The New Zanerian Alphabets by Zaner, C P

By Zaner, C P

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For untreated images recorded in the edge-detection regime the resolution is limited by the fringe spacing to about 2rp. When the fringes are disentangled in a holographic reconstruction, the spatial resolution is limited essentially by the detector. The stringent requirements on the beam incident on the sample explain why this technique emerged only recently [HAR 94, SNI 95, CLO 96, NUG 96] with the appearance of partially coherent X-ray beams delivered by third generation synchrotron radiation sources.

A new approach, called 'holotomography' is now operational. It allows to perform quantitative phase contrast tomography with a simple set-up. We used for the holographic reconstruction, in analogy with electron microscopy, a numerical procedure based on images at different distances from the sample. The feasibility of this method was demonstrated on a polystyrene foam. The results are in quantitative agreement with the known sample composition. The study of a metal alloy, with metallographic phases that are not distinguishable in the absorption mode, demonstrates the usefulness of this technique for materials sciences.

Then the electron beam is introduced in the storage ring (SR), where it produces, when accelerated by the magnetic fields which modify its trajectory, the X-ray beams. 1). This field is uniform over a portion of the trajectory in the bending magnets. It oscillates spatially in the insertion devices (wigglers and undulators) which can be set on the straight sections between two bending magnets. 2. 1. 2) and, when the source is a bending magnet or a wiggler, a continuous spectrum, spanning the whole range from the infra-red to X-rays.

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