Full-field neutron microscopy based on refractive optics

Leemreize, Hanna; Knudsen, Erik Bergbäck; Birk, Jonas Okkels; Ströbl, Markus; Detlefs, C.; Poulsen, Henning Friis

doi:10.1107/s1600576719012858

Cited by 6 publications

(4 citation statements)

References 56 publications

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“…Parts of this presentation may be relevant for other X-raydiffraction-based methods to facilitate interpretation of microstructural mapping; opportunities also exist in neutron microscopy (Leemreize et al, 2019). In particular, Bragg coherent diffraction imaging (BCDI) and the related ptychography method also probe one diffraction vector to acquire a high-resolution 3D map of the shape and internal displacements in micrometre-sized isolated particles (Chapman & Nugent, 2010;Miao et al, 2015;Pfeifer et al, 2006;Yau et al, 2017;Chamard et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

Geometrical-optics formalism to model contrast in dark-field X-ray microscopy

Poulsen¹,

Dresselhaus-Marais²,

Carlsen³

et al. 2021

J Appl Cryst

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Dark-field X-ray microscopy, DFXM, is a new full-field imaging technique that non-destructively maps the structure and local strain inside deeply embedded crystalline elements in three dimensions. In DFXM an objective lens is placed along the diffracted beam to generate a magnified projection image of the local diffracted volume. In this work, a general formalism based on geometrical optics is provided for the diffraction imaging, valid for any crystallographic space group. This allows the simulation of DFXM images based on micro-mechanical models. Example simulations are presented with the formalism, demonstrating how this may be used to design new experiments or to interpret existing ones. In particular, it is shown how modifications to the experimental design may tailor the reciprocal-space resolution function to map specific components of the deformation-gradient tensor. The formalism supports multi-length-scale experiments, as it enables DFXM to be interfaced with 3D X-ray diffraction. To illustrate the use of the formalism, DFXM images are simulated from different contrast mechanisms on the basis of the strain field around a straight dislocation.

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Section: Discussionmentioning

confidence: 99%

Geometrical-optics formalism to model contrast in dark-field X-ray microscopy

Poulsen¹,

Dresselhaus-Marais²,

Carlsen³

et al. 2021

J Appl Cryst

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“…This study has been restricted to positive defocus , since free-space propagation is utilized as the mechanism for phase contrast. However, as briefly mentioned earlier in the paper, negative defoci will be accessible if an imaging system is interposed between the sample and the detector, e.g., in possible future applications of the method of this paper to neutron microscopy [104,105] using compound refractive lenses [106,107]. For such systems, the requirement for b to be positive, so as to avoid a division-by-zero divergence in the Fourier filter given in Eq.…”

Section: -10mentioning

confidence: 95%

Revisiting Neutron Propagation-Based Phase-Contrast Imaging and Tomography: Use of Phase Retrieval to Amplify the Effective Degree of Brilliance

et al. 2023

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Propagation-based neutron phase-contrast tomography is demonstrated using the ISIS pulsed spallation source. The proof-of-concept tomogram with a Paganin-type phase-retrieval filter applied exhibits an effective net boost of 23 ± 1 in the signal-to-noise ratio as compared with an attenuation-based tomogram, implying a boost in the effective degree of neutron brilliance of over 2 orders of magnitude. This comparison is for phase retrieval versus conventional absorption with no additional collimation in place. We provide expressions for the optimal phase-contrast geometry as well as conditions for the validity of the method. The underpinning theory is derived under the assumption of the sample being composed of a single material. The effective boost in brilliance may be employed to give reduced acquisition time, or may instead be used to keep exposure times fixed while improving the measured contrast.

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“…(iv) High-resolution neutron microscopy is notoriously difficult (conventional imaging is currently limited to a resolution of about 10 μm [35]), with research being conducted into efficient scintillator materials [36] to reduce scintillator thickness (and thus increase spatial resolution) without sacrificing detected neutron flux. Neutron microscopy through compound refractive lenses is also being explored [37][38][39][40] and, while promising, does not yet provide resolutions matching conventional imaging.…”

Section: Introductionmentioning

confidence: 99%

Neutron ghost imaging

Kingston

Myers

Pelliccia³

et al. 2020

Phys. Rev. A

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Ghost imaging is demonstrated using a polyenergetic reactor source of thermal neutrons. This enables position resolution to be incorporated into a variety of neutron instruments that are not position resolving. Such a proof of concept enables several further applications. For example, in an imaging context, neutron ghost imaging can be beneficial for dose reduction and resolution enhancement. We explore the principle of resolution enhancement by employing a variant of the method in which each pixel of a position-sensitive detector is regarded as an independent bucket detector; a neutron ghost image is then computed for each pixel. We demonstrate the principle that this parallel form of neutron ghost imaging can significantly increase the spatial resolution of a pixelated detector such as a CCD or CMOS camera. Further applications and extensions of our neutron ghost-imaging protocol are discussed. These include neutron ghost tomography, neutron ghost microscopy, dark-field neutron ghost imaging, and isotope-resolved color neutron ghost imaging via prompt-gamma-ray bucket detection.

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Full-field neutron microscopy based on refractive optics

Cited by 6 publications

References 56 publications

Geometrical-optics formalism to model contrast in dark-field X-ray microscopy

Geometrical-optics formalism to model contrast in dark-field X-ray microscopy

Revisiting Neutron Propagation-Based Phase-Contrast Imaging and Tomography: Use of Phase Retrieval to Amplify the Effective Degree of Brilliance

Neutron ghost imaging

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