Patent ID: 9207194
Filing Date: 2015-12-08
Classification: G01N,G21K

Abstract:
1. Apparatus for two-dimensional neutron imaging of a sample comprising: a beam coherence generator on which a neutron beam is incident and which transmits a substantially coherent neutron beam therethrough; a two-dimensional structure with periodic features in a pair of transverse orthogonal dimensions spaced from the beam coherence generator, wherein a sample can be positioned between the beam coherence generator and the structure so that the coherent beam from the beam coherence generator passes through the sample and the resulting encoded beam is incident on the structure, wherein the two-dimensional structure is a two-dimensional Hartmann amplitude mask or phase screen as embodied by a two-dimensional array of zone plates, multilayer off-axis mirrors or refractive lenses; and a neutron detector positioned after the two-dimensional structure to detect both phase shift and absorption of neutrons passing through the sample.