A generalized differential image motion monitor

Abstract We present a generalized differential image motion monitor (GDIMM). It is a compact instrument dedicated to the measurement of four parameters of optical turbulence: seeing, isoplanatic angle, coherence time and wavefront coherence outer scale. The GDIMM is based on a small telescope (28 cm...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2019-06, Vol.486 (1), p.915-925
Main Authors: Aristidi, E, Ziad, A, Chabé, J, Fantéi-Caujolle, Y, Renaud, C, Giordano, C
Format: Article
Language:English
Subjects:
Earth Sciences
Sciences of the Universe
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Summary:Abstract We present a generalized differential image motion monitor (GDIMM). It is a compact instrument dedicated to the measurement of four parameters of optical turbulence: seeing, isoplanatic angle, coherence time and wavefront coherence outer scale. The GDIMM is based on a small telescope (28 cm diameter) equipped with a three-hole 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 also present statistics of three and a half years of monitoring of turbulence parameters above the Calern Observatory.
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/stz854