Results 161 to 170 of about 4,282 (222)
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Applied Optics, 1967
Among the conceivable uses of Fresnel Zone Plates (FZP) are image formation, synthesis of holograms, coherence measurements, spectrometry, optical analog computation, and optical testing. Sometimes it is desirable to change the scale of the FZP continuously, for example to give a zoom lens effect when the FZP is used for image formation.
A W, Lohmann, D P, Paris
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Among the conceivable uses of Fresnel Zone Plates (FZP) are image formation, synthesis of holograms, coherence measurements, spectrometry, optical analog computation, and optical testing. Sometimes it is desirable to change the scale of the FZP continuously, for example to give a zoom lens effect when the FZP is used for image formation.
A W, Lohmann, D P, Paris
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Dielectrophoretically controlled Fresnel zone plate
Lab on a Chip, 2015We present a novel switchable Fresnel zone plate, created using nanoparticle suspensions which are controlled by dielectrophoresis.
A F, Chrimes +4 more
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Fresnel zones calculation Part 2
Applied Optics, 1976The method of the contour integral of Maggi-Rubinowicz is used to calculate exactly the contribution of a Fresnel zone taken over a general plane for the case of an incident spherical wave.
R M, Shoucri, C, Paquet
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Supplementary Zones-surrounded Fresnel Zone Plate
JSAP-OSA Joint Symposia 2014 Abstracts, 2014The supplementary zones surround an ordinary Fresnel Zone Plate (FZP) are used to improve the optical resolution at focus. Based on the Fresnel-Kirchhoff diffraction formula, an optimization model is used to design the supplementary zones-included FZP (SZFZP).
Yen-Min Lee +8 more
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SEG Technical Program Expanded Abstracts 1995, 1995
Three case histories demonstrate the significance of the Fresnel zone, and the importance of 3-D seismic. In the first example, an operator attempted to acquire 2-D seismic data to determine whether a producing reservoir on an adjacent property covered sufficient area on his property to warrant a well.
James L. Allen +2 more
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Three case histories demonstrate the significance of the Fresnel zone, and the importance of 3-D seismic. In the first example, an operator attempted to acquire 2-D seismic data to determine whether a producing reservoir on an adjacent property covered sufficient area on his property to warrant a well.
James L. Allen +2 more
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Journal of Optics A: Pure and Applied Optics, 2009
The performance of Fresnel zone plates having a polygonal boundary between zones has been studied. The contribution of the complex amplitude of each zone is calculated analytically and numerically solved. The case of a continuous phase plate is considered as the limit case in performance for each polygonal shape.
Javier Alda, Francisco Javier González
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The performance of Fresnel zone plates having a polygonal boundary between zones has been studied. The contribution of the complex amplitude of each zone is calculated analytically and numerically solved. The case of a continuous phase plate is considered as the limit case in performance for each polygonal shape.
Javier Alda, Francisco Javier González
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Fresnel zone interferometric imaging
Conference Proceedings. LEOS'98. 11th Annual Meeting. IEEE Lasers and Electro-Optics Society 1998 Annual Meeting (Cat. No.98CH36243), 2002We describe how Fourier analysis in projective coordinates allows inversion in the Fresnel zone. Since the longitudinal resolution of 3D coherence imaging falls inversely in the square of range in both the Fresnel and Fraunhofer zones, extension to the Fresnel zone dramatically improves longitudinal resolution by removing far-field range constraints in
D.J. Brady, D.L. Marks, R. Stack
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The Journal of the Acoustical Society of America, 1997
The notion of Fresnel zones for modes is introduced which is analogous to the usual Fresnel zones introduced for rays. It is shown that by using Fresnel zones for modes one can simplify the analysis of mode scattering at large-scale inhomogeneities in multimode waveguides.
Anatoly L. Virovlyansky +3 more
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The notion of Fresnel zones for modes is introduced which is analogous to the usual Fresnel zones introduced for rays. It is shown that by using Fresnel zones for modes one can simplify the analysis of mode scattering at large-scale inhomogeneities in multimode waveguides.
Anatoly L. Virovlyansky +3 more
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Journal of Applied Physics, 1992
We present a novel application of the Fresnel zone plate geometry in which the Mössbauer effect is used to focus nuclear-resonant x-ray photons and thereby to monochromatize synchrotron radiation. The calculated efficiency and energy bandpass of the Mössbauer–Fresnel zone plate monochromator compare well with those of other Mössbauer-effect ...
T. M. Mooney, E. E. Alp, W. B. Yun
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We present a novel application of the Fresnel zone plate geometry in which the Mössbauer effect is used to focus nuclear-resonant x-ray photons and thereby to monochromatize synchrotron radiation. The calculated efficiency and energy bandpass of the Mössbauer–Fresnel zone plate monochromator compare well with those of other Mössbauer-effect ...
T. M. Mooney, E. E. Alp, W. B. Yun
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Fresnel-zone binning: Fresnel-zone shape with offset and velocity function
GEOPHYSICS, 2010The concept of the Fresnel zone has been explored by many workers; most commonly, their work has involved examining the Fresnel zone in the limiting case of zero offset and constant velocity. I have examined the shape of the Fresnel zone for nonzero offset and in the situation of constant velocity gradient. Finite-offset Fresnel zones are not circular
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