CT multiscan: Using small area detectors to image large dense components

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The small size and dynamic range of the best two-dimensional X-Ray detectors are impediments in the use of three-dimensional X-Ray computed tomography (3D-XRCT) for 100% inspection of large ceramic components. The most common industrial 3D-XRCT systems use a ``rotate-only`` geometry in which the X-Ray source and the area detector remain stationary while the component placed between them is rotated through 360{degrees}. This configuration offes the highest inspection speed and the best utilization of X-Ray dose, but requires that the component be small enough to fit within the X-Ray/detector ``cone.`` Also, if the object is very dense, the ratio of an ... continued below

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26 p.

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Sivers, E.A.; Ellingson, W.A.; Snyder, S.A. & Holloway, D.A. November 1, 1994.

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Description

The small size and dynamic range of the best two-dimensional X-Ray detectors are impediments in the use of three-dimensional X-Ray computed tomography (3D-XRCT) for 100% inspection of large ceramic components. The most common industrial 3D-XRCT systems use a ``rotate-only`` geometry in which the X-Ray source and the area detector remain stationary while the component placed between them is rotated through 360{degrees}. This configuration offes the highest inspection speed and the best utilization of X-Ray dose, but requires that the component be small enough to fit within the X-Ray/detector ``cone.`` Also, if the object is very dense, the ratio of an unattenuated X-Ray signal to that through the longest path in the component may exceed the dynamic range of the detector. To some extent, both of these disadvantages can be overcome by using ``Multi-scan CT,`` i.e. scanning small overlapping regions of a large component separately while maximizing the X-Ray dose to each. The overlapping scans can then be combined seamlessly into a single scan with optimal contrast.

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26 p.

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OSTI as DE95013707

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  • 40. International gas turbine and aeroengine congress and exposition, Houston, TX (United States), 5-8 Jun 1995

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  • Other: DE95013707
  • Report No.: ANL/ET/CP--84247
  • Report No.: CONF-950629--8
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 100208
  • Archival Resource Key: ark:/67531/metadc623350

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  • November 1, 1994

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • Dec. 16, 2015, 12:14 p.m.

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Sivers, E.A.; Ellingson, W.A.; Snyder, S.A. & Holloway, D.A. CT multiscan: Using small area detectors to image large dense components, article, November 1, 1994; Illinois. (digital.library.unt.edu/ark:/67531/metadc623350/: accessed December 11, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.