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Proceedings Paper

High-Resolution Astronomical Imaging By Triple Correlation Processing
Author(s): G. Weigelt
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Paper Abstract

The atmosphere of the earth restricts the resolution of conventional astrophotography to about 1 arcsec. Much higher resolution can be obtained by using speckle methods. The speckle masking method (triple correlation method) yields images of general astronomical objects with diffraction-limited resolution, for example, 0.03 arcsec resolution for a 3.6-m telescope. True images are obtained since speckle masking reconstructs both the modulus and the phase of the object Fourier transform. Therefore, speckle masking is a solution of the phase problem in speckle interferometry. The limiting magnitude of speckle masking is about 20m. Speckle spectroscopy is a speckle method that yields objective prism spectra with diffraction-limited angular resolution. Finally, speckle masking can recon-struct high-resolution images from optical long-baseline interferograms. A 1-km telescope array on the earth would yield images with 10 arcsec resolution. With a 40-km array in space a fantastic resolution of 10-6 arcsec can be achieved at λ-200 nm. We show speckle masking observations of NGC 3603 and Eta Carinae and computer simulations of optical aperture synthesis.

Paper Details

Date Published: 29 January 1988
PDF: 5 pages
Proc. SPIE 0828, Digital Image Recovery and Synthesis, (29 January 1988); doi: 10.1117/12.942072
Show Author Affiliations
G. Weigelt, Physikalisches Institut (Germany)

Published in SPIE Proceedings Vol. 0828:
Digital Image Recovery and Synthesis
Paul S. Idell, Editor(s)

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