TY - JOUR A1 - Ewert, Uwe A1 - Redmer, Bernhard A1 - Rädel, Christoph A1 - Schnars, U. A1 - Henrich, R. A1 - Bavendiek, K. A1 - Jahn, M. T1 - Mobile computed tomography for inspection of large stationary components in nuclear and aerospace industries N2 - Mobile Tomographic Computer Aided Radiometry (TomoCAR) is based on the mechanical position control of an X-ray tube in front of an object and the application of a Digital Detector Array (DDA) behind it. Several hundred radiometric projections in small angle steps are acquired during the controlled movement of the X-ray tube along a preselected way. The tomographic or laminographic reconstruction allows the three-dimensional (3D) representation of flaws. A specially designed radiometric detector array with small internal unsharpness and high image contrast was used for visualization and sizing of planar and volumetric defects in austenitic welds in nuclear power plants. A German pilot study was successfully performed on the basis of the European network of inspection and qualification (ENIQ) guidelines. This was the precondition for several applications of TomoCAR in nuclear power stations in Germany and Switzerland. A versatile computed tomography (CT) system was developed on basis of the TomoCAR design for in situ inspection of large aircraft components under production conditions. A gate based planar computed tomograph was constructed and tested for inspection of the integrity of CFRP stringers, embedded in aircraft fibre composite shells. A probability of crack visibility >90% could be determined. KW - Computed tomography KW - X-ray KW - Welding KW - Fibre composites KW - Austenite KW - Nuclear KW - Aerospace PY - 2012 DO - https://doi.org/10.2320/matertrans.I-M2011848 SN - 1345-9678 SN - 1347-5320 VL - 53 IS - 2 SP - 308 EP - 310 PB - Japan Institute of Metals CY - Sendai AN - OPUS4-25997 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Ewert, Uwe A1 - Redmer, Bernhard A1 - Rädel, Christoph A1 - Osterloh, Kurt A1 - Schnars, U. A1 - Henrich, R. A1 - Schimmelmann, O. A1 - Bavendiek, K. A1 - Jahn, M. T1 - Mobile X-ray Inspection of light weight materials N2 - Digital detectors such as phosphor imaging plates (IP) and digital detector arrays (DDA) allow radiographic inspection with higher efficiency and improved image quality in comparison to the classic film technique. Mobile X-ray flash tubes are used routinely for veterinarian and security applications. New high sensetive IPs and DDAs enable to apply them for inspection of light materials with low X-ray attenuation as in aluminium, plastics and composites. A versatile computed tompgraphy (CT) system was developed for in situ inspection of large aircraft components under production conditions. A gate based planar computed tomograph wsa developed and testes for inspection of integrety of the stringer incorporation. Successful test trials were performed to prove the detection rate of cracks in embedded stringers. Honey comb structures of aircrafts have to be inspected for water inclusions during in-service inspections. Thermography is a powerful method for in house inspections when variations in temperature caused e. g. by sunshine can be excluded. A new X-ray diaphragm was developed for mobile back scatter measurements of large components. This method is insensitive to heat alterations in the field and thus can be applied also outdoors. T2 - International Symposium on NDT in Aerospace CY - Fürth, Germany DA - 2008-12-03 KW - X-ray light materials KW - Computertomography KW - Laminography KW - Backscatter KW - Fibre composites KW - Flash generator PY - 2008 SN - 978-3-940283-12-2 N1 - Serientitel: Berichtsband / Deutsche Gesellschaft für zerstörungsfreie Prüfung e. V. – Series title: Berichtsband / Deutsche Gesellschaft für zerstörungsfreie Prüfung e. V. IS - 114 SP - 99 EP - 111 PB - DGZfP CY - Berlin AN - OPUS4-18927 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -