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arXiv · 1904.07093

A generalized differential image motion monitor

E. Aristidi·A. Ziad·J. Chabe·Y. Fantei-Caujolle·C. Renaud·C. Giordano
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Abstract

We present the Generalised Differential Image Motion Monitor. It is a compact instrument dedicated to measure 4 parameters of the optical turbulence: seeing, isoplanatic angle, coherence time and wavefront coherence outer scale. GDIMM is based on a small telescope (28cm diameter) equipped with a 3-holes mask at its entrance pupil. The instrument is fully automatic, and performs continuous monitoring of turbulence parameters at the Calern Observatory (France). This paper gives a description of the instrument, data processing and error budget. We present also statistics of 3.5 years of monitoring of turbulence parameters above the Calern Observatory.

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E. Aristidi, A. Ziad, J. Chabe, Y. Fantei-Caujolle, C. Renaud, C. Giordano. 2019-04-15. A generalized differential image motion monitor. https://doi.org/10.1093/mnras%2Fstz854

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