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Fabrication and characterization of the source grating for visibility improvement of neutron phase imaging with gratings
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10.1063/1.4810014
/content/aip/journal/rsi/84/6/10.1063/1.4810014
http://aip.metastore.ingenta.com/content/aip/journal/rsi/84/6/10.1063/1.4810014

Figures

Image of FIG. 1.
FIG. 1.

Schematic of a neutron grating interferometer.

Image of FIG. 2.
FIG. 2.

Fabrication process of new source grating: (a) photoresist material coating, (b) UV exposure and development, (c) deep reactive ion etching, (d) fabricated silicon structure, (e) pouring Gadox mixture, (f) precipitation of Gadox particles in vacuum chamber, (g) removing of remained Gadox particles, and (h) solidification in an oven.

Image of FIG. 3.
FIG. 3.

(a) A source grating fabricated by the Gadox filling method and (b) a source grating fabricated by the Gd deposition method.

Image of FIG. 4.
FIG. 4.

(a) An optical microscopy image of the fabricated silicon grating surface, (b) SEM images of the grating surface, and (c) SEM images of the grating cross section.

Image of FIG. 5.
FIG. 5.

The neutron transmission images: (a) a conventional source grating with a 5 m height, (b) a conventional source grating with a 10 m height, (c) the new source grating, and (d) a line profile of the projection images.

Image of FIG. 6.
FIG. 6.

Neutron grating interferometer setup at ENF: (a) overview of the inside ENF, (b) the source grating G0 and motorized stage, and (c) the phase grating G1, the analyzer grating G2, the lens coupled detector with a scintillation screen, and the motorized stage.

Image of FIG. 7.
FIG. 7.

Measured pixel values by phase stepping and sine fitting curve.

Image of FIG. 8.
FIG. 8.

The optimization of visibility by changing the G1-G2 distance.

Image of FIG. 9.
FIG. 9.

(a) A dark-field image with the new source grating and a 5 cm Beryllium filter of the FeSi sample, and (b) a dark-field image with the new source grating and a 10 cm Beryllium filter of the FeSi sample.

Tables

Generic image for table
Table I.

Parameters of the designed grating interferometer setup at ENF.

Generic image for table
Table II.

G0 grating test conditions and visibilities.

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/content/aip/journal/rsi/84/6/10.1063/1.4810014
2013-06-27
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Fabrication and characterization of the source grating for visibility improvement of neutron phase imaging with gratings
http://aip.metastore.ingenta.com/content/aip/journal/rsi/84/6/10.1063/1.4810014
10.1063/1.4810014
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