Developments towards Bragg edge imaging on the IMAT beamline at the ISIS Pulsed Neutron and Muon Source: BEAn software

Liptak, A.; Burca, Genoveva; Kelleher, Joe; Ovtchinnikov, Evgueni; Maresca, Jacob; Horner, Aled

doi:10.1088/2399-6528/ab5575

Cited by 13 publications

(18 citation statements)

References 14 publications

(24 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, in Fig. 2 C it can be observed that for the photon event-mode profile the (200) Bragg-edge shows transmission values greater than that of the (211) Bragg-edge as compared to in the neutron event-mode profile, with the neutron event-mode profile consistent with alpha-iron profiles measured using neutron counting detectors reported in the literature 26 , 27 . This can be explained by the lower S/N of the photon event-mode data as shown in Fig.…”

Section: Event-mode Imaging Setup For Neutronssupporting

confidence: 82%

New perspectives for neutron imaging through advanced event-mode data acquisition

Losko

Han

Schillinger

et al. 2021

Sci Rep

View full text Add to dashboard Cite

Imaging using scintillators is a widespread and cost-effective approach in radiography. While different types of scintillator and sensor configurations exist, it can be stated that the detection efficiency and resolution of a scintillator-based system strongly depend on the scintillator material and its thickness. Recently developed event-driven detectors are capable of registering spots of light emitted by the scintillator after a particle interaction, allowing to reconstruct the Center-of-Mass of the interaction within the scintillator. This results in a more precise location of the event and therefore provides a pathway to overcome the scintillator thickness limitation and increase the effective spatial resolution of the system. Utilizing this principle, we present a detector capable of Time-of-Flight imaging with an adjustable field-of-view, ad-hoc binning and re-binning of data based on the requirements of the experiment including the possibility of particle discrimination via the analysis of the event shape in space and time. It is considered that this novel concept might replace regular cameras in neutron imaging detectors as it provides superior detection capabilities with the most recent results providing an increase by a factor 3 in image resolution and an increase by up to a factor of 7.5 in signal-to-noise for thermal neutron imaging.

show abstract

Section: Event-mode Imaging Setup For Neutronssupporting

confidence: 82%

New perspectives for neutron imaging through advanced event-mode data acquisition

Losko

Han

Schillinger

et al. 2021

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Scaling of the open beam datasets is preferable for a more accurate flat-field correction as all datasets may not have the same number of triggers. The methods used for overlap and scaling correction are the same as those already used on IMAT, for which a detailed description is available in [44]. This initial pre-processing stage is applied to all radiographs, which are thereafter saved as unsigned 16-bit TIFF images.…”

Section: Data Processing Methodologymentioning

confidence: 99%

In Situ Mechanical Loading and Neutron Bragg-edge Imaging, Applied to Polygranular Graphite On IMAT@ISIS

et al. 2021

View full text Add to dashboard Cite

Background Bragg edge imaging have seen significant developments in the last decade with the availability of new time-resolved detectors, however, there have been no studies of changes in local coherent scattering from grain reorientation and deformation with load. Such damage accommodation mechanism may occur in (quasi)-brittle materials. Objective We developed a novel method using in-situ Bragg imaging at the ISIS spallation neutron and muon source on the IMAT (Imaging and MATerials science and engineering) instrument using an energy-resolved detector setup. We collected and analysed data of a proof-of-concept experiment demonstrating the use of the method. Methods We have developed a loading apparatus that addresses the constraints posed by Bragg imaging, allowing us to resolve features in the material microstructure. We use energy-resolved neutron imaging to obtain images in energy bins and we have developed a set of codes to register and correlate these images, as well as detect changes in local coherent scattering, in situ. Results Preliminary results from this method on Gilsocarbon nuclear graphite allow qualitative observation of local changes in Bragg contrast, which may be due to deformation or grain reorientation. Conclusions We have demonstrated that we can track changes in local coherent scattering under mechanical load, with sufficient resolution to track features with a size above 100 microns. This method, apparatus and accompanying codes may be used on the IMAT instruments by users interested to better understand deformation in their materials.

show abstract

“…The open beam and sample beam data after overlap correction were scaled to the same number of incident neutrons. This was achieved by reducing the open beam data down to the same number of counts using a multiplication factor as described in 52 . Once scaled the sample stack was normalised by dividing pixel by pixel by the open beam data to calculate a stack of transmission images.…”

Section: Methodsmentioning

confidence: 99%

“…A stack of 2711 radiographies were collected for each test, with each radiography belonging to a specific wavelength. The data was corrected prior to Bragg-dip analysis following a method used by the BEAn software 52 . Six MCP readouts (shutter positions) were chosen to reduce the event overlap 53 .…”

Section: Calculation Of Sample Transmission Using Time-of-flight Datamentioning

confidence: 99%

2D single crystal Bragg-dip mapping by time-of-flight energy-resolved neutron imaging on IMAT@ISIS

Strickland

Tassenberg

Sheppard

et al. 2020

Sci Rep

Self Cite

View full text Add to dashboard Cite

The cold neutron imaging and diffraction instrument IMAT, at the second target station of the pulsed neutron and muon source ISIS, is used to investigate bulk mosaicity within as-cast single crystal CMSX-4 and CMSX-10 Ni-base superalloys. Within this study, neutron transmission spectrum is recorded by each pixel within the microchannel plate image detector. The movement of the lowest transmission wavelength within a specified Bragg-dip for each pixel is tracked. The resultant Bragg-dip shifting has enabled crystallographic orientation mapping of bulk single crystal specimens with good spatial resolution. The total acquisition time required to collect sufficient statistics for each test is ~ 3 h. In this work, the influence of a change in bulk solidification conditions on the variation in single crystal mosaicity was investigated. Misorientation of the (001) crystallographic plane has been visualised and a new spiral twisting solidification phenomena observed. This proof of concept work establishes time-of-flight energy-resolved neutron imaging as a fundamental characterisation tool for understanding and visualising mosaicity within metallic single crystals and provides the foundation for post-mortem deduction of the shape of the solid/liquid isotherm.

show abstract

Developments towards Bragg edge imaging on the IMAT beamline at the ISIS Pulsed Neutron and Muon Source: BEAn software

Cited by 13 publications

References 14 publications

New perspectives for neutron imaging through advanced event-mode data acquisition

New perspectives for neutron imaging through advanced event-mode data acquisition

In Situ Mechanical Loading and Neutron Bragg-edge Imaging, Applied to Polygranular Graphite On IMAT@ISIS

2D single crystal Bragg-dip mapping by time-of-flight energy-resolved neutron imaging on IMAT@ISIS

Contact Info

Product

Resources

About