Calibration and optimization of Bragg edge analysis in energy-resolved neutron imaging experiments

Tremsin, Anton S.; Bilheux, Hassina Z.; Bilheux, Jean-Ch.; Shinohara, T.; Oikawa, Kenichi; Gao, Yan

doi:10.1016/j.nima.2021.165493

Cited by 4 publications

(2 citation statements)

References 41 publications

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“…In a similar fashion, most neutron imaging instruments are highly flexible and will require corresponding neutron flight path calibrations. It is known that the neutron flight path can vary across the beam size, which has significant implications for scientific applications [25]. The described chopper based method will hence be employed in the commissioning of the ODIN beamline at ESS [2].…”

Section: Discussionmentioning

confidence: 99%

Evaluation of a method for time-of-flight, wavelength and neutron flight path calibration for neutron scattering instruments by means of a mini-chopper and standard neutron monitors

et al. 2023

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Accurate conversion of neutron time-of-flight (TOF) to wavelength is of fundamental importance to neutron scattering measurements in order to ensure the accuracy of the instruments and the experimental results. Equally important in these measurements is the determination of uncertainties, and with the appropriate precision. Especially in cases where instruments are highly configurable, the determination of the absolute wavelength after any change must always be performed (e.g. change of detector position). Inspired by the manner with which neutron spectrometers determine the absolute wavelength, we evaluate for the first time, in the author's knowledge, a commonly used method for converting TOF to neutron wavelength by measuring the neutron flight path length from the source of neutrons to a monitor and we proceed to analytically calculate the uncertainty contributions that limit the precision of the conversion. The method was evaluated at the V20 test beamline at the Helmholtz Zentrum Berlin (HZB), emulating the ESS source with a long pulse of 2.86 ms length and 14 Hz repetition rate, by using a mini-chopper operated at 140 Hz and two portable beam monitors (BMs), as well as accompanied data acquisition infrastructure. The mini-chopper created well-defined neutron pulses and the BM was placed at two positions, enabling the average wavelength of each of the pulses created to be determined. The used experimental setup resulted in absolute wavelength determination at the monitor positions with a δλ mean / λ mean of ∼1.8% for λ > 4 Å. With the use of a thinner monitor, a δλ mean / λ mean of ∼1% can be reached and with a modest increase of the distance between the reference monitor positions a δλ mean / λ mean of below 0.5% can be achieved. Further improvements are possible by using smaller chopper disc openings and a higher rotational speed chopper. The method requires only two neutron measurements and doesn't necessitate the use of crystals or complex fitting with sigmoid functions and multiple free variables, and could constitute a suitable addition to imaging, diffraction, reflectometers and small angle neutron scattering instruments, at spallation sources, that do not normally utilise fast choppers.

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Section: Discussionmentioning

confidence: 99%

Evaluation of a method for time-of-flight, wavelength and neutron flight path calibration for neutron scattering instruments by means of a mini-chopper and standard neutron monitors

et al. 2023

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“…A lot of crystalline microstructural information can be evaluated using this method, e.g., crystalline phase fraction, [15][16][17][18] crystallographic texture, 11,19,20) crystallite size, 11) macrostrain, [21][22][23][24] and microstrain/dislocation. 25) The Braggedge wavelength broadening effect has frequently been used for the analysis and imaging of the martensite phase in ferrite-martensite steel.…”

Section: Visualising Martensite Phase Fraction In Bulk Ferrite Steel ...mentioning

confidence: 99%

Visualising Martensite Phase Fraction in Bulk Ferrite Steel by Superimposed Bragg-edge Profile Analysis of Wavelength-resolved Neutron Transmission Imaging

et al. 2022

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Monitoring residual strain relaxation and preferred grain orientation of additively manufactured Inconel 625 by in-situ neutron imaging

Tremsin

Gao

Makinde

et al. 2021

Additive Manufacturing

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Calibration and optimization of Bragg edge analysis in energy-resolved neutron imaging experiments

Cited by 4 publications

References 41 publications

Evaluation of a method for time-of-flight, wavelength and neutron flight path calibration for neutron scattering instruments by means of a mini-chopper and standard neutron monitors

Evaluation of a method for time-of-flight, wavelength and neutron flight path calibration for neutron scattering instruments by means of a mini-chopper and standard neutron monitors

Visualising Martensite Phase Fraction in Bulk Ferrite Steel by Superimposed Bragg-edge Profile Analysis of Wavelength-resolved Neutron Transmission Imaging

Monitoring residual strain relaxation and preferred grain orientation of additively manufactured Inconel 625 by in-situ neutron imaging

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