Back to Volume
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).
Back to Volume