Results 161 to 170 of about 2,006,423 (241)

In-line hologram with synthesized opposite-phase internal reference

2013 IEEE Antennas and Propagation Society International Symposium (APSURSI), 2013
A technique for improving phase-less measurements for holographic imaging is presented. By interchanging the radiated reference wave with a synthesized internal signal, the hologram can be further exploited by enabling advanced control of the reference.
J. Marin, J. Parron, P. de Paco
openaire   +2 more sources

Intensity equalization for elements for binary-object images reconstructed using synthesized hologram projectors

Optics and Spectroscopy, 2013
The influence of the nonlinearity of synthesized hologram projectors on the dependence of the intensity of the images reconstructed using these projectors on the image size has been investigated. A way for reducing the aforementioned dependence, based on choosing the optimal (from the point of view of providing equal intensities of images of different ...
S. N. Koreshev, D. S. Smorodinov, O. V. Nikanorov, A. D. Gromov   +3 more
semanticscholar   +3 more sources

Problem of twin-image elimination in 2-D computer synthesized hologram

SPIE Proceedings, 2007
It is well known that one of the basic functions of security holograms is the maximal complication of their nonauthorized reproduction, in other words - counterfeiting. To solve the problem, concealed images that can be observed only under special conditions are placed into a structure of the hologram.
Eugene Braginets, Vladimir Girnyk, Sergey Kostyukevych, Alexander Soroka, Irina Androsyuk   +4 more
openaire   +2 more sources

Methods of increasing the resolving power and depth of field of synthesized hologram-projectors

Journal of Optical Technology, 2016
This paper discusses the problem of increasing the resolving power of synthesized Fresnel hologram-projectors and increasing the depth of field of the images reconstructed by them. This work was applied to the case of the holograms of a two-dimensional object—for example, a photolithographic photomask or the working zone of optical pincers.
S. N. Koreshev, O. V. Nikanorov, M. A. Frolova, Ya. A. Novitskaya, R. I. Khisamov   +4 more
openaire   +2 more sources

Synthesizing hologram–projectors for photolithography on nonplanar surfaces

Journal of Optical Technology, 2015
This paper discusses how binarization and diffuse illumination of an object affect the depth of field of an image reconstructed by means of synthesized Fresnel hologram–projectors. It presents the results of an experimental study that confirm the possibility and efficiency of using a specialized software complex to synthesize and reconstruct Fresnel ...
S. N. Koreshev, O. V. Nikanorov, D. S. Smorodinov, A. D. Gromov   +3 more
openaire   +2 more sources

Three types of computer-generated hologram synthesized from multiple angular viewpoints of a three-dimensional scene

Applied Optics, 2006
We describe various techniques to synthesize three types of computer-generated hologram (CGH): the Fresnel-Fourier CGH, the Fresnel CGH, and the image CGH. These holograms are synthesized by fusing multiple perspective views of a computer-generated scene. An initial hologram is generated in the computer as a Fourier hologram.
David, Abookasis, Joseph, Rosen
openaire   +3 more sources

Acoustic Hologram Lens Made of Nanoparticle-Epoxy Composite Molding for Directing Predefined Therapeutic Ultrasound Beams

IUS, 2022
We present an acoustic hologram lens fabrication method for prototyping nondeformed hologram lenses with a tailored acoustic impedance. A pixelized hologram pattern is typically manufactured by photo-curing 3D printing methods, such as stereolithography (
Jinwook Kim, S. Kasoji, P. Durham, P. Dayton   +3 more
semanticscholar   +1 more source

COMPUTER MODEL OF HOLOGRAM SYNTHESIS BY THE REAL PHASE

The Herald of KSUCTA, №2, Part 1, 2022, 2022
Computer-synthesized holograms are widely used in areas such as optical information processing, image recognition, three-dimensional display of digital data, and modelling of holographic processes.
G.U. Tultemirova, N.T. Momunalieva, A. J. Akkozov   +2 more
semanticscholar   +1 more source

Particle size analysis using computer-synthesized holograms

IEEE Journal of Quantum Electronics, 1973
A holographic correlation method permits the determination of the diameter and size distribution of suspended particles with diameters from 1 microm to 10 microm. The method uses synthetic holograms calculated from the Mie scattering theory.
T, Tschudi, G, Herziger, A, Engel
openaire   +2 more sources