Detailed design of the G-CLEF flexure control camera subsystem

Jae Sok Oh; Chan Park; Kang-Min Kim; Moo-Young Chun; Young Sam Yu; Sungho Lee; Jihun Kim; Ueejeong Jeong; Chang-Hee Kim; Andrew Szentgyorgyi; Stuart McMuldroch; William Podgorski; Ian Evans; Mark Mueller; Alan Uomoto; Jeffrey Crane; Tyson Hare

doi:10.1117/12.2311908

11 July 2018 Detailed design of the G-CLEF flexure control camera subsystem

Jae Sok Oh, Chan Park, Kang-Min Kim, Moo-Young Chun, Young Sam Yu, Sungho Lee, Jihun Kim, Ueejeong Jeong, Chang-Hee Kim, Andrew Szentgyorgyi, Stuart McMuldroch, William Podgorski, Ian Evans, Mark Mueller, Alan Uomoto, Jeffrey Crane, Tyson Hare

Author Affiliations +

Proceedings Volume 10702, Ground-based and Airborne Instrumentation for Astronomy VII; 107028X (2018) https://doi.org/10.1117/12.2311908
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

The GMT-Consortium Large Earth Finder (G-CLEF) is one of the first instrument for the Giant Magellan Telescope (GMT). The G-CLEF is a fiber fed, optical band echelle spectrograph that is capable of extremely precise radial velocity measurement. The G-CLEF Flexure Control Camera (FCC) is included as a part in the G-CLEF Front End Assembly (GCFEA), which monitors the field images focused on a fiber mirror to control the flexure and the focus errors within the GCFEA. The five optical components constituting the FCC are aligned on a common optical bench. The order of the optical train is: a collimator, neutral density filters, a focus analyzer, a reimaging camera barrel, and a detector module. The collimator receives the beam reflected by the fiber mirror and consists of a triplet lens. The neutral density filters are located just after the collimator to make it possible a broad range star brightness as a target or a guide. The tent prism focus analyzer is positioned at a pupil produced by the collimator and is used to measure a focus offset. The reimaging camera barrel includes two pairs of doublet lenses to focus the beam onto the CCD focal plane. The detector module is composed of a linear translator and a field de-rotator. In this article, we present the optical and mechanical detailed designs of the G-CLEF FCC.

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Jae Sok Oh, Chan Park, Kang-Min Kim, Moo-Young Chun, Young Sam Yu, Sungho Lee, Jihun Kim, Ueejeong Jeong, Chang-Hee Kim, Andrew Szentgyorgyi, Stuart McMuldroch, William Podgorski, Ian Evans, Mark Mueller, Alan Uomoto, Jeffrey Crane, and Tyson Hare "Detailed design of the G-CLEF flexure control camera subsystem", Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 107028X (11 July 2018); https://doi.org/10.1117/12.2311908

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KEYWORDS

Collimators

Optical benches

Cameras

Mirrors

CCD cameras

Optical filtering

Sensors

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