Fast centroiding with a 24 x 24 frame transfer CCD

Hans J. Meyer; Phil J. Kruczkowski; William V. Schempp

doi:10.1117/12.148588

12 July 1993 Fast centroiding with a 24 x 24 frame transfer CCD

Hans J. Meyer, Phil J. Kruczkowski, William V. Schempp

Proceedings Volume 1900, Charge-Coupled Devices and Solid State Optical Sensors III; (1993) https://doi.org/10.1117/12.148588
Event: IS&T/SPIE's Symposium on Electronic Imaging: Science and Technology, 1993, San Jose, CA, United States

Abstract

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.

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Hans J. Meyer, Phil J. Kruczkowski, and William V. Schempp "Fast centroiding with a 24 x 24 frame transfer CCD", Proc. SPIE 1900, Charge-Coupled Devices and Solid State Optical Sensors III, (12 July 1993); https://doi.org/10.1117/12.148588

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KEYWORDS

Digital signal processing

Cameras

Telescopes

Charge-coupled devices

Signal processing

Stars

CCD cameras

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