A new generalized differential image motion monitor

Eric Aristidi; Yan Fanteï-Caujolle; Aziz Ziad; Cécile Dimur; Julien Chabé; Baptiste Roland

doi:10.1117/12.2056201

22 July 2014 A new generalized differential image motion monitor

Eric Aristidi, Yan Fanteï-Caujolle, Aziz Ziad, Cécile Dimur, Julien Chabé, Baptiste Roland

Proceedings Volume 9145, Ground-based and Airborne Telescopes V; 91453G (2014) https://doi.org/10.1117/12.2056201
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

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.

Citation Download Citation

Eric Aristidi, Yan Fanteï-Caujolle, Aziz Ziad, Cécile Dimur, Julien Chabé, and Baptiste Roland "A new generalized differential image motion monitor", Proc. SPIE 9145, Ground-based and Airborne Telescopes V, 91453G (22 July 2014); https://doi.org/10.1117/12.2056201

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