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Proceedings Paper

The performance of the MROI fast tip-tilt correction system
Author(s): John Young; David Buscher; Martin Fisher; Christopher Haniff; Alexander Rea; Eugene Seneta; Xiaowei Sun; Donald Wilson; Allen Farris; Andres Olivares
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Paper Abstract

The fast tip-tilt (FTT) correction system for the Magdalena Ridge Observatory Interferometer (MROI) is being developed by the University of Cambridge. The design incorporates an EMCCD camera protected by a thermal enclosure, optical mounts with passive thermal compensation, and control software running under Xenomai real-time Linux. The complete FTT system is now undergoing laboratory testing prior to being installed on the first MROI unit telescope in the fall of 2014. We are following a twin-track approach to testing the closed-loop performance: tracking tip-tilt perturbations introduced by an actuated flat mirror in the laboratory, and undertaking end-to-end simulations that incorporate realistic higher-order atmospheric perturbations. We report test results that demonstrate (a) the high stability of the entire opto-mechanical system, realized with a completely passive design; and (b) the fast tip-tilt correction performance and limiting sensitivity. Our preliminary results in both areas are close to those needed to realise the ambitious stability and sensitivity goals of the MROI which aims to match the performance of current natural guide star adaptive optics systems.

Paper Details

Date Published: 24 July 2014
PDF: 15 pages
Proc. SPIE 9146, Optical and Infrared Interferometry IV, 91461Z (24 July 2014); doi: 10.1117/12.2056497
Show Author Affiliations
John Young, Univ. of Cambridge (United Kingdom)
David Buscher, Univ. of Cambridge (United Kingdom)
Martin Fisher, Univ. of Cambridge (United Kingdom)
Christopher Haniff, Univ. of Cambridge (United Kingdom)
Alexander Rea, Univ. of Cambridge (United Kingdom)
Eugene Seneta, Univ. of Cambridge (United Kingdom)
Xiaowei Sun, Univ. of Cambridge (United Kingdom)
Donald Wilson, Univ. of Cambridge (United Kingdom)
Allen Farris, Magdalena Ridge Observatory, New Mexico Institute of Mining and Technology (United States)
Andres Olivares, Magdalena Ridge Observatory, New Mexico Institute of Mining and Technology (United States)


Published in SPIE Proceedings Vol. 9146:
Optical and Infrared Interferometry IV
Jayadev K. Rajagopal; Michelle J. Creech-Eakman; Fabien Malbet, Editor(s)

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