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Optical Engineering

Extended-image reconstruction through horizontal path turbulence using bispectral speckle interferometry
Author(s): Taylor W. Lawrence; J. Patrick Fitch; Dennis M. Goodman; Norbert A. Massie; Robert J. Sherwood; Erik M. Johansson
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Paper Abstract

Results are presented from a horizontal path imaging experiment in which a 0.5-m telescope was focused on targets located at a range of 1 .2 km. The targets varied in complexity from simple binary letters to extended representations of satellites with gray scale and size variations. Imaging at a center wavelength of 0.7 μm, we found an atmospheric degradation factor of D/r0 = 17, on average. We used a slow read-rate bare CCD detector and thus had to deal effectively 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 have shown that they can be adequately overcome. These results support the feasibility of high-resolution speckle imaging of high-earth-orbit satellites using CCDs.

Paper Details

Date Published: 1 March 1992
PDF: 10 pages
Opt. Eng. 31(3) doi: 10.1117/12.56083
Published in: Optical Engineering Volume 31, Issue 3
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
Robert J. Sherwood, Lawrence Livermore National Lab. (United States)
Erik M. Johansson, Lawrence Livermore National Lab. (United States)

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