Materials Transactions Online

Materials Transactions, Vol.53 No.02 (2012) pp.308-310
© 2012 The Japanese Society for Non-Destructive Inspection

Mobile Computed Tomography for Inspection of Large Stationary Components in Nuclear and Aerospace Industries

Uwe Ewert1, Bernhard Redmer1, Christoph Rädel1, Ulf Schnars2, Rudolf Henrich2, Klaus Bavendiek3 and Mirko Jahn3

1BAM, Berlin, Germany
2Airbus, Bremen, Germany
3YXLON International GmbH, Hamburg, Germany

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.

(Received 2009/11/10; Accepted 2011/10/29; Published 2012/01/25)

Keywords: computed tomography, X-ray, welding, fibre composites, austenite, nuclear, aerospace

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REFERENCES

  1. U. Ewert, J. Robbel, C. Bellon, A. Schumm and C. Nockemann: Materialforschung 37 (1995) 218-222.
  2. B. Redmer, J. Robbel, U. Ewert and V. Vengrinovich: Insight 44 (2002) 564-567.
  3. B. Redmer, U. Ewert, B. Neundorf and M. Jakob: 9th ECNDT, 25-29 Sept. 2006, Berlin, Germany, http://www.ndt.net/article/ecndt2006/doc/We.3.2.3.pdf.
  4. X-ray tube design: RTW RÖNTGEN-TECHNIK DR. WARRIKHOFF KG, http://www.rtwxray.de/index.php?id=oemdesigns.
  5. Detector design: Oy AJAT Ltd, Technical description of DIC100T, DIC50T and DIC25T, http://www.ajat.fi/products_dic.php.


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