Share Email Print
cover

Proceedings Paper

Design and performance characterization of the LCOGTN One-Meter Telescope optical tube assembly
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

Scientific performance specifications, a necessity for ease of commissioning and minimal maintenance, and a desire for automated sensing and remote collimation have led to novel designs and features in LCOGT's one-meter Optical Tube Assembly (OTA). We discuss the design and performance of the quasi-RC optical system with 18 point whiffletree and radial hub mount. Position probes and IR temperature sensors on the primary and secondary mirrors give feedback for active collimation and thermal control. A carbon fiber/epoxy composite truss, with unique spherical node connections, mounts to parallel and offset Invar vanes. A flexure based, closed loop, 3-DOF secondary mirror mechanism is used for tip/tilt collimation. The optics and deflections of the OTA components were iteratively designed for passive collimation with a changing gravity vector. We present the FEA predictions, measured deflections, and measured hysteresis for many of the components. Vibration modes, amplitudes, and damping of the system are presented with an FFT frequency analysis. Thermal CTE effects on loading and focal position are quantified. All of these system effects are then related to the overall scientific performance of the 1.0 m telescope.

Paper Details

Date Published: 22 July 2010
PDF: 15 pages
Proc. SPIE 7739, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation, 77391S (22 July 2010); doi: 10.1117/12.857809
Show Author Affiliations
Benjamin J. Haldeman, Las Cumbres Observatory, Global Telescope Network (United States)
Rachel M. Haynes, Las Cumbres Observatory, Global Telescope Network (United States)
Vincent Posner, Las Cumbres Observatory, Global Telescope Network (United States)
Joseph R. Tufts, Las Cumbres Observatory, Global Telescope Network (United States)
Andrew J. Pickles, Las Cumbres Observatory, Global Telescope Network (United States)
Matthew A. Dubberley, Las Cumbres Observatory, Global Telescope Network (United States)


Published in SPIE Proceedings Vol. 7739:
Modern Technologies in Space- and Ground-based Telescopes and Instrumentation
Eli Atad-Ettedgui; Dietrich Lemke, Editor(s)

© SPIE. Terms of Use
Back to Top