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Proceedings Paper

Image motion and flexure compensation of the FORS spectrographs
Author(s): Harald E. Nicklas; Hermann Boehnhardt; Walter Fuertig; Reiner Harke; Hans-Joachim Hess; Peter Juergens; Bernard Muschielok; Walter Seifert; Otmar Stahl; Karl Tarantik
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Paper Abstract

One of the most critical issues in designing a spectrograph is the motion of opto-mechanical components due to flexure especially when it will be mounted to the Cassegrain focus of a telescope. Image motion on the detector has to be kept small in order not to affect the value of the scientific data. The FORS spectrographs fulfil those requirements by a proper design and by a passive compensation of the instrumental flexure. Image motion of the 2 metric tons instrument could be reduced in this way to a tiny fraction of one pixel's size thus not affecting the data gathered with those spectrographs. It is tested and approved at a telescope simulator that all specifications regarding those motions are fully met. A fine tuning flexure compensation is built into the spectrograph's design and is tested on its tuning range which allows to adapt the compensation to effects eventually caused by the Cassegrain flange of the telescope.

Paper Details

Date Published: 9 July 1998
PDF: 12 pages
Proc. SPIE 3355, Optical Astronomical Instrumentation, (9 July 1998); doi: 10.1117/12.316810
Show Author Affiliations
Harald E. Nicklas, Univ.-Sternwarte/Georg-August-Univ. Goettingen (Germany)
Hermann Boehnhardt, Univ.-Sternwarte/Ludwig-Maximilians-Univ. Muenchen (Chile)
Walter Fuertig, Landessternwarte Heidelberg (Germany)
Reiner Harke, Univ.-Sternwarte/Georg-August-Univ. Goettingen (Germany)
Hans-Joachim Hess, Univ.-Sternwarte/Ludwig-Maximilians-Univ. Muenchen (Germany)
Peter Juergens, Univ.-Sternwarte/Georg-August-Univ. Goettingen (Germany)
Bernard Muschielok, Univ.-Sternwarte/Ludwig-Maximilians-Univ. Muenchen (Germany)
Walter Seifert, Landessternwarte Heidelberg (Germany)
Otmar Stahl, Landessternwarte Heidelberg (Germany)
Karl Tarantik, Univ.-Sternwarte/Ludwig-Maximilians-Univ. Muenchen (Germany)

Published in SPIE Proceedings Vol. 3355:
Optical Astronomical Instrumentation
Sandro D'Odorico, Editor(s)

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