Water ingress into a casein film quantified using time-resolved neutron imaging

2016 ◽  
Vol 18 (9) ◽  
pp. 6458-6464 ◽  
Author(s):  
E. Metwalli ◽  
H. E. Hermes ◽  
E. Calzada ◽  
U. Kulozik ◽  
S. U. Egelhaaf ◽  
...  
Keyword(s):  
Water Saturation ◽  
Neutron Radiography ◽  
Neutron Imaging ◽  
Time Resolved ◽  
Water Ingress ◽  
Casein Film

Migration of water into a casein film was probed with neutron radiography and the water saturation quantitatively analyzed.

scholarly journals In situdiagnostics of the crystal-growth process through neutron imaging: application to scintillators

2016 ◽  
Vol 49 (3) ◽  
pp. 743-755 ◽  
Author(s):  
Anton S. Tremsin ◽  
Małgorzata G. Makowska ◽  
Didier Perrodin ◽  
Tetiana Shalapska ◽  
Ivan V. Khodyuk ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Neutron Radiography ◽  
Solidification Process ◽  
Neutron Imaging ◽  
Time Resolved ◽  
Liquid Phases ◽  
Multiple Length Scales ◽  
Solidification Processes ◽  
Time Resolved Imaging

Neutrons are known to be unique probes in situations where other types of radiation fail to penetrate samples and their surrounding structures. In this paper it is demonstrated how thermal and cold neutron radiography can provide time-resolved imaging of materials while they are being processed (e.g.while growing single crystals). The processing equipment, in this case furnaces, and the scintillator materials are opaque to conventional X-ray interrogation techniques. The distribution of the europium activator within a BaBrCl:Eu scintillator (0.1 and 0.5% nominal doping concentrations per mole) is studiedin situduring the melting and solidification processes with a temporal resolution of 5–7 s. The strong tendency of the Eu dopant to segregate during the solidification process is observed in repeated cycles, with Eu forming clusters on multiple length scales (only for clusters larger than ∼50 µm, as limited by the resolution of the present experiments). It is also demonstrated that the dopant concentration can be quantified even for very low concentration levels (∼0.1%) in 10 mm thick samples. The interface between the solid and liquid phases can also be imaged, provided there is a sufficient change in concentration of one of the elements with a sufficient neutron attenuation cross section. Tomographic imaging of the BaBrCl:0.1%Eu sample reveals a strong correlation between crystal fractures and Eu-deficient clusters. The results of these experiments demonstrate the unique capabilities of neutron imaging forin situdiagnostics and the optimization of crystal-growth procedures.

Neutron Optics

2020 ◽  
pp. 311-342
Author(s):  
Andrew T. Boothroyd
Keyword(s):  
Neutron Radiography ◽  
Scattering Length ◽  
Diffraction Theory ◽  
Neutron Imaging ◽  
Bragg Diffraction ◽  
Neutron Reflectivity ◽  
Neutron Optics ◽  
Coherent Wave ◽  
Optical Phenomena ◽  
Secondary Extinction

The description of neutron optical phenomena within the framework of dynamical diffraction theory is described. The coherent wave and optical potential are introduced, and an expression for the complex neutron refractive index in terms of the scattering length density and attenuation coefficient is obtained. The extension to magnetic media and polarized neutrons is covered. Neutron reflectivity is defined, and the wavevector dependence of the reflectivity profile is derived by a transfer matrix method and an optical method. Exact results are compared with the Born approximation. The technique of neutron imaging is described, including neutron radiography and computed tomography. Several optical phenomena that occur in Bragg diffraction from near-perfect crystals, including Pendellösung oscillations, and primary and secondary extinction.

scholarly journals Development of a Neutron Imaging Station at the n_TOF Facility of CERN and Applications to Beam Intercepting Devices

Instruments ◽  
2019 ◽  
Vol 3 (2) ◽  
pp. 32 ◽  
Author(s):  
Federica Mingrone ◽  
Marco Calviani ◽  
Claudio Torregrosa Martin ◽  
Oliver Aberle ◽  
Michael Bacak ◽  
...  
Keyword(s):  
Neutron Beam ◽  
Neutron Radiography ◽  
Beam Line ◽  
Neutron Imaging ◽  
Experimental Results ◽  
Detection Systems ◽  
Experimental Area ◽  
Shortest Distance ◽  
Antiproton Production ◽  
Imaging Setup

A neutron radiography testing station has been developed exploiting the neutron beam of CERN’s n_TOF Experimental Area 2, located at the shortest distance to the neutron producing-target. The characteristics of the n_TOF neutron beam for the imaging setup are presented in this paper, together with the obtained experimental results. The results focused on the testing of several particle producing targets, including a spent antiproton production targets as well as targets from two different HiRadMat’s experiments. The possible developments of neutron imaging capabilities of the n_TOF facility in terms of detection-systems and beam-line upgrades are as well outlined.

