Zobrazeno 1 - 10
of 47
pro vyhledávání: '"Bérujon, Sébastien"'
Autor:
Pavlov, Konstantin M., Paganin, David M., Morgan, Kaye S., Heyang, Li, Berujon, Sebastien, Quénot, Laurène, Brun, Emmanuel
Publikováno v:
Phys. Rev. A 104, 053505 (2021)
When a macroscopic-sized non-crystalline sample is illuminated using coherent x-ray radiation, a bifurcation of photon energy flow may occur. The coarse-grained complex refractive index of the sample may be considered to attenuate and refract the inc
Externí odkaz:
http://arxiv.org/abs/2105.10693
Autor:
Berujon, Sebastien, Cojocaru, Ruxandra, Piault, Pierre, Celestre, Rafael, Roth, Thomas, Barrett, Raymond, Ziegler, Eric
In a previous paper, we reviewed theoretically some of the available processing schemes for X-ray wavefront sensing based on random modulation. We here show experimental applications of the technique for characterising both refractive and reflective
Externí odkaz:
http://arxiv.org/abs/1912.05432
Autor:
Celestre, Rafael, Berujon, Sebastien, Roth, Thomas, del Rio, Manuel Sanchez, Barrett, Raymond
Compound refractive lenses (CRL) offer outstanding potential for probe formation in X-ray micro- and nano-analysis as well as for imaging applications, but effective aberration-free focusing of X-rays is a key consideration when high spatial resoluti
Externí odkaz:
http://arxiv.org/abs/1911.06712
Autor:
Pavlov, Konstantin M., Paganin, David M., Li, Heyang, Berujon, Sebastien, Rougé-Labriet, Hélène, Brun, Emmanuel
Publikováno v:
Journal of Optics 22 125604 (2020)
We develop X-ray Multi-modal Intrinsic-Speckle-Tracking (MIST), a form of X-ray speckle-tracking that is able to recover both the position-dependent phase shift and the position-dependent small-angle X-ray scattering (SAXS) signal of a phase object.
Externí odkaz:
http://arxiv.org/abs/1911.06814
Autor:
Pavlov, Konstantin M., Heyang, Li, Paganin, David M., Berujon, Sebastien, Rougé-Labriet, Hélène, Brun, Emmanuel
Publikováno v:
Phys. Rev. Applied 13, 054023 (2020)
We develop a means for speckle-based phase imaging of the projected thickness of a single-material object, under the assumption of illumination by spatially random time-independent x-ray speckles. These speckles are generated by passing x rays throug
Externí odkaz:
http://arxiv.org/abs/1908.00411
Autor:
Berujon, Sebastien, Cojocaru, Ruxandra, Piault, Pierre, Celestre, Rafael, Roth, Thomas, Barrett, Raymond, Ziegler, Eric
X-ray near-field speckle-based phase-sensing approaches provide efficient means to characterise optical elements. Here, we present a theoretical review of several of these speckle methods in the frame of optical characterisation and provide a general
Externí odkaz:
http://arxiv.org/abs/1902.09418
Publikováno v:
Phys. Rev. A 98, 053813 (2018)
We develop a speckle-tracking method for x-ray phase-contrast imaging, based on the concept of geometric flow. This flow is a conserved current associated with deformation of illuminating x-ray speckles induced by passage through a sample. The method
Externí odkaz:
http://arxiv.org/abs/1808.00456
Autor:
Berujon, Sebastien, Ziegler, Eric
Publikováno v:
Phys. Rev. A 95, 063822 (2017)
We previously demonstrated near-field speckle scanning based x-ray imaging to be an easy-to-implement phase sensing method capable of providing both high sensitivity and high resolution. Yet, this performance combination could only be achieved at the
Externí odkaz:
http://arxiv.org/abs/1612.09286
Autor:
Bérujon, Sébastien
Cette thèse présente des travaux de recherche de métrologie en ligne de faisceaux de rayons X dans les installations synchrotrons. Deux approches principales ont été étudiées pour extraire la phase d'un front d'onde X : les méthodes utilisant
Externí odkaz:
http://www.theses.fr/2013GRENY010/document
Autor:
Berujon, Sebastien, Ziegler, Eric
Publikováno v:
Phys. Rev. Applied 5, 044014 (2016)
We demonstrate computerized tomography (CT) reconstructions from absorption, phase and dark-field signals obtained from scans acquired when the x-ray probe light is modulated with speckle. Two different interlaced schemes are proposed to reduce the n
Externí odkaz:
http://arxiv.org/abs/1507.05807