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

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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

View full text Add to dashboard Cite

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.

show abstract

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

View full text Add to dashboard Cite

show abstract

“…through sample-detector distance scans 5 . Therefore, this technique not only provides new understandings of the microstructural properties of materials but also offers a promising avenue for non-destructively investigating complex structures in bulk materials and assemblies subjected to external and internal stimuli, both in radiographic mode providing 2D thickness-average maps, and in tomographic mode, offering volumetric bulk insights of the studied materials 6 . Prominent examples of applications include the visualization of magnetic domains in electrical steels [7][8][9] , including time-resolved studies allowing to quantify the movement of domain walls in grain oriented electrical steels 10 .…”

Section: Introductionmentioning

confidence: 99%

Multi-directional neutron dark-field imaging with single absorption grating

Busi

Shen

Bacak

et al. 2023

Preprint

View full text Add to dashboard Cite

Neutron dark-field imaging is a powerful technique for investigating the microstructural properties of materials through high-resolution full-field mapping of small-angle scattering. However, conventional neutron dark-field imaging utilizing Talbot-Lau interferometers is limited to probing only one scattering direction at a time. Here, we introduce a novel multi-directional neutron dark-field imaging approach that utilizes a single absorption grating with a two-dimensional pattern to simultaneously probe multiple scattering directions. The method is demonstrated to successfully resolve fiber orientations in a carbon compound material as well as the complex morphology of the transformed martensitic phase in additively manufactured stainless steel dogbone samples after mechanical deformation. The latter results reveal a preferential alignment of transformed domains parallel to the load direction, which is verified by EBSD. The measured real-space correlation functions are in good agreement with those extracted from the EBSD map. Our results demonstrate that multi-directional neutron dark-field imaging is overcoming significant limitations of conventional neutron dark-field imaging in assessing complex heterogeneous anisotropic microstructures and providing quantitative structural information on multiple length scales.

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

3D sub-pixel correlation length imaging

Cited by 8 publications

References 21 publications

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

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

Multi-directional neutron dark-field imaging with single absorption grating

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

Contact Info

Product

Resources

About