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X-ray optics and imaging with hard coherent synchrotron radiation [Elektronski vir]Baruchel, José ...Results obtained on the ID19 beamline at ESRF, where particularly high coherence is associated with the long source-to-sample distance and the small size of the x-ray source, illustrate the ... possibilities of imaging using coherence. These features make the imaging of phase objects extremely simple, since a 'propagation' technique, similar to the defocusing mode of electron microscopy and to in-line Gabor holography in optics, can be used. The physical principle involved is Fresnel diffraction. We used this 'propagation' technique both to measure, via the figures obtained from a fiber and a periodic grating, the source size, and to image objects with negligible absorption for hard x-rays but appreciable variations in optical path length. Examples of the latter ar two or three-dimensional images of light natural or artificial materials. The 3D reconstruction can be performed either with a filtered back- projection algorithm designed for attenuation tomography, which was shown to be a good approximation in some cases, or with a phase reconstruction procedure similar to that used for electron microscopy. The spurious images associated with beam line components, and the conditions for coherence preservation are also briefly discussed.Vir: Coherent electron-beam x-ray sources [Elektronski vir] : techniques and applications : 31 July-1 August 1997, San Diego, California (Vol. 3154, 1997, str. 51-62)Vrsta gradiva - prispevek na konferenci ; neleposlovje za odrasleLeto - 1997Jezik - angleškiCOBISS.SI-ID - 143490819
Avtor
Baruchel, José |
Buffiére, Jean-Yves |
Cloetens, Peter |
Guigay, Jean-Pierre |
Mancini, Lucia |
Peix, Gilles |
Peyrin, Françoise |
Pateyron-Salome, Murielle |
Schlenker, Michel |
Spanne, Per O.
Teme
topografija rentgenske difrakcije |
sinhrotronsko sevanje |
skladnost |
fazni kontrast |
trdi rentgenski žarki |
X-ray diffraction topography |
synchrotron radiation |
phase contrast |
hard X-rays
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Baruchel, José | ![]() |
Buffiére, Jean-Yves | ![]() |
Cloetens, Peter | ![]() |
Guigay, Jean-Pierre | ![]() |
Mancini, Lucia | 56577 |
Peix, Gilles | ![]() |
Peyrin, Françoise | ![]() |
Pateyron-Salome, Murielle | ![]() |
Schlenker, Michel | ![]() |
Spanne, Per O. | ![]() |
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