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Proceedings Paper

Automated Multislit Unit For The 2.5M Isaac Newton Telescope
Author(s): J. M. Breare; R S. Ellis; A.. Purvis; W. Miller; D. A. Webb
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Paper Abstract

A multislit unit is being constructed for use with spectrographs on the 2.5m telescope at the Observatorio del Roque de los Muchachos. It will make possible the simultaneous observation of up to 12 spectra. The complete unit will fit into the available space on the telescope as a replacement for the conventional slit assembly. The area of the focal plane over which the slits move is 40x3Omm, corresponding to 4x3 arc min at the f/15 cassegrain focus. Each slit has length 2mm and can be set to within 18 microns of the required position. The slits are moved in the dispersion direction by wires pulled by linear actuators. The position of a slit is encoded from the voltage on an accurate potentiometer connected to the wire. Control is by a 6809 microprocessor which continuously monitors the position of each slit and adjusts it if necessary. The telescope main instrument computer will be used to translate object coordinates into encoded positions.

Paper Details

Date Published: 13 October 1986
PDF: 4 pages
Proc. SPIE 0627, Instrumentation in Astronomy VI, (13 October 1986); doi: 10.1117/12.968101
Show Author Affiliations
J. M. Breare, Durham University (United Kingdom)
R S. Ellis, Durham University (United Kingdom)
A.. Purvis, Durham University (United Kingdom)
W. Miller, Institute of Nuclear Studies (Poland)
D. A. Webb, Teesside Polytechnic (United Kingdom)

Published in SPIE Proceedings Vol. 0627:
Instrumentation in Astronomy VI
David L. Crawford, Editor(s)

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