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| Paper: |
KPNO 4-meter Active Primary - Software |
| Volume: |
216, Astronomical Data Analysis Software and Systems IX |
| Page: |
385 |
| Authors: |
Mills, D.; Claver, C. |
| Abstract: |
A software system for active control of the KPNO 4-meter primary mirror is presented. The system consists of an embedded PC running RT-Linux, controlling a set of A/D and D/A modules. The support pad pressures at 33 points on the mirror can be maintained to within 0.03 psi of the ``ideal'' as the telescope tracks across the sky. The mirror figure is automatically adjusted by referring to a set of look-up-tables, but can also be ``tuned'' by measuring and correcting for the current wavefront error (using either science imager data, or a dedicated wavefront camera). |
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