Optical processor for the very large array /VLA/ radiotelescope - Aberration analysis

Details Optical processor for the very large array /VLA/ radiotelescope - Aberration analysis Optical processor for the very large array /VLA/ radiotelescope - Aberration analysis

Jan 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980spie..231...55a&link_type=abstract

In: 1980 International Optical Computing Conference, Washington, DC, April 8-11, 1980, Proceedings. Book 1. (A81-37755 17-35) Be

Computer Science

Performance

Aberration, Antenna Arrays, Fourier Transformation, Optical Correction Procedure, Optical Data Processing, Radio Telescopes, Very Large Array (Vla), Computer Techniques, Digital Simulation, Error Correcting Devices, Lens Design, Light Scattering, Performance Prediction, Spherical Waves

Scientific paper

It is shown that an optical Fourier transform processor can convert VLA telescope visibility data at its input to a high accuracy ski-brightness map at its output. A particularly attractive Fourier transform processor that minimized the number of lens elements and hence potential background scattering sources is one for which the input is placed after the Fourier transform lens. This lens in its simplest form illuminates the input signal with a converging spherical wave. Such a system does not produce a perfect Fourier transform, but rather produces an aberrated one. The aberration is effectively analyzed as an error term within a Fourier transform integral. Error reduction techniques for the output map are described and numerical results from digital simulations are presented for the VLA A-array aperture.

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