Abstract
In this paper, we present the measurements that have been made to determine some of the parameters governing the transmission of a light wave through the atmosphere. Three parameters are studied: the parameter of Fried r0, the angle of isoplanatic θ0 and the external scale l0. The data for this purpose have acquired by a generalized differential image motion monitor. These data are used to measure the position and scintillation of a star on two windows. The device is composed of 3 sub-apertures instead of 2 two pupils of a diameter d = 6 cm, detached by a distance x0 = 20 cm horizontally. The difference between the variations of the position of the star in each window makes it possible to determine r0 and l0, while the variation in the window (3) makes it possible to obtain the scintillation used to calculate θ0. The data used dated from the night of October 24, 2016. A series of measures were performed at the Calern plateau in Nice–France. The series between 5:55 and 9:01 pm, with two focal lengths F = 6.11 m, the star have been observed is Vega. The measured wavelength was taken at 0.5 μm.
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