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Proceedings Paper

Chopping Secondary Mirror For The ESO 3.6m Telescope
Author(s): A. van Dijsseldonk; A. F.M. Moorwood
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Paper 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.

Paper Details

Date Published: 1 January 1987
PDF: 7 pages
Proc. SPIE 0817, Optomechanical Systems Engineering, (1 January 1987); doi: 10.1117/12.967409
Show Author Affiliations
A. van Dijsseldonk, European Southern Observatory (Germany)
A. F.M. Moorwood, European Southern Observatory (Germany)

Published in SPIE Proceedings Vol. 0817:
Optomechanical Systems Engineering
Daniel Vukobratovich, Editor(s)

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