scholarly journals High-resolution speckle imaging through strong atmospheric turbulence

2016 ◽  
Vol 24 (11) ◽  
pp. 12116 ◽  
Author(s):  
Douglas A. Hope ◽  
Stuart M. Jefferies ◽  
Michael Hart ◽  
James G. Nagy
Keyword(s):  
High Resolution ◽  
Atmospheric Turbulence ◽  
Speckle Imaging

High Resolution Astrophysical Observations Using Speckle Imaging

1986 ◽  
Author(s):  
Robert W. Noyes ◽  
Peter Nisenson ◽  
Costas Papaliolios ◽  
Robert V. Stachnik
Keyword(s):  
High Resolution ◽  
Speckle Imaging

scholarly journals Evaluation of wake influence on high-resolution balloon-sonde measurements

2019 ◽  
Vol 12 (8) ◽  
pp. 4191-4210 ◽  
Author(s):  
Jens Söder ◽  
Michael Gerding ◽  
Andreas Schneider ◽  
Andreas Dörnbrack ◽  
Henrike Wilms ◽  
...  
Keyword(s):  
High Resolution ◽  
Uncertainty Analysis ◽  
Atmospheric Turbulence ◽  
Evaluation Tool ◽  
Turbulence Measurements ◽  
Wake Effects ◽  
Humidity Measurements ◽  
Average Probability ◽  
Vertical Winds

Abstract. Balloons are used for various in situ measurements in the atmosphere. On turbulence measurements from rising balloons there is a potential for misinterpreting wake-created fluctuations in the trail of the balloon for atmospheric turbulence. These wake effects have an influence on temperature and humidity measurements from radiosondes as well. The primary aim of this study is to assess the likelihood for wake encounter on the payload below a rising balloon. Therefore, we present a tool for calculating this probability based on radiosonde wind data. This includes a retrieval of vertical winds from the radiosonde and an uncertainty analysis of the wake assessment. Our wake evaluation tool may be used for any balloon–gondola distance and provides a significant refinement compared to existing assessments. We have analysed wake effects for various balloon–gondola distances applying atmospheric background conditions from a set of 30 radiosondes. For a standard radiosonde we find an average probability for wake encounter of 28 %, pointing out the importance of estimating wake effects on sounding balloons. Furthermore, we find that even millimetre-sized objects in the payload can have significant effects on high-resolution turbulence measurements, if they are located upstream of the turbulence sensor.

High Resolution Solar Speckle Imaging With the Extended Knox–Thompson Algorithm

Solar Physics ◽  
2006 ◽  
Vol 235 (1-2) ◽  
pp. 31-53 ◽  
Author(s):  
K. Mikurda ◽  
O. Von Der Lühe
Keyword(s):  
High Resolution ◽  
Speckle Imaging

scholarly journals Speckle Interferometry, Speckle Masking, Speckle Spectroscopy and Speckle Frame Selection

1984 ◽  
Vol 79 ◽  
pp. 337-345 ◽  
Author(s):  
Gerd Weigelt
Keyword(s):  
High Resolution ◽  
Speckle Interferometry ◽  
Large Telescope ◽  
Speckle Imaging ◽  
Frame Selection ◽  
Very Large Telescope

AbstractHigh-resolution speckle imaging is one of the most fascinating possibilities of a Very Large Telescope (VLT). Various speckle methods can yield a resolution of about 0.01" with a 8-m to 10-m VLT. As exiting as the resolution is the limiting magnitude of the speckle methods. The limiting magnitude is extremely seeingdependent. The following limiting magnitudes are possible with speckle interferometry, speckle masking and speckle spectroscopy:4" seeing: limiting magnitude 152" seeing: limiting magnitude 17.51" seeing: limiting magnitude 20 (!)

Optical Aperture Synthesis with the Anglo-Australian Telescope

1989 ◽  
Vol 8 (1) ◽  
pp. 78-80 ◽  
Author(s):  
T. R. Bedding ◽  
J. G. Robertson
Keyword(s):  
High Resolution ◽  
Atmospheric Turbulence ◽  
Aperture Synthesis ◽  
Interferometric Imaging ◽  
Optical Interferometer ◽  
Optical Aperture ◽  
High Resolution Images ◽  
Pupil Plane

AbstractWe propose to construct an optical interferometer to produce high resolution images by aperture synthesis. The interferometer, known as the Masked Aperture Pupil-Plane Interference Telescope (MAPPIT), will be mounted at the coudé focus of the Anglo-Australian Telescope. It will use a non-redundant aperture mask, together with closure phase methods developed for radio VLBI, to overcome the wavefront distortions which are introduced by atmospheric turbulence. By using the techniques of pupil-plane interferometry and wavelength dispersion, it is hoped that MAPPIT will have more sensitivity than many other interferometric imaging projects.

scholarly journals High-resolution speckle imaging

Physics Today ◽  
2018 ◽  
Vol 71 (11) ◽  
pp. 78-79 ◽  
Author(s):  
Steve B. Howell ◽  
Elliott P. Horch
Keyword(s):  
High Resolution ◽  
Speckle Imaging
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