scholarly journals SPARSE APERTURE SPECKLE INTERFEROMETRY TELESCOPE ACTIVE OPTICS CONTROL SYSTEM

2015 ◽  
Author(s):  
Matthew Clause
Keyword(s):  
Control System ◽  
Speckle Interferometry ◽  
Active Optics ◽  
Sparse Aperture

Ground demonstration of an optical control system for a space-based sparse-aperture telescope

1998 ◽  
Author(s):  
David B. DeYoung ◽  
James D. Dillow ◽  
Stephen P. Corcoran ◽  
Edwina V. Andrews ◽  
Julius Yellowhair ◽  
...  
Keyword(s):  
Control System ◽  
Optical Control ◽  
Sparse Aperture

scholarly journals A Finite Element Approach to the Design of the Support System for the ESO 1 M. Active Optics Experiment

1984 ◽  
Vol 79 ◽  
pp. 75-93 ◽  
Author(s):  
G. Ballio ◽  
R. Contro ◽  
C. Poggi ◽  
O. Citterio
Keyword(s):  
Finite Element ◽  
Control System ◽  
Support System ◽  
Closed Loop ◽  
New Technology ◽  
Active Optics ◽  
Finite Element Approach ◽  
Primary Mirror ◽  
Element Approach ◽  
Correction Terms

A way to follow in order to reduce the weight of the primary mirror is to accept an higher ratio diameter-thickness and to find a remedy to the consequent greater deformability of the mirror by an active control system of it. A technique using closed loop active optics control has been proposed in references.In these papers, a coherent scheme of active optics control for the ESO New Technology Telescope (NTT) was presented, based on analysis of the image errors in terms of an appropriate polynomial (the ESO off-line telescope test polynomial) and the production of equivalent correction terms by force modulation of the primary axial support.

Control system of position actuators for segmented mirror active optics in LAMOST

2007 ◽  
Author(s):  
Xixia Du ◽  
Zhenchao Zhang ◽  
Yongjun Qi ◽  
Aihua Li
Keyword(s):  
Control System ◽  
Active Optics ◽  
Segmented Mirror

Ground demonstration of an optical control system for a space-based sparse aperture telescope

1998 ◽  
Author(s):  
David B. DeYoung ◽  
James D. Dillow ◽  
Stephen P. Corcoran ◽  
Edwina V. Andrews ◽  
Julius Yellowhair ◽  
...  
Keyword(s):  
Control System ◽  
Optical Control ◽  
Sparse Aperture

Control system of a dispersed fringe type sensing system of active optics

2010 ◽  
Author(s):  
Yajun Zhang ◽  
Zhenchao Zhang ◽  
Yong Zhang
Keyword(s):  
Control System ◽  
Active Optics ◽  
Sensing System

A controller for safe, convenient operation of LaB6 emitters on electron-beam instruments

1983 ◽  
Vol 41 ◽  
pp. 408-409
Author(s):  
W. J. Abramson ◽  
H. W. Estry ◽  
L. F. Allard
Keyword(s):  
Electron Beam ◽  
Control System ◽  
Thermal Shock ◽  
Appropriate Care ◽  
Electron Guns ◽  
Tungsten Filaments ◽  
Order Of Magnitude ◽  
Main Components

LaB6 emitters are becoming increasingly popular as direct replacements for tungsten filaments in the electron guns of modern electron-beam instruments. These emitters offer order of magnitude increases in beam brightness, and, with appropriate care in operation, a corresponding increase in source lifetime. They are, however, an order of magnitude more expensive, and may be easily damaged (by improper vacuum conditions and thermal shock) during saturation/desaturation operations. These operations typically require several minutes of an operator's attention, which becomes tedious and subject to error, particularly since the emitter must be cooled during sample exchanges to minimize damage from random vacuum excursions. We have designed a control system for LaBg emitters which relieves the operator of the necessity for manually controlling the emitter power, minimizes the danger of accidental improper operation, and makes the use of these emitters routine on multi-user instruments.Figure 1 is a block schematic of the main components of the control system, and Figure 2 shows the control box.

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