Journal ArticleDOI
Optical Resolution Through a Randomly Inhomogeneous Medium for Very Long and Very Short Exposures
Reads0
Chats0
TLDR
In this article, the average resolution of very-long and very-short-exposure images is studied in terms of the phase and log-amplitude structure functions, whose sum is called the wave-structure function.Abstract:
A theoretical foundation is developed for relating the statistics of wave distortion to optical resolution. The average resolution of very-long- and very-short-exposure images is studied in terms of the phase- and log-amplitude-structure functions, whose sum we call the “wave-structure function.” Those results which are comparable are in agreement with the findings of Hufnagel and Stanley who studied the average modulation transfer function of long-exposure images. It is found that the average short-exposure resolution can be significantly better than the average long-exposure resolution, but only if the wave distortion does not include substantial intensity variation.read more
Citations
More filters
Image processing
TL;DR: Parts of image processing are discussed--specifically: the mathematical operations one is likely to encounter, and ways of implementing them by optics and on digital computers; image description; and image quality evaluation.
Book ChapterDOI
V The Effects of Atmospheric Turbulence in Optical Astronomy
TL;DR: In this article, the authors discuss the effects of atmospheric turbulence in optical astronomy, summarizes the present state of the theory, reviews the experimental checks that have been made, and discusses the implications in the domain of astronomical observations.
Journal ArticleDOI
Adaptive Optics in Astronomy
Francois Roddier,Laird Thompson +1 more
TL;DR: An approach to design electro‐optical systems that measure and undo the effects of clear‐air turbulence in real time, delivering near‐diffraction‐limited performance at infrared and visible wavelengths at optical wavelengths.
Journal ArticleDOI
Atmospheric turbulence and orbital angular momentum of single photons for optical communication.
TL;DR: The work shows that the decoherence effect of atmospheric turbulence on single-photon communication systems based on orbital angular momentum states is important even for weak turbulence.
Journal ArticleDOI
Electromagnetic beam propagation in turbulent media
TL;DR: In this article, the most recent developments on the propagation of optical beams in a turbulent medium, such as the clear atmosphere, are reviewed, including beam spreading, beam wander, loss of coherence, scintillations, angle-of-arrival variations, and short-pulse effects.
References
More filters
Journal ArticleDOI
Statistics of a Geometric Representation of Wavefront Distortion
TL;DR: In this paper, a statistical definition for the geometric shape of a randomly distorted wavefront was established and relationships between the phase-structure function and the statistics governing the shape were derived.
Journal ArticleDOI
Modulation Transfer Function Associated with Image Transmission through Turbulent Media
Robert E. Hufnagel,N. R. Stanley +1 more
TL;DR: In this article, the optical transfer function corresponding to the time-averaged image-degrading effects of atmospheric turbulence was determined, and quantitative predictions of image degradation were made and shown to agree with observed data.
Journal ArticleDOI
Power Loss in Propagation Through a Turbulent Medium for an Optical-Heterodyne System with Angle Tracking*
TL;DR: In this article, the power loss due to propagation through a turbulent medium is considered for an optical-heterodyne detection system whose axis tracks perfectly the instantaneous direction for maximum signal power.