381-98-1 SP - 1 EP - 18 (Vortrag 44) PB - DGZfP CY - Berlin AN - OPUS4-16007 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Ewert, Uwe A1 - Zscherpel, Uwe A1 - Heyne, Klara A1 - Redmer, Bernhard A1 - Jechow, Mirko T1 - Zum Zusammenhang von Grauwerten und dem normierten und unnormierten Signal/Rausch-Verhältnis in der Digitalen Radiographie - die neue Standart-Prozedur nach ISO/DIS 17636-2 und prEN 14784-2 T2 - DGZfP-Jahrestagung 2011 CY - Bremen, Germany DA - 2011-05-30 PY - 2011 AN - OPUS4-26667 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Beckmann, Jörg A1 - Fratzscher, Daniel A1 - von Chrzanowski, Lars A1 - Ewert, Uwe T1 - Zeitaufgelöste THz-Spektroskopie für technische und zivile Sicherheitsanwendungen N2 - Vortrag über Zeitaufgelöste THz-Spektroskopie für technische und zivile Sicherheitsanwendungen T2 - DACH-Jahrestagung 2012 CY - Graz, Austria DA - 17.09.2012 KW - THz Spektroskopie KW - Technische und zivile Sicherheit PY - 2012 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:b43-280013 SN - 978-3-940283-44-3 IS - DGZfP-BB 136 SP - Mi.1.C.4, 1 EP - 14 PB - Deutsche Gesellschaft für Zerstörungsfreie Prüfung e.V. (DGZfP) AN - OPUS4-28001 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Ewert, Uwe A1 - Redmer, Benrhard A1 - Schumacher, David A1 - Thiessenhusen, Kai-Uwe A1 - Bellon, Carsten A1 - Nicholson, P. I. A1 - Clarke, A. L. A1 - Finke-Härkönen, K.-P. T1 - X-ray tomographic in-service inspection of girth welds – the european project tomoweld N2 - The new standard ‘ISO 17636-2:2013: Non-destructive testing of welds — Radiographic testing — Part 2: X- and gamma-ray techniques with digital detectors’, defines the practice for radiographic inspection of welded pipes for manufacturing and in-service inspection. It is applied in Europe for inspections of pipe welds in nuclear power plants as well as in chemical plants and allows a faster inspection with digital detector arrays (DDA) than with film. Nevertheless, it does not allow the evaluation of the depth and shape of volumetric and planar indications. In 2001 a planar tomography scanner, TomoCAR, was introduced for mechanized radiographic testing (RT) inspection and non-destructive measurement of cross sections. The project TomoWELD is based on a new concept of the scan geometry, an enhanced GPU based reconstruction, and the application of a new generation of photon counting DDAs based on CdTe crystal CMOS hybrids. The new detector permits the selection of energy thresholds to obtain an optimum energy range and reduction of the influence of scattered radiation. The concept and first measurements are presented. Flaw depth and shape of volumetric and planar irregularities can be determined. T2 - QNDE 2014 CY - Boise, Idaho, USA DA - 20.07.2014 KW - X-ray imaging KW - Tomography KW - Engineering inspection KW - Radiography KW - Welded joints KW - Chemical plants PY - 2015 SN - 978-0-7354-1292-7 U6 - https://doi.org/10.1063/1.4914650 SN - 0094-243X N1 - Geburtsname von Schumacher, David: Walter, D. - Birth name of Schumacher, David: Walter, D. VL - 1650 SP - 525 EP - 533 PB - American Institute of Physics AN - OPUS4-36581 LA - eng 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 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 U6 - 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 - TY - JOUR A1 - Osterloh, Kurt A1 - Zscherpel, Uwe A1 - Ewert, Uwe T1 - X-ray backscatter radioscopy for security applications with a novel twisted slit collimator KW - Röntgenrückstreuung KW - Kamera für hochenergetische Strahlung PY - 2009 SN - 1619-2486 IS - 10 SP - 22 EP - 25 PB - ddp Goldenbogen CY - Dresden AN - OPUS4-20711 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Osterloh, Kurt A1 - Zscherpel, Uwe A1 - Ewert, Uwe T1 - Visualisation of radioactive materials and backscatter radiography with a novel collimation based camera system T2 - 4th Security research conference Karlsruhe CY - Karlsruhe, Germany DA - 2009-09-29 KW - Kamera für hochenergetische Strahlung KW - Bildliche Wiedergabe der Formen von Strahlenquellen KW - Röntgenrückstreustrahlung KW - Anwendung für die öffentliche Sicherheit (Security) PY - 2009 IS - #052 SP - 1 EP - 8 AN - OPUS4-20712 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Osterloh, Kurt A1 - Ewert, Uwe T1 - Visual perception of spatial subjects T2 - DIR 2007 - International Symposium on Digital industrial Radiology and Computed Tomography CY - Lyon, France DA - 2007-06-25 KW - Image (data) processing KW - Image interpretation KW - Physiological capabilities and constraints KW - Visibility of certain features KW - Perception of a subject PY - 2007 SP - 1 EP - 8 CY - Lyon, France AN - OPUS4-20713 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Ewert, Uwe A1 - Zscherpel, Uwe A1 - Vogel, Justus A1 - Zhang, F. A1 - Long, N.X. A1 - Nguyen, T.P. T1 - Visibility of Image Quality Indicators (IQI) by Human Observers in Digital Radiography in Dependence on Measured MTFs and Noise Power Spectra N2 - Digital radiographic images were analysed to predict the visibility of image quality indicators (IQI), based on normalized noise power spectra (NNPP) and modulation transfer function (MTF) measurements. The fixed pattern noise of some digital detectors result in different noise spectra, which influence the visibility of different IQIs, depending on the hole diameter. Studies, based on measurement of basic spatial resolution and contrast to noise ratio were performed together with presampled MTF measurements and the NNPS in dependence on the spatial frequency. Plate hole IQIs, step hole IQIs, and equivalent penetrameter sensitivity (EPS) IQIs based on ASTM E 746 were measured to verify the influence of the different parameters. Modelling of digital images was used to verify the applied numeric tools. A study has been performed for imaging plates and digital detector arrays to analyse differences. Formulas for the prediction of the visibility functions for hole type IQIs are derived. In consequence the standards for characterization and classification of computed radiography (ASTM E 2446) and radiography with DDAs (ASTM E 2597) need to be revised. T2 - 12th ECNDT 2018 CY - Gothenburg, Sweden DA - 11.06.2018 KW - Image evaluation KW - Computed radiography (CR) KW - Digital Detector Array (DDA) KW - Detail detection PY - 2018 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:b43-473486 UR - www.ndt.net/?id=22967 SN - 1435-4934 VL - 23 IS - 8 SP - 1 EP - 7 PB - NDT.net CY - Kirchwald AN - OPUS4-47348 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -