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27 August 1999 Adaptive control of VLT M2 unit high-precision chopping mechanism
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Abstract
The VLT M2 Unit is an optomechanical system constituted by the M2 mirror and the mechanism used to control its position and orientation along 5 degrees of freedom. Of these the control and design of the tilt/chopping stage is the most challenging one. The tilt/chopping stage influences the pointing of the telescope' LOS, especially to allow observation in the IR range. This is achieved by chopping the M2 mirror up to 10 times per second with a maximum throw of 120 arcsec about an arbitrary axis. During this chopping the 'residual forces' are introduced into the telescope structure. The acceptance tests of the first M2 units showed, that the residual forces excited some resonances of the telescope structure and the performance requirements were not met in the beginning. DSS developed an adaptive control that is able to minimize the amount of residual forces automatically during chopping. This presentation is focused on the developed Adaptive Control and its results shown up during the acceptance test for unit 02. The finally achieved performance and the gained experience are presented.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Karsten Baumann and Joerg Flemmig "Adaptive control of VLT M2 unit high-precision chopping mechanism", Proc. SPIE 3737, Design and Engineering of Optical Systems II, (27 August 1999); https://doi.org/10.1117/12.360057
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