Hardware

Toda, Hiroyuki

doi:10.1007/978-981-16-0590-1_4

Cited by 5 publications

(20 citation statements)

References 43 publications

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“…Additionally, the energy spectrum can usually be tuned to achieve monochromatic conditions. Further details on the fundamentals of XCT imaging may be found in, e.g., [ 22 , 33 ].…”

Section: Methodsmentioning

confidence: 99%

“…An exception is the non-standard scan A5, for which the FOV was extended by offsetting the sample from the centre of rotation (COR) and acquiring projections throughout a 360° range—thus capturing the entire sample. This is known as the ‘half-acquisition’ or ‘offset scanning’ technique, where half of the sample width is radiographed per 180° rotation [ 33 , 36 , 37 ]. This was done to assess the effect of this acquisition technique on contact detection, if any, and is the reason behind the preparation of a sample considerably wider than the FOV of the system under conventional scanning conditions.…”

Section: Methodsmentioning

confidence: 99%

“…Between 721 and 3601 projections per 180° rotation were obtained for each scan using a fly-scan technique where the sample rotates continuously during projection acquisition. The number of projections represented between 14 and 70% of the Nyquist optimum of 5152 projections for the 68.9 mm ROI at the centre of the FOV (0.5 × π × 3280 ROI voxel width ≈ 5152 projections; [ 33 ]). Based on Villarraga-Gómez and Smith [ 25 ], it was surmised that increasing the number of projections beyond 70% of the Nyquist optimum would have delivered limited improvements in reconstructed image quality.…”

Section: Methodsmentioning

confidence: 99%

“…The overlap strip was merged using a ‘ramp’ (or ‘tapper’) linear weighting method. Further details on FBP reconstruction are available in, e.g., [ 22 , 33 ].…”

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

On Acquisition Parameters and Processing Techniques for Interparticle Contact Detection in Granular Packings Using Synchrotron Computed Tomography

2022

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X-ray computed tomography (XCT) is regularly employed in geomechanics to non-destructively measure the solid and pore fractions of soil and rock from reconstructed 3D images. With the increasing availability of high-resolution XCT imaging systems, researchers now seek to measure microfabric parameters such as the number and area of interparticle contacts, which can then be used to inform soil behaviour modelling techniques. However, recent research has evidenced that conventional image processing methods consistently overestimate the number and area of interparticle contacts, mainly due to acquisition-driven image artefacts. The present study seeks to address this issue by systematically assessing the role of XCT acquisition parameters in the accurate detection of interparticle contacts. To this end, synchrotron XCT has been applied to a hexagonal close-packed arrangement of glass pellets with and without a prescribed separation between lattice layers. Different values for the number of projections, exposure time, and rotation range have been evaluated. Conventional global grey value thresholding and novel U-Net segmentation methods have been assessed, followed by local refinements at the presumptive contacts, as per recently proposed contact detection routines. The effect of the different acquisition set-ups and segmentation techniques on contact detection performance is presented and discussed, and optimised workflows are proposed.

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“…Additionally, the energy spectrum can usually be tuned to achieve monochromatic conditions. Further details on the fundamentals of XCT imaging may be found in, e.g., [ 22 , 33 ].…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…The overlap strip was merged using a ‘ramp’ (or ‘tapper’) linear weighting method. Further details on FBP reconstruction are available in, e.g., [ 22 , 33 ].…”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

On Acquisition Parameters and Processing Techniques for Interparticle Contact Detection in Granular Packings Using Synchrotron Computed Tomography

2022

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“…X‐ray computed tomography (CT) 20,21 is a powerful technique to characterize the 3D microstructural evolution nondestructively. In particular, multiscale tomography is a 3D imaging method that combines multiple tomographic systems with different fields of view and spatial resolution so as to perform a high spatial resolution measurement with a wide field of view 22,23 .…”

Section: Introductionmentioning

confidence: 99%

Synchrotron X‐ray multiscale tomography: Visualization of heterogeneous microstructures and defects in ceramics

Okuma

Wakai

2023

J Am Ceram Soc.

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Synchrotron X‐ray multiscale tomography is a three‐dimensional (3D) imaging method that combines microtomography and nanotomography to perform a high spatial resolution measurement with a wide field of view. We show how this method can be used to track the 3D microstructural evolution at multiple length scales in powder processing, sintering, and microfracture of ceramics. Heterogeneity, complexity, diversity, and hierarchical structure of powder compact lead to various types of defects that control the quality, reliability, and lifetime of products. The elimination and formation of defects are affected by applied stress in spark plasma sintering and by internal stresses generated during differential sintering and constrained sintering. The complex subsurface crack system induced by Vickers indentation demonstrates how heterogeneous microstructures control the toughening mechanisms.

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In situ 3D crystallographic characterization of deformation-induced martensitic transformation in a metastable Fe–Cr–Ni austenitic alloy by X-ray microtomography

Takakuwa,

Iwano,

Hirayama

et al. 2024

Sci Rep

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Excellent strength–ductility balance in metastable Fe–Cr–Ni austenitic alloys stems from phase transformation from austenite (fcc structure) to αʹ martensite (bcc structure) during deformation, namely deformation-induced αʹ martensitic transformation (DIMT). Here, DIMT in a metastable Fe–17Cr–7Ni austenitic alloy was detected in situ and characterized in three dimensions (3D) by employing synchrotron radiation X-ray microtomography. This technique utilizes refraction contrast, which is attributable to the presence of phase boundaries between the parent austenite and the newly formed αʹ martensite phase. By combining microtomography and position-sensitive X-ray diffraction, we succeeded in crystallographically identifying multiple αʹ martensite phases continuously transformed in four groups from a single parent austenitic phase.

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Hardware

Cited by 5 publications

References 43 publications

On Acquisition Parameters and Processing Techniques for Interparticle Contact Detection in Granular Packings Using Synchrotron Computed Tomography

On Acquisition Parameters and Processing Techniques for Interparticle Contact Detection in Granular Packings Using Synchrotron Computed Tomography

Synchrotron X‐ray multiscale tomography: Visualization of heterogeneous microstructures and defects in ceramics

In situ 3D crystallographic characterization of deformation-induced martensitic transformation in a metastable Fe–Cr–Ni austenitic alloy by X-ray microtomography

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