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Phys Rev Lett. 2012 Apr 13;108(15):158102. Epub 2012 Apr 11.

Two-dimensional x-ray beam phase sensing.

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1
European Synchrotron Radiation Facility, BP-220, F-38043 Grenoble, France.

Abstract

We present a new method to analyze quantitatively the wave front of a partially coherent x-ray beam. The technique is based on the use of two-dimensional speckle patterns combined with digital image correlation algorithms and offers a pixel size resolution, a high accuracy, and a reduced sensitivity to mechanical vibrations thanks to a very simple setup. The requirements on transverse and longitudinal coherence are also low. Finally, we show how the method can be used for phase contrast imaging applications by a single sample exposure process.

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