Bibcode
Castro, Javier; Bello, C. Delores; Jochum, Lotti; Devaney, Nicholas
Referencia bibliográfica
Proc. SPIE Vol. 3352, p. 386-399, Advanced Technology Optical/IR Telescopes VI, Larry M. Stepp; Ed.
Advertised on:
8
1998
Número de citas
5
Número de citas referidas
2
Descripción
The conceptual design of the Gran Telescopio Canarias (GTC) has been
completed. One of the challenges facing the GTC Project is to obtain
excellent image quality using a segmented primary mirror. The
segmentation will introduce a physical effect that contributes to
significant degradation of image quality. The image quality requirement
imposes the use of an active optical system to correct figure
instabilities of the optical surfaces and part of the unavoidable
fabrication figure errors. The active correlation includes the
capability of 5-axis motion of the secondary mirror, 3-axis motion of
each primary mirror segment, and 6 active degrees of freedom to deform
each segment. A mixed strategy of closed- and open-loop control of the
active correction will be implemented. This paper discusses the expected
wavefront errors of the GTC, how they are corrected by active optics,
and the expected image quality performance in FWHM, (theta) (subscript
80) and Central Intensity ratio.