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Proceedings Paper

MEMS accelerometers in accurate mount positioning systems
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Paper Abstract

In order to attain precise, accurate and stateless positioning of telescope mounts we apply microelectromechanical accelerometer systems (also known as MEMS accelerometers). In common practice, feedback from the mount position is provided by electronic, optical or magneto-mechanical systems or via real-time astrometric solution based on the acquired images. Hence, MEMS-based systems are completely independent from these mechanisms. Our goal is to investigate the advantages and challenges of applying such devices and to reach the sub-arcminute range { that is well smaller than the field-of-view of conventional imaging telescope systems. We present how this sub-arcminute accuracy can be achieved with very cheap MEMS sensors. Basically, these sensors yield raw output within an accuracy of a few degrees. We show what kind of calibration procedures could exploit spherical and cylindrical constraints between accelerometer output channels in order to achieve the previously mentioned accuracy level. We also demonstrate how can our implementation be inserted in a telescope control system. Although this attainable precision is less than both the resolution of telescope mount drive mechanics and the accuracy of astrometric solutions, the independent nature of attitude determination could significantly increase the reliability of autonomous or remotely operated astronomical observations.

Paper Details

Date Published: 18 July 2014
PDF: 9 pages
Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 915162 (18 July 2014); doi: 10.1117/12.2064617
Show Author Affiliations
László Mészáros, MTA Research Ctr. for Astronomy and Earth Sciences (Hungary)
Eötvös Loránd Univ. (Hungary)
András Pál, MTA Research Ctr. for Astronomy and Earth Sciences (Hungary)
Eötvös Loránd Univ. (Hungary)
Attila Jaskó, MTA Research Ctr. for Astronomy and Earth Sciences (Hungary)


Published in SPIE Proceedings Vol. 9151:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation
Ramón Navarro; Colin R. Cunningham; Allison A. Barto, Editor(s)

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