High-resolution neutron imaging: a new approach to characterize water in anodic aluminum oxides

Ott, Noémie; Cancellieri, Claudia; Trtik, Pavel; Schmutz, Patrik

doi:10.1016/j.mtadv.2020.100121

Materials Today Advances

2020

DOI: 10.1016/j.mtadv.2020.100121

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High-resolution neutron imaging: a new approach to characterize water in anodic aluminum oxides

Noémie Ott

Claudia Cancellieri

Pavel Trtik

et al.

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2024

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Cited by 3 publications

References 80 publications

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Neutron phase filtering for separating phase- and attenuation signal in aluminium and anodic aluminium oxide

Naver,

Yetik,

Ott

et al. 2024

Sci Rep

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Neutron imaging has gained significant importance as a material characterisation technique and is particularly useful to visualise hydrogenous materials in objects opaque to other radiations. Fields of application include investigations of hydrogen in metals as well as metal corrosion, thanks to the fact that neutrons can penetrate metals better than e.g. X-rays and are highly sensitive to hydrogen. However, at interfaces refraction effects sometimes obscure the attenuation image, which is used for hydrogen quantification. Refraction, a differential phase effect, diverts the neutron beam away from the interface in the image leading to intensity gain and intensity loss regions, which are superimposed to the attenuation image, thus obscuring the interface region and hindering quantitative analyses of e.g. hydrogen content in the vicinity of the interface. For corresponding effects in X-ray imaging, a phase filter approach was developed and is generally based on transport-of-intensity considerations. Here, we compare such an approach, that has been adapted to neutrons, with another simulation-based assessment using the ray-tracing software McStas. The latter appears superior and promising for future extensions which enable fitting forward models via simulations in order to separate phase and attenuation effects and thus pave the way for overcoming quantitative limitations at refracting interfaces.

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Neutron phase filtering for separating phase- and attenuation signal in aluminium and anodic aluminium oxide

Naver,

Yetik,

Ott

et al. 2024

Sci Rep

View full text Add to dashboard Cite

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Event-based high-resolution neutron image formation analysis using intensified CMOS cameras

Gustschin,

Han,

Losko

et al. 2024

Sci Rep

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We present a versatile optical setup for high-resolution neutron imaging with an adaptable field of view and magnification that can resolve individual neutron absorption events with an image intensifier and a CMOS camera. Its imaging performance is characterized by evaluating the resolution limits of the individual optical components and resulting design aspects are discussed. Neutron radiography measurements of a Siemens star pattern were performed in event mode acquisition comparing two common high-resolution neutron scintillators, crystalline Gadolinium Gallium Garnet (GGG) and powdered Gadolinium Oxysulfide (GOS). An analysis of the light signature caused by neutron absorption events is performed and some resulting issues for both GGG and GOS regarding optical system design are addressed. Both scintillators reach similar resolution (4–5 $${\upmu }$$ μ m) in event mode acquisition despite different light emission characteristics. The findings suggest that, in the case of GOS, the resolution is limited by the size of the light clusters which in turn originate from the photon scattering at the boundaries of the powder particles comprising it, while with GGG the lower light conversion efficiency makes it challenging to collect enough photons to trigger sufficient signal amplification in the image intensifier. Overall, the proposed event-based evaluation of scintillators allows for quantifying and optimizing various design parameters, which is much more complex than adopting conventional methods based on integrated images.

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Who made the noise? Systematic approach for the assessment of neutron imaging scintillators

Boillat,

Trtik,

Lehmann

et al. 2024

Opt. Express

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We propose a method to analyze the characteristics of scintillator screens for neutron imaging applications. Using calculations based on the theory of cascaded linear steps as well as experimental measurements, we compared the characteristics of different lithium- and gadolinium-based scintillator screens. Our results show that, despite their much lower light output, gadolinium-based scintillators outperform lithium-based scintillators in terms of noise characteristics for a variety of imaging setups. However, the relative performance of scintillator screens is highly dependent on the other setup characteristics such as the beam spectrum, field of view, used optical lens and size of the camera sensor. Consequently, the selection of the best scintillator screen – as well as the scintillator characteristics assessment in new developments – requires a systematic consideration of all these elements, as enabled by the framework presented here.

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High-resolution neutron imaging: a new approach to characterize water in anodic aluminum oxides

Cited by 3 publications

References 80 publications

Neutron phase filtering for separating phase- and attenuation signal in aluminium and anodic aluminium oxide

Neutron phase filtering for separating phase- and attenuation signal in aluminium and anodic aluminium oxide

Event-based high-resolution neutron image formation analysis using intensified CMOS cameras

Who made the noise? Systematic approach for the assessment of neutron imaging scintillators

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