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Proceedings Paper

Design of the fiber optic support system and fiber bundle accelerated life test for VIRUS
Author(s): Ian M. Soukup; Joseph H. Beno; Richard J. Hayes; James T. Heisler; Jason R. Mock; Nicholas T. Mollison; John M. Good; Gary J. Hill; Brian L. Vattiat; Jeremy D. Murphy; Seth C. Anderson; Svend M. Bauer; Andreas Kelz; Martin M. Roth; Eric P. Fahrenthold
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Paper Abstract

The quantity and length of optical fibers required for the Hobby-Eberly Telescope* Dark Energy eXperiment (HETDEX) create unique fiber handling challenges. For HETDEX‡, at least 33,600 fibers will transmit light from the focal surface of the telescope to an array of spectrographs making up the Visible Integral-Field Replicable Unit Spectrograph (VIRUS). Up to 96 Integral Field Unit (IFU) bundles, each containing 448 fibers, hang suspended from the telescope's moving tracker located more than 15 meters above the VIRUS instruments. A specialized mechanical system is being developed to support fiber optic assemblies onboard the telescope. The discrete behavior of 448 fibers within a conduit is also of primary concern. A life cycle test must be conducted to study fiber behavior and measure Focal Ratio Degradation (FRD) as a function of time. This paper focuses on the technical requirements and design of the HETDEX fiber optic support system, the electro-mechanical test apparatus for accelerated life testing of optical fiber assemblies. Results generated from the test will be of great interest to designers of robotic fiber handling systems for major telescopes. There is concern that friction, localized contact, entanglement, and excessive tension will be present within each IFU conduit and contribute to FRD. The test apparatus design utilizes six linear actuators to replicate the movement of the telescope over 65,000 accelerated cycles, simulating five years of actual operation.

Paper Details

Date Published: 20 July 2010
PDF: 12 pages
Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77354W (20 July 2010); doi: 10.1117/12.856968
Show Author Affiliations
Ian M. Soukup, The Univ. of Texas Ctr. for Electromechanics (United States)
Joseph H. Beno, The Univ. of Texas Ctr. for Electromechanics (United States)
Richard J. Hayes, The Univ. of Texas Ctr. for Electromechanics (United States)
James T. Heisler, The Univ. of Texas Ctr. for Electromechanics (United States)
Jason R. Mock, The Univ. of Texas Ctr. for Electromechanics (United States)
Nicholas T. Mollison, The Univ. of Texas Ctr. for Electromechanics (United States)
John M. Good, McDonald Observatory, The Univ. of Texas at Austin (United States)
Gary J. Hill, McDonald Observatory, The Univ. of Texas at Austin (United States)
Brian L. Vattiat, McDonald Observatory, The Univ. of Texas at Austin (United States)
Jeremy D. Murphy, The Univ. of Texas at Austin (United States)
Seth C. Anderson, The Univ. of Texas at Austin (United States)
Svend M. Bauer, Astrophysikalisches Institut Potsdam (Germany)
Andreas Kelz, Astrophysikalisches Institut Potsdam (Germany)
Martin M. Roth, Astrophysikalisches Institut Potsdam (Germany)
Eric P. Fahrenthold, The Univ. of Texas at Austin (United States)


Published in SPIE Proceedings Vol. 7735:
Ground-based and Airborne Instrumentation for Astronomy III
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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