Results 31 to 40 of about 39,722 (316)
Slit homogenizer introduced performance gain analysis based on the Sentinel-5/UVNS spectrometer [PDF]
Atmospheric Measurement Techniques, 2021 Spatially heterogeneous Earth radiance scenes affect the atmospheric composition measurements of high-resolution Earth observation spectrometer missions.
T. Hummel +5 more
doaj +1 more source
Is the Rayleigh-Sommerfeld diffraction always an exact reference for high speed diffraction algorithms? [PDF]
, 2017 In several areas of optics and photonics like wave propagation, digital holography, holographic microscopy, diffraction imaging, biomedical imaging and diffractive optics, the behavior of the electromagnetic waves has to be calculated with the scalar ...
Mehrabkhani, Soheil, Schneider, Thomas
core +2 more sources
Wiener-Hopf solution for impenetrable wedges at skew incidence [PDF]
, 2006 A new Wiener-Hopf approach for the solution of impenetrable wedges at skew incidence is presented. Mathematical aspects are described in a unified and consistent theory for angular region problems.
Lombardi, Guido, V.G, Daniele
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Physical Review Special Topics. Accelerators and Beams, 2008 We have developed a novel method based on vector electromagnetic theory and Schelkunoff’s principles, to calculate the spectral and angular distributions of transition radiation (TR) and diffraction radiation (DR) produced by a charged particle ...
A. G. Shkvarunets, R. B. Fiorito
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Mueller Matrix Imaging Optimized by Uniform Illumination
Frontiers in Physics, 2022 In this study, we present a flat-field Mueller matrix imaging system to reduce the reconstruction error caused by critical illumination. This study demonstrates that the signal-to-noise ratio (SNR) of the reconstructed images is improved by about eight ...
Wei Guo +7 more
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A brief historical perspective of the Wiener-Hopf technique [PDF]
, 2007 It is a little over 75 years since two of the most important mathematicians of the 20th century collaborated on finding the exact solution of a particular equation with semi-infinite convolution type integral operator.
Abrahams, ID, Lawrie, JB
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Edge detection by spiral phase contrast imaging at terahertz frequencies
Electronics Letters, 2021 This paper proposes the spiral phase contrast (SPC) imaging at terahertz (THz) frequencies to achieve the target edge detection. The THz SPC imaging is built based on a classical 4f imaging system, and a spiral phase plate is placed in the Fourier plane ...
Hui Liu +5 more
doaj +1 more source
The Green-function transform and wave propagation [PDF]
, 2014 Fourier methods well known in signal processing are applied to three-dimensional wave propagation problems. The Fourier transform of the Green function, when written explicitly in terms of a real-valued spatial frequency, consists of homogeneous and ...
Kou, Shan Shan +2 more
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Diffraction theory and focusing of light by left-handed materials [PDF]
, 2002 A diffraction theory in a system consisting of left-handed and right-handed materials is proposed. The theory is based upon the Huygens's principle and the Kirchhoff's integral and it is valid if the wavelength is smaller than any relevant length of the ...
't Hooft +12 more
core +1 more source
Testing scalar diffraction theory: Gaussian beam on a slit
Journal of the Optical Society of America A, 2020 We recorded diffraction patterns using a commercially available slit and sensor over a wide range of experimental circumstances, including near- and far-field regimes and oblique incidence at large angles. We then compared the measured patterns with theoretical intensity curves calculated via the numerical integration of formulas derived within the ...
Zurak, Luka +5 more
openaire +3 more sources