Results 71 to 80 of about 5,049 (222)

Impact of substrate curvature on grazing‐incidence small‐angle X‐ray scattering signal: theory and example of Ag thin‐film growth

Journal of Applied Crystallography, EarlyView.
The paper formally addresses the influence of the substrate curvature and size on the grazing‐incidence small‐angle X‐ray scattering (GISAXS) signal. Using the established theory, GISAXS can be combined with substrate‐curvature‐based stress measurements, which is demonstrated on the example of Ag thin‐film growth.Grazing‐incidence small‐angle X‐ray ...
Michał Kamiński, Bärbel Krause, Gregory Abadias, Alessandro Coati, Yves Garreau, Anny Michel, Andrea Resta, Karan Solanki, Alina Vlad, David Babonneau   +9 more
wiley   +1 more source

Signal‐to‐noise and spatial resolution in in‐line imaging. 3. Optimization using a simple model

Journal of Synchrotron Radiation, EarlyView.
Geometrical magnification and X‐ray energy are optimized with respect to spatial resolution, contrast, noise, radiation dose and other image quality characteristics. The optimization is performed using a simple theoretical model of a homogeneous edge feature embedded in a bulk uniform sample, and the resulting generic analytical expressions for image ...
Timur E. Gureyev, David M. Paganin, Harry M. Quiney   +2 more
wiley   +1 more source

Influence of Ionospheric Irregularities on GNSS Remote Sensing

Advances in Meteorology, 2015
We have used numerical simulation to study the effects of ionospheric irregularities on accuracy of global navigation satellite system (GNSS) measurements, using ionosphere-free (in atmospheric research) and geometry-free (in ionospheric research) dual ...
M. V. Tinin
doaj   +1 more source

Shifted Fresnel diffraction for computational holography

Optics Express, 2007
Fourier-based approaches to calculate the Fresnel diffraction of light provide one of the most efficient algorithms for holographic computations because this permits the use of the fast Fourier transform (FFT). This research overcomes the limitations on sampling imposed by Fourier-based algorithms by the development of a fast shifted Fresnel transform.
Richard P, Muffoletto, John M, Tyler, Joel E, Tohline   +2 more
openaire   +2 more sources

Errors in reconstruction of dichroic X‐ray orientation tomography due to polarization rotation of the incident beam

Journal of Synchrotron Radiation, EarlyView.
Linear dichroic X‐ray tomography is a technique in which the linear dichroism of anisotropic materials is used to image crystal orientation in three dimensions. We show that the reconstruction of tomograms is subject to errors due to the change in polarization on propagation through the material and propose strategies for mitigating these effects ...
Matthew A. Marcus, Harlan Heilman, Kas Andrle, Jayden Plumb   +3 more
wiley   +1 more source

Dual Field-of-View Off-Axis Spatially Multiplexed Digital Holography Using Fresnel’s Bi-Mirror

Sensors
Digital holography (DH) is an important method for three-dimensional (3D) imaging since it allows for the recording and reconstruction of an object’s amplitude and phase information. However, the field of view (FOV) of a DH system is typically restricted
Lavlesh Pensia, Manoj Kumar, Raj Kumar
doaj   +1 more source

X-ray computed tomography using partially coherent Fresnel diffraction with application to an optical fiber. [PDF]

Opt Express, 2021
Levine ZH, Garboczi EJ, Peskin AP, Ekman AA, Mansfield E, Holm JD.   +5 more
europepmc   +1 more source

Defocused illumination with beam‐shaping condenser for uniform wide‐field X‐ray imaging

Journal of Synchrotron Radiation, EarlyView.
A defocused illumination method based on a beam‐shaping condenser to suppress fringe artifacts arising from rectangular aperture diffraction and sub‐grating interference is developed, providing an effective and practical approach for achieving wide‐field and uniform illumination in X‐ray microscopy.The beam‐shaping condenser (BSC) has become a key ...
Kuanqiang Zhang, Yijue Luo, Yunfan Di, Chenfei Guo, Changhao Li, Menghui He, Chao Zhang, Fangfang Peng, Wen Liu, Zhao Wu, Yong Guan, Yangchao Tian, Gang Liu   +12 more
wiley   +1 more source

Light diffraction by concentrator Fresnel lenses

Optics Express, 2014
Fresnel lenses are widely used in concentrating photovoltaic (CPV) systems as primary optical elements focusing sunlight onto small solar cells or onto entrance apertures of secondary optical elements attached to the solar cells. Calculations using the Young-Maggi-Rubinowicz theory of diffraction yield analytical expressions for the amount of light ...
Thorsten, Hornung, Peter, Nitz
openaire   +2 more sources

Theoretical framework for soft X‐ray Fourier transform spectroscopy using the Wigner function

Journal of Synchrotron Radiation, EarlyView.
A theoretical framework for the propagation of partially coherent Gaussian radiation in a modified Mach–Zehnder interferometer designed for Fourier transform spectroscopy applications is presented.This work presents a theoretical framework for the propagation of partially coherent Gaussian radiation in a modified Mach–Zehnder interferometer designed ...
Chuzida Chen, Andrew Lindburg, Honghe Ding, Antoine Wojdyla, Howard Padmore, Per-Anders Glans, Jinghua Guo   +6 more
wiley   +1 more source