AAS Meeting #193 - Austin, Texas, January 1999
Session 10. The Hobby*Eberly Telescope
Display, Wednesday, January 6, 1999, 9:20am-6:30pm, Exhibit Hall 1

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[10.06] Optical Fiber Evaluation for the Hobby-Eberly Telescope

K. McGouldrick, J. Maywalt, L. Engel, B. Rhoads, D. R. Andersen, L. W. Ramsey (Penn State University)

Two major facility instruments on the Hobby-Eberly telescope (HET) are fiber coupled: the high and medium resolution spectrographs. Understanding the behavior of the fibers with the HET is central to understanding the performance of the telescope/spectrograph system. We will describe the Penn State fiber evaluation facility which enables us to measure focal ratio degradation (FRD) and total throughput. We will present some typical data obtained using the HET focal ratio at the fiber input. The HET design has a roving pupil that changes the illumination pattern somewhat during the typical 1 hour tracking time on a target. We will describe our plans to simulate the HET input test the degree to which the varying pupil is scrambled by the fiber.


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