Results 331 to 340 of about 154,766 (375)
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Wavefront processing of radio-frequency wavefront data
Proceedings of the IEEE, 1984A class of special-purpose processors is described. These processors are for use in holographic imaging systems that utilize electromagnetic waves with radio frequencies. The systems, which operate in very nearly real time, consist of arrays of receiving antennas with a receiver at each antenna.
E.L. Rope +2 more
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Wavefront scatter and wavefront healing
The Journal of the Acoustical Society of America, 2001While acoustic scattering is essentially a time domain phenomenon, studies of scattering from objects in water, and from boundaries, have often concentrated on time-independent/cw descriptions. There are, however, critical aspects of the scattering problem which become evident only in the time domain.
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Active wavefront sensing and wavefront control with SLMs
SPIE Proceedings, 2004Active systems are becoming more and more prevalent in the the field of optical technology. These systems require not only means of controlling wavefronts but mostly also of sensing wavefronts. This paper shows in four examples how spatial light modulators can be utilized to perform active wavefront sensing and wavefront controlling tasks. The examples
Jan Liesener +3 more
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Wavefront reconstruction error of Shack-Hartmann wavefront sensors [PDF]
Publications of the Astronomical Society of the Pacific, 1994 We have evaluated the wavefront reconstruction error for Shack-Hartmann wavefront sensors based on a series of simulations for various numbers of subapertures at various levels of measurement error in determining the Hartmann spot centroids. The optimum number of subapertures is derived for a given magnitude reference star in the cases of photon-noise ...
M. Iye, N. Takato, I. Yamaguchi
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American Journal of Ophthalmology, 2001
A DAPTIVE OPTICS WAS FIRST SUGGESTED IN 1953 BY astronomer Horace Babcock to remove the blurring effects of turbulence in the atmosphere on telescopic images of stars.1 The U.S. Defense Department later invested heavily in the development of adaptive optics technology to improve the effectiveness of laser weapons as part of its Star Wars Program.
Scott MacRae, David R. Williams
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A DAPTIVE OPTICS WAS FIRST SUGGESTED IN 1953 BY astronomer Horace Babcock to remove the blurring effects of turbulence in the atmosphere on telescopic images of stars.1 The U.S. Defense Department later invested heavily in the development of adaptive optics technology to improve the effectiveness of laser weapons as part of its Star Wars Program.
Scott MacRae, David R. Williams
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The optics of wavefront sensing [PDF]
Ophthalmology Clinics of North America, 2004 This article reviews the fundamental principles by which wavefront aberrometers measure ocular aberrations. Three different ways of interpreting aberration measurements are described in terms of wavefront phase, slope, and curvature. Although curvature is the more familiar concept from geometrical optics, the wave optics concept of wavefront phase is ...
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Wavefront guided and custom wavefront refractive surgery
Acta Ophthalmologica, 2010AbstractAbstract not ...
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Applications of wavefront technology
Journal of Cataract and Refractive Surgery, 2012This review of wavefront technology looks at 2 major aspects. The first is the basics and principles of the optics of the eye, how to decompose the wavefront in a more adequate way for interpretation, and how these aberrations affect the visual acuity. It also addresses the diversity and complexity of wavefront sensors; how these devices transform the ...
Marcony R. Santhiago +4 more
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Wavefronts and reflection groups [PDF]
Russian Mathematical Surveys, 1988 The author surveys in detail a new method of classifying the typical singularities occurring in problems on wave front sets and reflection groups. This method builds on the study of generating families of functions for given systems of rays and makes it possible to classify all generic singularities in three-dimensional problems on envelopes of systems
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Bilinear wavefront transformation
Journal of the Optical Society of America A, 2009Truncated expansions such as Zernike polynomials provide a powerful approach for describing wavefront data. However, many simple calculations with data in this form can require significant computational effort. Important examples include recentering, renormalizing, and translating the wavefront data.
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