Tracking consolidant penetration into fossil bone using neutron radiography

2013 ◽  
Vol 92 (2-3) ◽  
pp. 177-180 ◽  
Author(s):  
A.S. Schulp ◽  
R. Schouten ◽  
L. Metten ◽  
A. van de Sande ◽  
A. Bontenbal
Keyword(s):  
Neutron Radiography ◽  
Neutron Imaging ◽  
Reactor Facility ◽  
High Flux ◽  
Crucial Importance ◽  
Fossil Bone ◽  
Current Conservation ◽  
Bone Material ◽  
Conservation Practice ◽  
Flux Reactor

AbstractIn the conservation of fragile fossil bone material, impregnation by solvent-borne consolidant is often required. Understanding the mode of penetration of consolidants into fossil bone is of crucial importance. It is governed by a variety of factors; neutron imaging is a powerful tool to monitor and visualise this penetration (non-destructively). The consolidation of a vertebrate fossil from the Maastrichtian of the southeast Netherlands was imaged at the High Flux Reactor facility at Petten, the Netherlands. The analysis shows current conservation practice to result in a sufficiently deep and isotropic penetration.

Porosity analysis of carbon fibre-reinforced polymer laminates manufactured using automated fibre placement

2019 ◽  
Vol 54 (9) ◽  
pp. 1217-1231 ◽  
Author(s):  
Ebrahim Oromiehie ◽  
Ulf Garbe ◽  
B Gangadhara Prusty
Keyword(s):  
Carbon Fibre ◽  
Structural Integrity ◽  
Neutron Radiography ◽  
Tomographic Reconstruction ◽  
Neutron Imaging ◽  
Thermoplastic Composites ◽  
Reinforced Polymer ◽  
Wide Range ◽  
Fibre Reinforced Polymer ◽  
Porosity Analysis

Automated fibre placement-based manufacturing technology is increasingly being used in several engineering applications. Manufacture of carbon fibre-reinforced plastic’s small/large structures have been made possible due to its remarkable capabilities like productivity and accuracy. Nevertheless, making high-quality composite laminate using automated fibre placement relies on the proper selection of critical processing variables to avoid internal flaws during the fibre placement process. Consequently, a reliable non-destructive inspection technique is required for quality assurance and structural integrity of fabricated laminates. Neutron radiography/tomography offers unique imaging capabilities over a wide range of applications including fibre-reinforced polymer composites. The application of this technique towards tomographic reconstruction of automated fibre placement-made thermoplastic composites is presented in this paper. It is shown that the porosity analysis using neutron imaging technique provides reliable information. Additionally, using such technique valuable data regarding the size and the location of the voids in the laminate can be acquired and informed. This will assist the composite structural analysts and designers to select the appropriate processing parameters towards a defect free automated fibre placement part manufacture.

scholarly journals A QUANTITATIVE EVALUATION OF THE WATER DISTRIBUTION IN A SOIL SAMPLE USING NEUTRON IMAGING

2016 ◽  
Vol 56 (5) ◽  
pp. 388-394 ◽  
Author(s):  
Jan Šácha ◽  
Michal Sněhota ◽  
Jan Hovind
Keyword(s):  
Water Content ◽  
Soil Sample ◽  
Neutron Radiography ◽  
Three Dimensional ◽  
Neutron Imaging ◽  
Water Infiltration ◽  
Water Volume ◽  
Two Dimensional ◽  
Total Water ◽  
Beam Hardening

This paper presents an empirical method by Kang et al. recently proposed for correcting two-dimensional neutron radiography for water quantification in soil. The method was tested on data from neutron imaging of the water infiltration in a soil sample. The raw data were affected by neutron scattering and by beam hardening artefacts. Two strategies for identifying the correction parameters are proposed in this paper. The method has been further developed for the case of three-dimensional neutron tomography. In a related experiment, neutron imaging is used to record ponded-infiltration experiments in two artificial soil samples. Radiograms, i.e., two-dimensional projections of the sample, were acquired during infiltration. A calculation was made of the amount of water and its distribution within the radiograms, in the form of two-dimensional water thickness maps. Tomograms were reconstructed from the corrected and uncorrected water thickness maps to obtain the 3D spatial distribution of the water content within the sample. Without the correction, the beam hardening and the scattering effects overestimated the water content values close to the perimeter of the sample, and at the same time underestimated the values close to the centre of the sample. The total water content of the entire sample was the same in both cases. The empirical correction method presented in this study is a relatively accurate, rapid and simple way to obtain the quantitatively determined water content from two-dimensional and three-dimensional neutron images. However, an independent method for measuring the total water volume in the sample is needed in order to identify the correction parameters.

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