20
o
Frames to Average Over
Determines the level of running averaging for
centroid locations used in the control algorithm. As with Loop Gain, it is
recommended that one start with the default value and adjust it to achieve
a well-behaved (no ringing, relatively fast) return of the beam to the Inner
Target. A higher value may slow loop response but may improve
performance overall.
o
Acquire Motion Matrix
Click this button to initiate the routine to acquire
the Motion Matrix. This only needs to be done during the initial system set
up. This routine can take several minutes.
Figure 17. Example physical layout of mirrors and cameras for GuideStar II
system.
o
Manual Picomotor Controls
The pair of four arrows with buttons
provide manual control of the Picomotors. These can be used to manually
position the beams during set up, and also to test the response of the
control loop. By pressing a button while Lock is on, the dynamic
performance of the loop can be evaluated. Set the Manual Step Size such
that clicking an arrow will take the beams out of the Outer Target area.
Ideally the beams will return to their targets in a relatively fast and well-
behaved manner. This is a useful test when adjusting the Motion Settings
(see below) to optimize loop performance.
To close the Motion Settings window, click on the OK button.
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