Single-exposure elemental differentiation and texture-sensitive phase-retrieval imaging with a neutron counting micro-channel plate detector
arxiv(2023)
Abstract
Micro-channel plate (MCP) detectors, when used at pulsed-neutron-source
instruments, offer the possibility of high spatial resolution and high contrast
imaging with pixel-level spectroscopic information. Here we demonstrate the
possibility of multimodal analysis including total neutron cross-section
spectra measurements, quantitative material differentiation imaging and
texture-sensitive in-line phase imaging, from a single exposure using an MCP
detector. This multimodal approach operates in full-field imaging mode, with
the neutron transmission spectra acquired at each individual detector pixel.
Due to the polychromatic nature of the beam and spectroscopic resolving
capability of the detector, no energy scanning is required. Good agreement with
the library reference data is demonstrated for neutron cross-section spectra
measurements. Two different images corresponding to two selected energy
bandwidths are used for elemental differentiation imaging. Moreover, the
presence of changes in texture, i.e., preferred grain orientation, in the
sample is identified from our phase-retrieval imaging results.
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