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Based on Monte Carlo simulation of neutron penumbral imaging,the linear space invariance is researched. In the field of view,the points broadening linearly depends on the axial distance on the object plane,but the integrated intensity keeps linear space invariance. Using this result,the alignment precision is analyzed. The axial error of the targets center on the object plane should be controlled within 50μm. The point source should be less than 300μm away from the object plane. The aperture rotation should be within 0.1mrad.
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Keywords:
- space linear invariance /
- alignment precision /
- broadening effect /
- image distortion
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