An active telescope secondary mirror control system

1999 ◽  
Vol 70 (6) ◽  
pp. 2856-2860 ◽  
Author(s):  
Favio Bortoletto ◽  
Carlotta Bonoli ◽  
Daniela Fantinel ◽  
Daniele Gardiol ◽  
Claudio Pernechele
Keyword(s):  
Control System ◽  
Secondary Mirror

Control system of the VLT secondary mirror unit

1998 ◽  
Author(s):  
Joerg Flemmig ◽  
Gerald Praeger ◽  
Karsten Baumann
Keyword(s):  
Control System ◽  
Secondary Mirror

A Microprocessor-Based Position Control System for a Telescope Secondary Mirror

1983 ◽  
Vol 16 (11) ◽  
pp. 1-13
Author(s):  
K.R. Lorell ◽  
R.R. Clappier ◽  
W.F. Barrows ◽  
G.K. Lee
Keyword(s):  
Control System ◽  
Position Control ◽  
Secondary Mirror ◽  
Position Control System

VLT DSM, the control system of the largest deformable secondary mirror ever manufactured

2014 ◽  
Author(s):  
Mauro Manetti ◽  
Marco Morandini ◽  
Paolo Mantegazza ◽  
Roberto Biasi ◽  
Mario Andrighettoni ◽  
...  
Keyword(s):  
Control System ◽  
Secondary Mirror

A microprocessor-based position control system for a telescope secondary mirror

Automatica ◽  
1984 ◽  
Vol 20 (3) ◽  
pp. 295-308 ◽  
Author(s):  
K.R. Lorell ◽  
R.R. Clappier ◽  
W.F. Barrows ◽  
G.K. Lee
Keyword(s):  
Control System ◽  
Position Control ◽  
Secondary Mirror ◽  
Position Control System

Test and performance evaluation of the Gemini secondary mirror chopper and position control system

1998 ◽  
Author(s):  
Kenneth R. Lorell ◽  
Jean-Noel Aubrun ◽  
Ernesto O. Perez ◽  
Paul J. Reshatoff, Jr. ◽  
Donald F. Zacharie
Keyword(s):  
Performance Evaluation ◽  
Control System ◽  
Position Control ◽  
Secondary Mirror ◽  
And Performance ◽  
Position Control 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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