scholarly journals Experimental validation of optimization concepts for focal-plane image processing with adaptive optics

2012 ◽  
Author(s):  
Visa Korkiakoski ◽  
Christoph U. Keller ◽  
Niek Doelman ◽  
Rufus Fraanje ◽  
Raluca Andrei ◽  
...  
Keyword(s):  
Image Processing ◽  
Adaptive Optics ◽  
Focal Plane ◽  
Experimental Validation ◽  
Plane Image

scholarly journals Coronagraphic phase diversity through residual turbulence: performance study and experimental validation

2019 ◽  
Vol 488 (3) ◽  
pp. 4307-4316 ◽  
Author(s):  
Olivier Herscovici-Schiller ◽  
Jean-François Sauvage ◽  
Laurent M Mugnier ◽  
Kjetil Dohlen ◽  
Arthur Vigan
Keyword(s):  
Numerical Simulations ◽  
Adaptive Optics ◽  
Focal Plane ◽  
Experimental Validation ◽  
Performance Study ◽  
Current Generation ◽  
Phase Diversity

Abstract Quasi-static aberrations in coronagraphic systems are the ultimate limitation to the capabilities of exoplanet imagers both ground-based and space-based. These aberrations – which can be due to various causes such as optics alignment or moving optical parts during the observing sequence – create light residuals called speckles in the focal plane. Those speckles might be mistaken for planets. For ground-based instruments, the presence of residual turbulent wavefront errors due to partial adaptive optics correction causes an additional difficulty to the challenge of measuring aberrations in the presence of a coronagraph. In this paper, we present an extension of COFFEE, the coronagraphic phase diversity, to the estimation of quasi-static aberrations in the presence of adaptive-optics-corrected residual turbulence. We perform realistic numerical simulations to assess the performance that can be expected on an instrument of the current generation. We perform the first experimental validation in the laboratory, which demonstrates that quasi-static aberrations can be corrected during the observations by means of coronagraphic phase diversity.

scholarly journals An Adaptive Steerable Imaging Array

1994 ◽  
Vol 158 ◽  
pp. 167-170
Author(s):  
E.K. Hege ◽  
J.R.P. Angel ◽  
A.D. Gleckler ◽  
K.P. Pflibsen ◽  
B.L. Ulich
Keyword(s):  
Adaptive Optics ◽  
Radio Telescope ◽  
Focal Plane ◽  
Image Formation ◽  
Optimized Design ◽  
Imaging Array ◽  
Plane Image ◽  
Mirror Telescope

We propose an optimized design for the redeployment of the Multiple Mirror Telescope (MMT) primary optics as a 25 m Adaptive Steerable Imaging Array (ASIA) providing direct focal plane image formation. The design incorporates concepts of active telescope alignment and adaptive optics proven in the existing MMT. Basing predictions on contemporary radio telescope mount technology, 45 m to 100 m optical baselines may be practical.

scholarly journals Update on focal-plane image processing research

1991 ◽  
Author(s):  
Sabrina E. Kemeny ◽  
Sayed I. Eid ◽  
Sunetra K. Mendis ◽  
Eric R. Fossum
Keyword(s):  
Image Processing ◽  
Focal Plane ◽  
Plane Image

An artificial retina chip with current-mode focal plane image processing functions

1997 ◽  
Vol 44 (10) ◽  
pp. 1777-1782 ◽  
Author(s):  
E. Funatsu ◽  
Y. Nitta ◽  
Y. Miyake ◽  
T. Toyoda ◽  
J. Ohta ◽  
...  
Keyword(s):  
Image Processing ◽  
Focal Plane ◽  
Current Mode ◽  
Artificial Retina ◽  
Plane Image ◽  
Retina Chip

Intelligent sensors research using pulse-coupled neural networks for focal plane image processing

1996 ◽  
Author(s):  
Gregory L. Tarr ◽  
Richard A. Carreras ◽  
Christopher R. DeHainaut ◽  
Xavier Clastres ◽  
Laurent Freyss ◽  
...  
Keyword(s):  
Neural Networks ◽  
Image Processing ◽  
Focal Plane ◽  
Coupled Neural Networks ◽  
Intelligent Sensors ◽  
Plane Image ◽  
Pulse Coupled Neural Networks

Analog 3-D Neuroprocessor for Fast Frame Focal Plane Image Processing

SIMULATION ◽  
1995 ◽  
Vol 65 (1) ◽  
pp. 11-25 ◽  
Author(s):  
Tuan Duong ◽  
Sabrina Kemeny ◽  
Taher Daud ◽  
Anil Thakoor ◽  
Chris Saunders ◽  
...  
Keyword(s):  
Image Processing ◽  
Focal Plane ◽  
Plane Image
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