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Proceedings Paper

A new generalized differential image motion monitor
Author(s): Eric Aristidi; Yan Fanteï-Caujolle; Aziz Ziad; Cécile Dimur; Julien Chabé; Baptiste Roland
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Paper Abstract

We present first results of a new instrument, the Generalized Differential Image Motion Monitor (GDIMM), aiming at monitoring parameters of the optical turbulence (seeing, isoplanatic angle, coherence time and outer scale). GDIMM is based on a small telescope equipped with a 3-holes mask at its entrance pupil. The seeing is measured by the classical DIMM technique using two sub-pupils of the mask (6 cm diameter separated by a distance of 20 cm), the isoplanatic angle is estimated from scintillation through the third sub-pupil (its diameter is 10 cm, with a central obstruction of 4 cm). The coherence time is deduced from the temporal structure function of the angle of arrival (AA) fluctuations, thanks to the high-speed sampling rate of the camera. And the difference of the motion variances from sub-apertures of different diameters makes it possible to estimate the outer scale. GDIMM is a compact and portable instrument, and can be remotely controlled by an operator. We show in this paper the first results of test campaigns obtained in 2013 and 2014 at Nice observatory and the Plateau de Calern (France). Comparison with simultaneous data obtained with the Generalized Seeing Monitor (GSM) are also presented.

Paper Details

Date Published: 22 July 2014
PDF: 9 pages
Proc. SPIE 9145, Ground-based and Airborne Telescopes V, 91453G (22 July 2014); doi: 10.1117/12.2056201
Show Author Affiliations
Eric Aristidi, Lab. Lagrange, Observatoire de la Côte d'Azur, CNRS, Univ. of Nice Sophia-Antipolis (France)
Yan Fanteï-Caujolle, Lab. Lagrange, Observatoire de la Côte d'Azur, CNRS, Univ. of Nice Sophia-Antipolis (France)
Aziz Ziad, Lab. Lagrange, Observatoire de la Côte d'Azur, CNRS, Univ. of Nice Sophia-Antipolis (France)
Cécile Dimur, Lab. Lagrange, Observatoire de la Côte d'Azur, CNRS, Univ. of Nice Sophia-Antipolis (France)
Julien Chabé, Lab. Lagrange, Observatoire de la Côte d'Azur, CNRS, Univ. of Nice Sophia-Antipolis (France)
Baptiste Roland, Lab. Lagrange, Observatoire de la Côte d'Azur, CNRS, Univ. of Nice Sophia-Antipolis (France)


Published in SPIE Proceedings Vol. 9145:
Ground-based and Airborne Telescopes V
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

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