Journal ArticleDOI
Stellar scintillation technique for the measurement of tilt anisoplanatism
Kim A. Winick,D. vL. Marquis +1 more
- Vol. 5, Iss: 11, pp 1929-1936
TLDR
The significance of tilt anisoplanatism is established, and a measurement theory, based on aperture-averaging intensity scintillation, is developed in this article, which is a direct extension of the technique currently used to determine the isoplanatic angle as defined by Fried et al.Abstract:
The significance of tilt anisoplanatism is established, and a measurement theory, based on aperture-averaging intensity scintillation, is developed. The theory is a direct extention of the technique currently used to determine the isoplanatic angle as defined by Fried
[ J. Opt. Soc. am.72, 52 ( 1982)]. By using this theory, a physically realizable binary aperture-weighting function is derived for a particular case of interest. It is noted that direct quantitative measurements of tilt anisoplanatism can also be made, under specific circumstances, by tracking the relative centroid motion of a binary star pair. Thus independent verification of the remote-sensing theory for tilt anisoplanatism, based on aperture-averaging scintillation measurements, should be possible.read more
Citations
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Journal ArticleDOI
Simulation of anisoplanatic imaging through optical turbulence using numerical wave propagation with new validation analysis
Russell C. Hardie,Jonathan D. Power,Daniel A. LeMaster,Douglas R. Droege,Szymon Gladysz,Santasri R. Bose-Pillai +5 more
TL;DR: I think this tool can be used effectively to study optical anisoplanatic turbulence and to aid in the development of image restoration methods.
Proceedings ArticleDOI
Estimation of the path-averaged atmospheric refractive index structure constant from time-lapse imagery
TL;DR: In this article, a technique for estimating the path-averaged C 2n from the random component of the image motion is presented, which uses a derived set of weighting functions that depend on the size of the imaging aperture and the patch size in the image whose motion is being tracked.
Journal ArticleDOI
High-resolution imaging at low-light levels through weak turbulence
TL;DR: In this article, measurements of an object viewed at low-light levels through weak atmospheric turbulence are modeled mathematically as a time-space doubly stochastic Poisson process in which the intensity function moves randomly in time but is otherwise undistorted.
Journal ArticleDOI
Estimation of atmospheric turbulence using differential motion of extended features in time-lapse imagery
Santasri R. Bose-Pillai,Jack E. McCrae,Christopher A. Rice,Ryan A. Wood,Ryan A. Wood,Ryan A. Wood,Connor E. Murphy,Connor E. Murphy,Connor E. Murphy,Steven T. Fiorino +9 more
TL;DR: A method to estimate turbulence parameters, such as path weighted Cn2 and Fried’s coherence diameter r0 from turbulence-induced random, differential motion of extended features in the time-lapse imagery of a distant target is presented.
Journal ArticleDOI
Estimation of turbulence from time-lapse imagery
TL;DR: In this article, a modified version of this approach that creates larger patches by averaging several smaller patches together solves this noise issue, and the weighting functions for a number of different patch sizes can be combined through the Moore-Penrose pseudoinverse to create a weighting function that yields the least-squares optimal linear combination of measurements for the estimation of r0.
References
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Journal ArticleDOI
Optical Resolution Through a Randomly Inhomogeneous Medium for Very Long and Very Short Exposures
TL;DR: 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.
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
Anisoplanatism in adaptive optics
TL;DR: In this article, the effect of turbulence-induced wavefront distortion for two propagation paths with only slightly different propagation directions can be significantly different, and the implications of this fact for a compensated imaging system and for an adaptive-optics laser transmitter are examined.