![[M1 control tests]](25.gif) |
The crate with the active optics control electronics for M1 is being
tested on the cell and actuators.
|
![[M2/M3 crate]](M2CRATE2.GIF) |
The so-called M2/M3 crate, fixed to the centerpiece, contains also
other devices controls.
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The secondary mirror control system is based on an "exapod", formed by
six crossed elongable bars, which enables adjusting of position along three
axes. | ![[M2 exapod]](41.gif) |
![[M2 support]](../../publications/news/17/m2dum.gif) |
The piece holding the secondary mirror, with the counterweight
levers: the TNG can be moved in elevation in one direction only,
between +95 and +10 deg. |
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Mounting of the exapod system inside its spider at the top ring. |
![[Exapod mounting]](../../publications/news/17/exapod33.gif) |
![[M3 support]](39.gif) |
The tertiary mirror's support system with its piezoelectric motors can
oscillate the mirror with frequencies up to 15 Hz.
M3 can flip by 180 degrees to use both Nasmyth focal stations.
(Mirror dummies in orange). |
![[M3 controls]](m3dum2.gif) |
Closeup of the tertiary mirror's controls.
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