PHASE-SENSITIVE TWO-DIMENSIONAL NEUTRON SHEARING INTERFEROMETER AND HARTMANN SENSOR

摘要

A neutron imaging system detects both the phase shift and absorption of neutrons passing through an object. The neutron imaging system is based on either of two different neutron wavefront sensor techniques: 2-D shearing interferometry and Hartmann wavefront sensing. Both approaches measure an entire two-dimensional neutron complex field, including its amplitude and phase. Each measures the full-field, two-dimensional phase gradients and, concomitantly, the two-dimensional amplitude mapping, requiring only a single measurement.

主权项

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; and a neutron detector positioned after the two-dimensional structure to detect both phase shift and absorption of neutrons passing through the sample.