Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...139..517p&link_type=abstract
Astronomy and Astrophysics, Vol.139, NO.2, P. 517, 1984
Astronomy and Astrophysics
Astrophysics
3
Scientific paper
A new technique of signal modulation fitted to a photoelectric astronomical instrument is described. It consists of a pseudo-noise grid generated from a Hadamar sequence of 0's and 1's. The transit time of the star is recovered performing the correlation between the recorded signal and a theoretical reference. This reference signal depends upon the speed of the star image in the direction perpendicular to the slits. This grid has the advantage of allowing the detection of a possible parasite star in the field. The fact that the slits are not of equal width permits to optimize the slit width very freely. In the case of the astrolabe, two images of the observed star are present in the focal plane. The instrument can work either with a periodic grid or with a pseudo-noise grid which allows the detection of the position of each image independently of the position of the grid in the focal plane. Unlike what happens with periodic grids, a great number of slits may be used and therefore the quality of the measurement will be improved. Finally, an example of signal obtained with the photoelectric astrolabe of CERGA, and the corresponding correlation function are presented. The grid used consists of 60 slits, with the narrowest covering 2".5 in the focal plane. To have a good determination with a periodic grid only eight slits can be used.
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