G.S.M.: a Grating Scale Monitor for atmospheric turbulence measurements. I. The instrument and first results of angle of arrival measurements.

Details G.S.M.: a Grating Scale Monitor for atmospheric turbulence measurements. I. The instrument and first results of angle of arrival measurements. G.S.M.: a Grating Scale Monitor for atmospheric turbulence measurements. I. The instrument and first results of angle of arrival measurements.

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26as..108..173m&link_type=abstract

Astronomy and Astrophysics Suppl. 108, 173-180 (1994)

Astronomy and Astrophysics

Astrophysics

31

Atmospheric Effects, Turbulence, Site Testing, Technique: Interferometric, Instrumentation: Miscellaneous

Scientific paper

A better understanding of the behavior of wavefronts perturbed by the atmospheric turbulence is vital for the progress in the High Angular Resolution (H.A.R) observing techniques, namely long baseline interferometry and adaptive optics. A new instrument called G.S.M. was built for the study of spatial and temporal properties of wavefronts by means of angle of arrival fluctuation measurements in two (or more) spatially separated points. The Fried parameter r_o_, the wavefront outer scale L_0_ and the speckle lifetime τ can be deduced from these data. In the first part of this paper the instrument itself is described. It is based on the modulation of a stellar image formed in a small telescope by a Ronchi grating together with a fast scanning mirror. High sampling rate (up to 5 ms), high precision (rms photon noise 0.08" on α UMi) and the possibility to have long uninterrupted data sequence are achieved. Examples of the first results include r_o_ and τ estimates.

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