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Search query: spatial-distortion correction
206 articles match your search "spatial-distortion correction"Results 1 to 10, sorted by relevance:
computer programs
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SpatDistCalib: a GUI Python software for spatial-distortion correction of 2D detectors using splines
In this article, Python software with a graphical user interface (GUI) for spatial-distortion correction, using any regular grid as the calibration pattern and producing spline files, is presented.
research papers
A high-precision method for tilt calibration of area detectors is presented. The procedure takes into account continuously varying spatial distortions.
beamlines
Corrections that allow for high-precision integration of part or full solid-angle datasets from the long-aspect-ratio Pilatus 900k-W device at ESRF beamline ID06-LVP are presented.
PhotonMEADOW2023 workshop
The beam shaping optics of synchrotrons and X-ray free-electron lasers are routinely measured using deflectometric profilometers, which use autocollimators to evaluate the surface slope from the displacement of a reticle image on a detector. Here, novel strategies to reduce systematic measurement errors by using a set of overlapping images of the reticle obtained at different positions on the detector, which can reduce the systematic errors by up to a factor of four to five without recourse to external measurements, are discussed.
research papers
Software and hardware methods have been developed to correct images for spatial and intensity distortions produced by optical and electro-optical components in X-ray area detectors. Spatial distortions are divided into two types: gross distortions produced by the inherent properties of the detector components and local distortions formed by irregularities in the components. Intensity distortions are separated into three types: those caused by background nonuniformity; those resulting from pixel-dependent nonuniform intensity response; and those resulting from time-dependent variations in background and incident beam intensity. From background, flat-field, reference and mask images, `forward' and `reverse' interpolation tables are generated to correct for spatial distortions and a lookup table is generated to correct for nonuniform sensitivity. The routines have been used successfully on four different area detectors to correct entire images or to correct intensities of individual Bragg peaks. The spatial-distortion correction is good to within 0.1 pixels and the nonuniformity correction to ≲ 2%.
research papers
An algorithm has been developed that effectively corrects and tracks angular distortions, enabling BCDI to work much more robustly and accurately in a wider range of challenging experimental scenarios.
research papers
Spherical aberrations in nanofocused X-ray beams generated by beryllium compound refractive lenses at 8.2 keV and 35 keV are corrected via refractive phase plates fabricated by subtractive and additive technology.
research papers
The linear shape control and actuation of a modeled adaptive X-ray optic in a cantilever geometry is described, showing that control is mathematically similar to that of the more common mounting approaches.
research papers
Ptychography has been developed and routinely employed as an at-wavelength metrology method on a low coherence dipole magnet beamline.
research papers
This article provides a unifying description of the diffraction and signal acquisition geometries of a 3D Bragg coherent diffraction imaging (BCDI) measurement, obtained from fundamental considerations of Fourier-conjugate spaces. Rigorously derived and presented in a compact operator notation, this approach can be easily generalized to any set of BCDI degrees of freedom.
