Results 201 to 210 of about 1,750,058 (245)
Some of the next articles are maybe not open access.
Diffraction Images in the Polarizing Microscope
Journal of the Optical Society of America, 1959In the polarizing microscope set for extinction, only that image whose polarization has been altered is available to form an image. The lenses themselves introduce such an alternation by rotation of the plane of polarization of rays having oblique incidence.
H, KUBOTA, S, INOUE
openaire +2 more sources
Diffraction Imaging Based on the Diffraction Operator
Proceedings, 2011Seismic diffractions carry detailed structure information. Some of these structures are well-known as common hydrocarbon traps, such as faults, pinch-outs, unconformities and structures the size of which is in the order of the wavelength. Therefore, the development of computational resource capable of detecting diffractor points with a good resolution ...
J. J. S. de Figueiredo +5 more
openaire +1 more source
Diffraction in neutron imaging—A review
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2018Abstract Neutron imaging is a highly successful experimental technique ever since adequate neutron sources were available. In general, neutron imaging is performed with a wide wavelength spectrum for best flux conditions in transmission geometry. Neutrons provide outstanding features in the penetration of many structural materials, which often makes ...
Woracek, Robin +3 more
openaire +4 more sources
Diffraction imaging for fracture detection
69th EAGE Conference and Exhibition - Workshop Package, 2007The present way in fractures studies usually consists in using indirect indicators such as anisotropy, well log information etc. On the other hand, it is diffracted waves that contain direct and the most valuable information about fracture presents in the subsurface.
E. Landa, S. Fomel, T.M. Taner
openaire +1 more source
Diffraction elimination of slow images
CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference, 2009All classical wave fields are subjected to diffraction throughout their propagation. In many systems, a reduction or elimination of the diffraction spreading of beamlike fields are obtained by manipulating the susceptibility in real space and inducing a gradient of the index of refraction. Similarly to wave-guiding, only specific modes may propagate in
O. Firstenberg +3 more
openaire +1 more source
Magnetic resonance diffractive imaging
IEEE Transactions on Biomedical Engineering, 2002Magnetic resonance (MR) diffractive imaging is proposed as a new approach to MR angiography. The expression of the nuclear MR signal is similar to the equation for the Fresnel diffraction of a three-dimensional (3-D) object in light or sound waves. The proposed technique offers the possibility of fast angiographic imaging and the on-line reconstruction
Satoshi Ito +2 more
openaire +3 more sources
Dynamic sample imaging in coherent diffractive imaging
Optics Letters, 2011As the resolution in coherent diffractive imaging improves, interexposure and intraexposure sample dynamics, such as motion, degrade the quality of the reconstructed image. Selecting data sets that include only exposures where tolerably little motion has occurred is an inefficient use of time and flux, especially when detector readout time is ...
Jesse N, Clark +7 more
openaire +2 more sources
2016
In this chapter, we discuss two subjects in which diffraction is the dominant process in image formation. The first argument, developed in the first two sections, is the Abbe theory of image formation. The theory is valid in general, but is easier to understand under conditions of coherence.
openaire +1 more source
In this chapter, we discuss two subjects in which diffraction is the dominant process in image formation. The first argument, developed in the first two sections, is the Abbe theory of image formation. The theory is valid in general, but is easier to understand under conditions of coherence.
openaire +1 more source
Optical image encryption based on diffractive imaging
Optics Letters, 2010In this Letter, we propose a method for optical image encryption based on diffractive imaging. An optical multiple random phase mask encoding system is applied, and one of the phase-only masks is selected and laterally translated along a preset direction during the encryption process.
Chen, W., Chen, X., Sheppard, C.J.R.
openaire +2 more sources
High-contrast imaging for weakly diffracting specimens in coherent diffraction imaging
Chinese Optics Letters, 2013Coherent diffraction imaging (CDI) and ptychography techniques bypass the difficulty of having highquality optics in X-ray microscopy by using a numerical reconstruction of the image that is obtained by inverting the diffracted intensity recorded by a charge-coupled device array. However, the reconstruction of the image from the intensity data obtained
Xingchen Pan Xingchen Pan +4 more
openaire +1 more source