Dark-field hyperspectral X-ray imaging

Christopher K. Egan, Simon D. M. Jacques, Thomas Connolley, Matthew D. Wilson, Matthew C. Veale, Paul Seller, Robert J. Cernik

Abstract

In recent times, there has been a drive to develop non-destructive X-ray imaging techniques that provide chemical or physical insight. To date, these methods have generally been limited; either requiring raster scanning of pencil beams, using narrow bandwidth radiation and/or limited to small samples. We have developed a novel full-field radiographic imaging technique that enables the entire physio-chemical state of an object to be imaged in a single snapshot. The method is sensitive to emitted and scattered radiation, using a spectral imaging detector and polychromatic hard X-radiation, making it particularly useful for studying large dense samples for materials science and engineering applications. The method and its extension to three-dimensional imaging is validated with a series of test objects and demonstrated to directly image the crystallographic preferred orientation and formed precipitates across an aluminium alloy friction stir weld section.

  • Received September 23, 2013.
  • Accepted January 23, 2014.
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