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Proceedings Paper

The KPNO Digital Television Acquisition Processor
Author(s): Peter R. Vokac
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Paper Abstract

Sky limit performance of an intensified detector acquisition system is degraded by noise that significantly exceeds the minimum detectable signal level. A digital television acquisition processor has been developed at Kitt Peak National Observatory to attenuate the noise by frame-to-frame integration and to enhance the contrast through an arithmetic mapping function. Recent experience at the 4M Mayall Telescope indicates that the new real-time Digital Processor will extend the useful range of RCA ISIT detectors by four stellar magnitudes. During the course of project development two important design principles were rediscovered: 1) Integration will improve an image if and only if the detector system generates frame-to frame pixel differences. 2) When a pixel in a stable image is perturbed by frame-to-frame spectral noise, the effective sampling frequency cannot exceed the Nyquist sampling frequency of the most significant noise component. In other words, the maximum √N signal-to-noise improvement factor depends upon the frequency of the frame-to-frame noise, not upon the fastest possible readout frame rate.

Paper Details

Date Published: 3 May 1979
PDF: 9 pages
Proc. SPIE 0172, Instrumentation in Astronomy III, (3 May 1979); doi: 10.1117/12.957103
Show Author Affiliations
Peter R. Vokac, Kitt Peak National Observatory (United States)

Published in SPIE Proceedings Vol. 0172:
Instrumentation in Astronomy III
David L. Crawford, Editor(s)

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