Large area high resolution neutron imaging detector for fuel cell research

Tötzke, Christian; Manke, Ingo; Hilger, André; Choinka, Gerard; Kardjilov, Nikolay; Arlt, Tobias; Markötter, Henning; Schröder, Alexander; Wippermann, Klaus; Stolten, Detlef; Hartnig, Christoph; Krüger, Phillip; Kühn, Reimer; Banhart, John

doi:10.1016/j.jpowsour.2011.01.049

Cited by 73 publications

(29 citation statements)

References 37 publications

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“…The most common standard detector system is based on scintillator screens converting neutron radiation into electromagnetic radiation in the visible wavelength range, combined with a highly light sensitive CCD or CMOS camera acquiring light images. Such a system is additionally equipped with an optical lens system for focusing and adjusting the size of the field of view (FOV) and with mirrors preventing placing a camera directly in the neutron beam [18][19][20]. Detector technology of this type is well established and "ready to use" setups are already commercially available.…”

Section: Introductionmentioning

confidence: 99%

Performance of the Commercial PP/ZnS:Cu and PP/ZnS:Ag Scintillation Screens for Fast Neutron Imaging

Makowska

Walfort²,

Zeller³

et al. 2017

J. Imaging

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Abstract:Fast neutron imaging has a great potential as a nondestructive technique for testing large objects. The main factor limiting applications of this technique is detection technology, offering relatively poor spatial resolution of images and low detection efficiency, which results in very long exposure times. Therefore, research on development of scintillators for fast neutron imaging is of high importance. A comparison of the light output, gamma radiation sensitivity and spatial resolution of commercially available scintillator screens composed of PP/ZnS:Cu and PP/ZnS:Ag of different thicknesses are presented. The scintillators were provided by RC Tritec AG company and the test performed at the NECTAR facility located at the FRM II nuclear research reactor. It was shown that light output increases and the spatial resolution decreases with the scintillator thickness. Both compositions of the scintillating material provide similar light output, while the gamma sensitivity of PP/ZnS:Cu is significantly higher as compared to PP/ZnS:Ag-based scintillators. Moreover, we report which factors should be considered when choosing a scintillator and what are the limitations of the investigated types of scintillators.

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Section: Introductionmentioning

confidence: 99%

Performance of the Commercial PP/ZnS:Cu and PP/ZnS:Ag Scintillation Screens for Fast Neutron Imaging

Makowska

Walfort²,

Zeller³

et al. 2017

J. Imaging

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show abstract

“…The neutron detection method utlilizes a neutron sensitive scintillator, which converts captured neutron radiation into photons of visible light, which consequently are recorded by a CCD camera [30], [31]. For this experiment a double crystal monochromator [32] and a detector setup consisting of a 6 Li-based scintillator and a CCD camera were utilized, resulting in an image with pixel size of 100 um.…”

Section: Methodsmentioning

confidence: 99%

Coupling between creep and redox behavior in nickel - yttria stabilized zirconia observed in-situ by monochromatic neutron imaging

Makowska

Kuhn

Frandsen

et al. 2017

Journal of Power Sources

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“…Recently, several studies including synchrotron X-ray tomography [39][40][41] and focussed ion beam/scanning electron microscope (FIB/SEM) tomography [42,43] have investigated the properties of fuel cell components in the 3D domain to further increase the understanding of the structure-performance relationship. Neutron imaging has been proven to be a powerful tool to visualize liquid water inside the components of PEMFCs [44,45]. Neutron imaging is a highly sensitive method to detect light atoms like hydrogen, whereas metals and graphite plates show lower interactions with neutrons and therefore tend to be rather transparent to it.…”

Section: Introductionmentioning

confidence: 99%

Influence of Structural Modification of Micro‐Porous Layer and Catalyst Layer on Performance and Water Management of PEM Fuel Cells: Hydrophobicity and Porosity

et al. 2020

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The influence of hydrophobicity and porosity of the catalyst layer (CL) and cathode microporous layer (MPLC) on water distribution and performance of polymer electrolyte membrane fuel cell (PEMFC) is investigated. Hydrophobicity of the layers is altered with the addition of PTFE (polytetrafluoroethylene) and mono‐dispersed polymer particles are utilized to introduce the macro‐pores with a diameter of 0.5 µm and 30 µm within the CL and MPLC, respectively. The treated materials are implemented in a specially designed fuel cell with an active area of 8 cm2 to perform operando high‐resolution neutron tomography measurements. At high current density and humid operating conditions, MPLs with higher PTFE content increase the overall water content of the cell. The more hydrophobic MPL (40 wt.% PTFE) performs below the corresponding reference MPL (20 wt.% PTFE), whereas the performance result of double layer MPLC gives hint for further potential improvements of such design. The local water saturation beneath the land regions with the presence of perforated CL and MPLC is increased which is explained by lower capillary pressure barriers of bigger pores. Despite a higher water content, the perforated layers enhance the performance of the cell at both dry (RH 70%) and humid conditions (RH 120%), indicating that the parallel two‐phase flow is facilitated where the oxygen is transported through small pores and the water is preferentially transported through the bigger pores.

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Large area high resolution neutron imaging detector for fuel cell research

Cited by 73 publications

References 37 publications

Performance of the Commercial PP/ZnS:Cu and PP/ZnS:Ag Scintillation Screens for Fast Neutron Imaging

Performance of the Commercial PP/ZnS:Cu and PP/ZnS:Ag Scintillation Screens for Fast Neutron Imaging

Coupling between creep and redox behavior in nickel - yttria stabilized zirconia observed in-situ by monochromatic neutron imaging

Influence of Structural Modification of Micro‐Porous Layer and Catalyst Layer on Performance and Water Management of PEM Fuel Cells: Hydrophobicity and Porosity

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