scholarly journals Implications of Atmospheric Differential Refraction for Adaptive Optics Observations

2002 ◽  
Vol 114 (794) ◽  
pp. 450-461 ◽  
Author(s):  
Henry G. Roe
Keyword(s):  
Adaptive Optics ◽  
Differential Refraction

Accounting for mirror dynamics in optimal Adaptive Optics control

2009 ◽  
Author(s):  
Carlos Correia ◽  
Henri-Francois Raynaud ◽  
Caroline Kulcsar ◽  
Jean-Marc Conan
Keyword(s):  
Adaptive Optics

The Condition for Absolute Stability of an Electroelastic Actuator Control System for Nanomechatronics

2020 ◽  
Vol 10 (10) ◽  
pp. 52-58
Author(s):  
Sergey M. AFONIN ◽  
Keyword(s):  
Control System ◽  
Adaptive Optics ◽  
Absolute Stability ◽  
Deformation Characteristic ◽  
Straight Line Segment ◽  
Control Mechanisms ◽  
Relative Width ◽  
Random Inputs ◽  
Deformation Control ◽  
Actuator Control

An electroelastic actuator for nanomechatronics is used in nanotechnology, adaptive optics, microsurgery, microelectronics, and biomedicine to actuate or control mechanisms, systems based on the electroelastic effect, and to convert electrical signals into mechanical displacements and forces. In nanomechatronic systems, a piezoactuator is used in scanning microscopy, laser systems, in astronomy for precision alignment, for compensation of temperature, gravitational deformations and atmospheric turbulence, focusing, and stabilizing the image. In this study, a condition for absolute stability of an electroelastic actuator control system for nanomechatronics under deterministic and random inputs is obtained. A number of equilibrium positions in an electroelastic actuator mechatronic control system are found, the totality of which is represented by a straight line segment. The electroelastic actuator’s deformation control system dead band relative width is determined for the actuator’s symmetric and asymmetric hysteresis characteristics. Under deterministic inputs and with fulfilling the condition for the derivative of the nonlinear hysteresis actuator deformation characteristic, the set of equilibrium positions of the electroelastic actuator control system for nanomechatronics is absolutely stable. Under random inputs, the system absolute stability with respect to the mathematical expectations of the electroelastic actuator mechatronic control system equilibrium positions has been determined subject to fulfilling the condition on the derivative of the actuator hysteresis characteristic.

Develop Techniques for Ion Implantation of PLZT for Adaptive Optics

1989 ◽  
Author(s):  
R. A. Craig ◽  
C. R. Batishko ◽  
J. L. Brimhall ◽  
W. T. Pawlewicz ◽  
K. A. Stahl ◽  
...  
Keyword(s):  
Ion Implantation ◽  
Adaptive Optics

Diode Laser Scaling Using Unconventional Adaptive Optics

1991 ◽  
Author(s):  
W. J. Gignac ◽  
R. R. Stephens ◽  
A. A. Narayanan ◽  
R. R. Craig ◽  
H. W. Yen
Keyword(s):  
Diode Laser ◽  
Adaptive Optics
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