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Proceedings Paper

The MROI fast tip-tilt correction and target acquisition system
Author(s): John Young; David Buscher; Martin Fisher; Christopher Haniff; Alexander Rea; Eugene B. Seneta; Xiaowei Sun; Donald Wilson; Allen Farris; Andres Olivares; Robert Selina
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Paper Abstract

The fast tip-tilt correction system for the Magdalena Ridge Observatory Interferometer (MROI) is being designed and fabricated by the University of Cambridge. The design of the system is currently at an advanced stage and the performance of its critical subsystems has been verified in the laboratory. The system has been designed to meet a demanding set of specifications including satisfying all performance requirements in ambient temperatures down to -5 °C, maintaining the stability of the tip-tilt fiducial over a 5 °C temperature change without recourse to an optical reference, and a target acquisition mode with a 60” field-of-view. We describe the important technical features of the system, which uses an Andor electron-multiplying CCD camera protected by a thermal enclosure, a transmissive optical system with mounts incorporating passive thermal compensation, and custom control software running under Xenomai real-time Linux. We also report results from laboratory tests that demonstrate (a) the high stability of the custom optic mounts and (b) the low readout and compute latencies that will allow us to achieve a 40 Hz closed-loop bandwidth on bright targets.

Paper Details

Date Published: 12 September 2012
PDF: 15 pages
Proc. SPIE 8445, Optical and Infrared Interferometry III, 84451V (12 September 2012); doi: 10.1117/12.926316
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 B. Seneta, Cavendish Lab., Univ. of Cambridge (United Kingdom)
Xiaowei Sun, Cavendish Lab., Univ. of Cambridge (United Kingdom)
Donald Wilson, Cavendish Lab., 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)
Robert Selina, Magdalena Ridge Observatory, New Mexico Institute of Mining and Technology (United States)


Published in SPIE Proceedings Vol. 8445:
Optical and Infrared Interferometry III
Françoise Delplancke; Jayadev K. Rajagopal; Fabien Malbet, Editor(s)

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