Results 291 to 300 of about 109,137 (327)

Wavefront processing of radio-frequency wavefront data

Proceedings of the IEEE, 1984
A 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.
G.P. Tricoles, E.E. Brundege, E.L. Rope
openaire   +1 more source

Wavefront Aberration and Wavefront Shape

2016
The study of optical systems may be considered from two different perspectives, namely systems analysis and systems design, respectively.
openaire   +1 more source

Bilinear wavefront transformation

Journal of the Optical Society of America A, 2009
Truncated 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.
openaire   +2 more sources

A reference wavefront for wavefront sensing instruments

Workshop on Optical Fabrication and Testing, 1986
A reference light source (RLS) was designed to allow the measurement and removal of system wavefront errors in wavefront sensing instruments. The wavefront of the RLS is produced by collimating and re-focussing the output of a laser diode onto a 1 micron pinhole aperture.
Lars A. Selberg, Bruce E. Truax
openaire   +1 more source

Ptychographic wavefront cameras

Optics Letters
We introduce a snapshot wavefront camera capable of reconstructing the complex field of an object with near quantum-limited accuracy. This system incorporates a diffraction grating at the entrance aperture and an array of cameras positioned to align with the grating orders, capturing the field with varying impulse responses.
Ni Chen, David Brady
openaire   +2 more sources

Wavefront guided and custom wavefront refractive surgery

Acta Ophthalmologica, 2010
AbstractAbstract not ...
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Nonparametric narrowband wavefront estimation from wavefront gradients

IEEE Transactions on Signal Processing, 1999
The wavefield sampled by a two-dimensional (2-D) planar array can he characterized by a delayed signal. This correspondence investigates the problem of the nonparametric estimation of the delay function (or wavefront) when the waveform is narrowband. The wavefront is estimated by integrating the local estimates of the differential time of delay (TOD ...
openaire   +1 more source

A comparison of wavefront-optimized and wavefront-guided ablations

Current Opinion in Ophthalmology, 2009
Optimized aspherical as well as custom wavefront-guided treatments attempt to reduce the induction of visually disturbing aberrations than can occur with conventional spherocylindrical corneal ablation. This review highlights a comparison of the advances and limitations of the two treatments.Optimized aspherical as well as wavefront-guided corneal ...
Elliott H, Myrowitz, Roy S, Chuck
openaire   +2 more sources

The wavefront revolution

Journal of Cataract & Refractive Surgery, 2021
Scott M, MacRae, Geunyoung, Yoon
openaire   +2 more sources

Wavefront Reconstruction Methods

Journal of Refractive Surgery, 2009
Douglas D, Koch, Li, Wang, Dimitri A, Chernyak   +2 more
openaire   +3 more sources