1 January 1987 Chopping Secondary Mirror For The ESO 3.6m Telescope
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Abstract
A chopping secondary mirror system is at present in use at ESO's 3.6m telescope for the cancellation of the sky- and telescope background emission and its variations. The chopper system achieves: - square wave and sawtooth chopping with amplitudes up to 10 arcmin and frequencies from 0-40 Hz, - stability of <1 arcsec ( <.2 on sky) in flat part of waveform, - risetime of about 6 msec, - flexure of <7.5 arcmin for any 30 degree tilt, - no vibrations induced in or transmitted to the rest of the mechanics (telescope). The chopper system is attached to a subsystem which enables the mirror to be rotated and focussed. The mechanics, optics and electronic control of the system are described and its performance is presented.
© (1987) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
A. van Dijsseldonk, A. van Dijsseldonk, A. F.M. Moorwood, A. F.M. Moorwood, } "Chopping Secondary Mirror For The ESO 3.6m Telescope", Proc. SPIE 0817, Optomechanical Systems Engineering, (1 January 1987); doi: 10.1117/12.967409; https://doi.org/10.1117/12.967409
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