Other
Scientific paper
Mar 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011acasn..52..152z&link_type=abstract
Acta Astronomica Sinica, vol. 52, no.2 , p.152-159
Other
Telescopes, Instrumentation: Miscellaneous
Scientific paper
Profiting from photogrammetric measurements, the main-reflector panels of Delingha 13.7 m telescope are adjusted such that the main dish closes most to a perfect paraboloid at 52° elevation other than at zenith as before, and thus the overall efficiency of the antenna is optimized at different observing elevations. Observations show that the aperture efficiency has been increased to around two times as compared with before when the panels were adjusted on the basis of theodolite measurements. From the measurements at several different elevations, a set of gravity deformation models for the antenna can be drawn to describe the displacement and tilt angle of the sub-reflector as well as the focal length and surface deviation of the main dish over the entire range of elevation angles. The face-up and face-side gravity deformations, which are necessary for the gravity deformation model of the main dish, are usually derived by direct calculation from surface measurements at only three elevation angles. In this paper, however, they are achieved by least square fitting of the surface measurements at more elevations because by this means less measurement errors can be introduced into the model.
Fan H. Q.
Fan Shu-Hua
He Yu-Dong
Li Jiying
Li Yadong
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