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: http://www.mrao.cam.ac.uk/~bn204/phd_era/oof/oof.html
Дата изменения: Wed Jan 30 03:28:30 2002 Дата индексирования: Tue Oct 2 09:55:36 2012 Кодировка: Поисковые слова: star trail |
The map of surface errors (shown as
phase errors in radians) and the map of calcualated surface
illumination is shown in the following plot:
Phase
and illumination map
NEW: more detailed phase and
illumination map
Detailed Phase
and illumination map
Older Rx A scanning data These maps were taken at a wavelength of 1.3mm, and were produced by scanning the telescope across the sky. Only single differentiation (i.e. just the chopping motion) is needed, and the chop throw is fairly large.
An interesting feature of these data sets are the effects introduced by chopping of the secondary mirror: besides moving the two images from the centre of the map, it also introduces a coma term which flips sign between the two images. The size of the differential coma term is proportional to the chop throw, so these largo chop throw maps should make this effect significant. When we fitted for these effects we found good agreement between calculated and measured values for the differential coma term.
Bellow are the plots of actual measured data and the best model
fits for each defocus settings.
-2mm
defocus data and model maps
infocus data and model maps
+2mm defocus data and model maps
The map of surface errors (shown as phase errors in radians) and the
map of calcualated surface illumination is shown in the following plot:
Phase
and illumination map
The fitted and original maps are shown in the following plot:
Phase
and illumination map
These fits can be compared to fits by the old holography software.
