3D sub-pixel correlation length imaging

Harti, Ralph P.; Ströbl, Markus; Valsecchi, Jacopo; Hovind, Jan; Grünzweig, C.

doi:10.1038/s41598-020-57988-7

Cited by 8 publications

(7 citation statements)

References 21 publications

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“…Up to this point, we have only discussed the simulation of darkfield imaging data in the context of two-dimensional or radiography measurements. However, dark-field imaging can be extended to three-dimensional space via tomography as described by Harti et al (2020). The signal from microstructures contained per voxel will need to be balanced with the overall transmission through our material and the integration over multiple microstructures across the beam path rather than the single structures discussed above.…”

Section: Discussionmentioning

confidence: 99%

Simulation of neutron dark-field data for grating-based interferometers

Wolf,

Kim,

Kienzle

et al. 2024

J Appl Crystallogr

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Hierarchical structures and heterogeneous materials are found in many natural and engineered systems including additive manufacturing, alternative energy, biology and polymer science. Though the structure–function relationship is important for developing more advanced materials, structural characterization over broad length scales often requires multiple complementary measurements. Neutron far-field interferometry aims to enable multi-scale characterization by combining the best of neutron imaging with small-angle neutron scattering (SANS) via dark-field imaging. The microstructure, nominally from 1 nm to 10 µm, is averaged over each volume element ∼(50 µm)3 in the sample, resulting in a `tomographic SANS' measurement. Unlike in small-angle scattering, there are few analytical models to fit dark-field imaging data to extract properties of the microstructure. Fortunately, the dark field and SANS are related through a single Hankel transform. In this work, we discuss the development of a Python-based library, correlogram-tools, that makes use of existing small-angle scattering models and a numerical implementation of the Hankel transform to simulate dark-field interferometry data. We demonstrate how this software can be used to inform researchers of viable sample sets for interferometry experiments, analyze interferometry data, and simulate raw and reconstructed interferometry images for the training of more advanced segmentation models and analysis protocols.

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Section: Discussionmentioning

confidence: 99%

Simulation of neutron dark-field data for grating-based interferometers

Wolf,

Kim,

Kienzle

et al. 2024

J Appl Crystallogr

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“…It has already been shown that DFI can detect sub-resolution features qualitatively 19,26,40,28,[33][34][35][36][37][38][39] , but until now, methods demonstrating quantification of the size of the unresolved porosity have not been presented in published research. In this research, we present a method to estimate the size of the unresolved pores in a material, based tunable grating interferometry performed at the TOMCAT beamline of the Swiss Light Source (Paul Scherrer Institut).…”

Section: Proposed Methodsmentioning

confidence: 99%

Tunable X-ray dark-field imaging for sub-resolution feature size quantification in porous media

Blykers

Organista

Boone

et al. 2021

Preprint

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X-ray computed micro-tomography typically involves a trade-off between sample size and resolution, complicating the study at a micrometer scale of representative volumes of materials with broad feature size distributions (e.g. natural stones). X-ray dark-field tomography exploits scattering to probe sub-resolution features, promising to overcome this trade-off. In this work, we present a quantification method for sub-resolution feature sizes using dark-field tomograms obtained by tuning the autocorrelation length of a Talbot grating interferometer. Alumina particles with different nominal pore sizes (50 nm and 150 nm) were mixed and imaged at the TOMCAT beamline of the SLS synchrotron (PSI) at eighteen correlation lengths, covering the pore size range. The different particles cannot be distinguished by traditional absorption µCT due to their very similar density and the pores being unresolved at typical image resolutions. Nevertheless, by exploiting the scattering behavior of the samples, the proposed analysis method allowed to quantify the nominal pore sizes of individual particles. The robustness of this quantification was proven by reproducing the experiment with solid samples of alumina, and alumina particles that were kept separated. Our findings demonstrate the possibility to calibrate dark-field image analysis to quantify sub-resolution feature sizes, allowing multi-scale analyses of heterogeneous materials without subsampling.

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“…In dark-field imaging, the ACL is a system parameter of a nTLI that is related to the wavelength of the neutron beam, period of the analyzer grating, and distance between the sample and analyzer grating 9 . Dark-field imaging using a conventional nTLI 13 , 14 has an ACL of several micrometers, meaning it can only analyze sample inhomogeneities in the micrometer range, unlike the conventional range of SANS which is of order nanometers. Therefore, different geometries are required to extend the ACL range to apply dark-field imaging to material studies that have traditionally been conducted using conventional SANS instruments.…”

Section: Introductionmentioning

confidence: 99%

Analysis of a silicon comb structure using an inverse Talbot–Lau neutron grating interferometer

Kim

Hussey

et al. 2022

Sci Rep

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We describe an inverse Talbot–Lau neutron grating interferometer that provides an extended autocorrelation length range for quantitative dark-field imaging. To our knowledge, this is the first report of a Talbot–Lau neutron grating interferometer (nTLI) with inverse geometry. We demonstrate a range of autocorrelation lengths (ACL) starting at low tens of nanometers, which is significantly extended compared to the ranges of conventional and symmetric setups. ACLs from a minimum of 44 nm to the maximum of 3.5 μm were presented for the designed wavelength of 4.4 Å in experiments. Additionally, the inverse nTLI has neutron-absorbing gratings with an optically thick gadolinium oxysulfide (Gadox) structure, allowing it to provide a visibility of up to 52% while maintaining a large field of view of approximately 100 mm × 100 mm. We demonstrate the application of our interferometer to quantitative dark-field imaging by using diluted polystyrene particles in an aqueous solution and silicon comb structures. We obtain quantitative structural information of the sphere size and concentration of diluted polystyrene particles and the period, height, and duty cycle of the silicon comb structures. The optically thick Gadox structure of the analyzer grating also provides improved characteristics for the correction of incoherent neutron scattering in an aqueous solution compared to the symmetric nTLI.

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3D sub-pixel correlation length imaging

Cited by 8 publications

References 21 publications

Simulation of neutron dark-field data for grating-based interferometers

Simulation of neutron dark-field data for grating-based interferometers

Tunable X-ray dark-field imaging for sub-resolution feature size quantification in porous media

Analysis of a silicon comb structure using an inverse Talbot–Lau neutron grating interferometer

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