Abstract:
A modified phase shifting mask is used to improve performance over traditional Zernike phase contrast imaging. The configurations can lead to an improved imaging methodology potentially with reduced artifacts and more than one order of magnitude gain in photon efficiency, in some examples. Moreover, it can be used to yield a direct representation of the sample's phase contrast information without the need for additional specialized post-acquisition image analysis. The approach can be applied to both wide-field and scanning configurations by using a phase mask including a pattern of phase elements and an illumination mask, having a pattern of holes, for example, that corresponds to a pattern of the phase mask.
Abstract:
Es werden Verfahren und Vorrichtungen zur additiven Fertigung von Werkstücken („3D-Druck") bereitgestellt. Dabei wird zur Analyse während der Fertigung eine Prüfung mit einem Prüfverfahren, beispielsweise mittels Laserultraschall, durchgeführt. Zur Analyse wird das Ergebnis der Prüfung mit einem Ergebnis der Simulation der Prüfung verglichen.
Abstract:
A method and system for three dimensional crystallographic grain orientation mapping illuminates a polycrystalline sample with a broadband x-ray beam derived from a laboratory x-ray source, detects, on one or more x-ray detectors, diffracted beams from the sample, and processes data from said diffracted beams with the sample in different rotation positions to generate three dimensional reconstructions of grain orientation, position, and/or 3-D volume. A specific, cone beam, geometry leverages the fact that for a point xray source with a divergent beam on reflection of an extended crystal grain diffracts x-rays such that they are focused in the diffraction plane direction.