Computer Science – Performance
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993spie.1900...91m&link_type=abstract
Proc. SPIE Vol. 1900, p. 91-96, Charge-Coupled Devices and Solid State Optical Sensors III, Morley M. Blouke; Ed.
Computer Science
Performance
Scientific paper
A fast centroid processor developed for telescope pointing and high speed tracking is described. It is based on a modified Photometrics CCD camera using a 24 X 24 pixel frame transfer CCD. The small CCD allows very fast update rates (200 frames per second with an 8 X 8 window). It provides good read noise performance (11 e- at 40 kHz read rate) and 16 bit data resolution. A self-adjusting algorithm accomplishes background subtraction. The centroid processor, based on a digital signal processor (Motorola 56001), calculates centroids in real time on 16 bit data to sub-pixel accuracy. The centroid values are converted to 16 bit data words which are used to drive the servos of a chopping secondary mirror on the 2.1 m telescope at Kitt Peak National Observatory. The mirror can track apparent star motion to provide low level (tip/tilt) adaptive correction of astronomical images. A factor of 5 improvement in Strehl ratio is theoretically possible at the 2.1 m telescope with tip/tilt correction. Preliminary results have yielded a factor of 2 Strehl ratio improvement.
Kruczkowski Phil J.
Meyer Hans J.
Schempp William V.
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