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Proceedings Paper

An adjustable slit mechanism for a fiber-fed multi-object spectrograph
Author(s): John I. Bailey III; Mario L. Mateo; Alan P. Bagish; Jeffrey D. Crane; Colin T. Slater
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Paper Abstract

Fiber-fed multi-object spectrographs have greatly enhanced the spectroscopic capabilities of the world's premiere telescopes, but their flexibility has typically been limited by a fixed effective slit size that constrains the available resolving power. We present a novel mechanism that, for the first time, equips a fiber-fed spectrograph with multiple discreet slits of different widths. In this paper, we detail the mechanical design of our variable slit mechanism, which is capable of positioning any one of six slits in front of the fibers immediately prior to injection into the spectrograph's optical train. Further, we present the details of related systems necessary to achieve closed loop positioning of the slit mechanism given that no encoder is used. We also briefly discuss our use of open source and open hardware projects in the design. Finally, we describe the control system we have implemented for this subsystem.

Paper Details

Date Published: 24 September 2012
PDF: 7 pages
Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84465G (24 September 2012); doi: 10.1117/12.925735
Show Author Affiliations
John I. Bailey III, Univ. of Michigan (United States)
Mario L. Mateo, Univ. of Michigan (United States)
Alan P. Bagish, Carnegie Observatories (United States)
Jeffrey D. Crane, Carnegie Observatories (United States)
Colin T. Slater, Univ. of Michigan (United States)

Published in SPIE Proceedings Vol. 8446:
Ground-based and Airborne Instrumentation for Astronomy IV
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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