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Proceedings Paper

Optical Processor For The Very Large Array (VLA) Radiotelescope: System Concept
Author(s): I. Cindrich; C. C. Aleksoff; J. R. Fienup; L. E. Somers
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Paper Abstract

Optical Fourier transform processing of radiotelescope visibility function data is reviewed. Emphasis is placed on the aspects of the processor design that arise from the unusual characteristics of the data. The complex visibility function is available only over a partially filled aperture consisting of a set of elliptical paths. It is recorded at the input to the optical processor on a carrier frequency as a real nonnegative transmittance. Since a bipolar sky brightness function output is to be computed, the output of the optical Fourier transform channel is mixed with a reference beam and the difference is taken of two successive measurements differing in reference phase by 180°. Experimental results demonstrating processor concepts are shown and a processor system design approach is described.

Paper Details

Date Published: 22 August 1980
PDF: 17 pages
Proc. SPIE 0231, 1980 Intl Optical Computing Conf I, (22 August 1980); doi: 10.1117/12.958831
Show Author Affiliations
I. Cindrich, Environmental Research Institute of Michigan (United States)
C. C. Aleksoff, Environmental Research Institute of Michigan (United States)
J. R. Fienup, Environmental Research Institute of Michigan (United States)
L. E. Somers, Environmental Research Institute of Michigan (United States)


Published in SPIE Proceedings Vol. 0231:
1980 Intl Optical Computing Conf I
William T. Rhodes, Editor(s)

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