Results 211 to 220 of about 15,284 (261)
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Isoplanatism in a multiconjugate adaptive optics system
Journal of the Optical Society of America A, 2000Turbulence correction in a large field of view by use of an adaptive optics imaging system with several deformable mirrors (DM's) conjugated to various heights is considered. The residual phase variance is computed for an optimized linear algorithm in which a correction of each turbulent layer is achieved by applying a combination of suitably smoothed ...
A, Tokovinin, M, Le Louarn, M, Sarazin
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2012
This chapter presents an overview of adaptive optics (AO) systems, including a brief summary of their development history and their importance in high-resolution imaging systems. The first section of this chapter introduces the basic optical concepts of wavefronts and aberrations.
Zhizheng Wu +2 more
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This chapter presents an overview of adaptive optics (AO) systems, including a brief summary of their development history and their importance in high-resolution imaging systems. The first section of this chapter introduces the basic optical concepts of wavefronts and aberrations.
Zhizheng Wu +2 more
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Adaptive optical processing system with optical associative memory
Applied Optics, 1993An architecture for a novel adaptive optical processing system using optical associative memory with learning capability is proposed. The optical system consists of an optical preprocessor for feature extraction and optical associative memory. The feature-extraction ability can give excellent processing capability to the optical associative memory.
H, Toyoda +3 more
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Adaptive and Real-time Optimal Control for Adaptive Optics Systems
European Journal of Control, 2009zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Doelman, N.J. +3 more
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Sparse calibration of an extreme Adaptive Optics system
49th IEEE Conference on Decision and Control (CDC), 2010Adaptive optics systems are extensively used in astronomy to obtain high resolution pictures of stars and galaxies with ground telescopes. The crucial point is to shape deformable mirrors in order to compensate for the incoming wave distorted by the atmospheric turbulence. The calibration of the system is the cornerstone to obtain good performance. The
Alessandro Chiuso +2 more
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Dual-wavelength adaptive optical systems
Applied Optics, 1983A method for decomposition of phase difference error between measurements of atmospheric turbulence-induced phase distortion at two different wavelengths is described. Calculations are made of the phase difference errors in the first five Zernike radial modes for both ground-to-ground and ground-to-space transmission of laser radiation.
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Discrete-Time Model of an Adaptive Optics System
2007 American Control Conference, 2007The standard adaptive optics system can be viewed as a sampled-data feedback system with a continuous-time disturbance (the incident wavefront from the observed object) and discrete-time measurement noise. A common measure of the performance of adaptive optics systems is the time average of the pupil variance of the residual wavefront. This performance
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The GMT adaptive optics system
SPIE Proceedings, 2010The design of the adaptive optics (AO) system for the GMT is currently being developed. The baseline system is planned around a segmented adaptive secondary mirror (ASM), with elements similar in size to current ASM's for 8 m telescopes. A facility wavefront sensing system is planned to provide AO correction at several science instrument ports.
Philip M. Hinz +6 more
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Adaptive optics system simulator
Optics & Laser Technology, 2018Abstract In this paper we present the development of a computational tool that simulates the behavior of the basic devices in an adaptive optics system. These elements are a deformable mirror, a Shack-Hartmann wavefront sensor and a basic control system.
M.A. Betanzos-Torres +3 more
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A simplified adaptive optics system
SPIE Proceedings, 2003Affordable adaptive optics on small telescopes allow to introduce the technology to a large community and provide opportunities to train new specialists in the field. We have developed a low order, low cost adaptive optics system for the 1.6m telescope of the Mont Megantic Observatory.
Liviu Ivanescu +2 more
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