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Proceedings Paper

Experimental validation of extended image reconstruction using bispectral speckle interferometry
Author(s): Taylor W. Lawrence; J. Patrick Fitch; Dennis M. Goodman; Norbert A. Massie; Robert J. Sherwood
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Paper Abstract

Results will be presented from a horizontal path imaging experiment in which we used a 0.5 meter telescope focused on a target located at a range of 1 .2 km. The targets included various extended objects from simple binary letters to extended representations of satellites with grey scale and size variations. Imaging at a center wavelength of 0.7 microns, we found an atmospheric degradation factor of Dir0 = 17, on average. We used a slow read-rate bare CCD detector and thus had to effectively deal with additive noise in the speckle measurements. Our image reconstruction algorithms are based on the use of the complex bispectrum and we have demonstrated diffraction-limited imaging down to light levels approaching a few photons per speckle per resolution area. We have paid careful attention to the effects of additive noise on the reconstruction process and shown that they can be adequately overcome.

Paper Details

Date Published: 1 August 1990
PDF: 16 pages
Proc. SPIE 1237, Amplitude and Intensity Spatial Interferometry, (1 August 1990); doi: 10.1117/12.19323
Show Author Affiliations
Taylor W. Lawrence, Lawrence Livermore National Lab. (United States)
J. Patrick Fitch, Lawrence Livermore National Lab. (United States)
Dennis M. Goodman, Lawrence Livermore National Lab. (United States)
Norbert A. Massie, Lawrence Livermore National Lab. (United States)
Robert J. Sherwood, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 1237:
Amplitude and Intensity Spatial Interferometry
James B. Breckinridge, Editor(s)

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