Characterization of deformable mirrors for high-order adaptive optics systems

2004 ◽  
Author(s):  
Remko Stuik ◽  
Stefan Hippler ◽  
Markus Feldt ◽  
Jesus Aceituno ◽  
Sebastian E. Egner
Keyword(s):  
Adaptive Optics ◽  
High Order ◽  
Deformable Mirrors

Characterization of an off-the-shelf detector for high-order wavefront sensing in solar adaptive optics

2012 ◽  
Author(s):  
Luke C. Johnson ◽  
K. Richards ◽  
F. Wöger ◽  
Samuel Barden ◽  
T. Rimmele
Keyword(s):  
Adaptive Optics ◽  
High Order ◽  
Wavefront Sensing

Characterization of ALPAO deformable mirrors for the NAOMI VLTI Auxiliary Telescopes adaptive optics

2018 ◽  
Author(s):  
Jean-Baptiste Le Bouquin ◽  
Jean-Philippe Berger ◽  
Sylvain Rochat ◽  
Laurent Jocou ◽  
Thibaut Moulin ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Deformable Mirrors

Large-Stroke MEMS Deformable Mirrors for Adaptive Optics

2006 ◽  
Vol 15 (3) ◽  
pp. 572-583 ◽  
Author(s):  
D.J. Dagel ◽  
W.D. Cowan ◽  
O.B. Spahn ◽  
G.D. Grossetete ◽  
A.J. Grine ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Deformable Mirrors

Characteristics in Response Integration and Bifurcation of a Forced Duffing Oscillator

2007 ◽  
Author(s):  
Jang-Der Jeng ◽  
Yuan Kang ◽  
Yeon-Pun Chang ◽  
Shyh-Shyong Shyr
Keyword(s):  
Applied Sciences ◽  
Phase Plane ◽  
Duffing Oscillator ◽  
High Order ◽  
Chaotic Motions ◽  
Integration Algorithm ◽  
High Order Harmonic ◽  
Stiffness And Damping

The Duffing oscillator is well-known models of nonlinear system, with applications in many fields of applied sciences and engineering. In this paper, a response integration algorithm is proposed to analyze high-order harmonic and chaotic motions in this oscillator for modeling rotor excitations. This method numerically integrates the distance between state trajectory and the origin in the phase plane during a specific period and predicted intervals with excitation periods. It provides a quantitative characterization of system responses and can replace the role of the traditional stroboscopic technique (Poincare´ section method) to observe bifurcations and chaos of the nonlinear oscillators. Due to the signal response contamination of system, thus it is difficult to identify the high-order responses of the subharmonic motion because of the sampling points on Poincare´ map too near each other. Even the system responses will be made misjudgments. Combining the capability of precisely identifying period and constructing bifurcation diagrams, the advantages of the proposed response integration method are shown by case studies. Applying this method, the effects of the change in the stiffness and the damping coefficients on the vibration features of a Duffing oscillator are investigated in this paper. From simulation results, it is concluded that the stiffness and damping of the system can effectively suppress chaotic vibration and reduce vibration amplitude.

Real-time characterization of the spatio-temporal dynamics of deformable mirrors

2016 ◽  
Author(s):  
James Kilpatrick ◽  
Adela Apostol ◽  
Anatoliy Khizhnya ◽  
Vladimir Markov ◽  
Leonid Beresnev
Keyword(s):  
Real Time ◽  
Temporal Dynamics ◽  
Deformable Mirrors ◽  
Spatio Temporal

scholarly journals On accurate high-order numerical derivatives computations for quantum chemistry purposes

2018 ◽  
Keyword(s):  
Quantum Chemistry ◽  
Finite Field ◽  
Numerical Differentiation ◽  
Field Method ◽  
High Order ◽  
Parameter Choice ◽  
Derivatives Of ◽  
Finite Field Method ◽  
Account Electron

Various molecular parameters in quantum chemistry could be computed as derivatives of energy over different arguments. Unfortunately, it is quite complicated to obtain analytical expression for characteristics that are of interest in the framework of methods that account electron correlation. Especially it relates to the coupled cluster (CC) theory. In such cases, numerical differentiation comes to rescue. This approach, like any other numerical method has empirical parameters and restrictions that require investigation. Current work is called to clarify the details of Finite-Field method usage for high-order derivatives calculation in CC approaches. General approach to the parameter choice and corresponding recommendations about numerical steadiness verification are proposed. As an example of Finite-Field approach implementation characterization of optical properties of fullerene passing process through the aperture of carbon nanotorus is given.

Laboratory characterization of a Foucault-like wavefront sensor for adaptive optics

1998 ◽  
Author(s):  
Armando Riccardi ◽  
N. Bindi ◽  
Roberto Ragazzoni ◽  
Simone Esposito ◽  
Paolo Stefanini
Keyword(s):  
Adaptive Optics ◽  
Wavefront Sensor ◽  
Laboratory Characterization
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