Extended-image reconstruction through horizontal path turbulence using bispectral speckle interferometry

Results will be presented from a horizontal path imaging experiment in which a 0.5 meter telescope is used to focus on a target located at a range of 1.2 km. The targets included various extended objects from a simple binary letters to extended representations of satellites with grey scale and size...

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Bibliographic Details
Published in:Optical Engineering 1992-03, Vol.31 (3), p.627-636
Main Authors: Lawrence, Taylor W, Fitch, J. Patrick, Goodman, Dennis M, Massie, Norbert A, Sherwood, Robert J, Johansson, Erik M
Format: Article
Language:English
Subjects:
440600 - Optical Instrumentation- (1990-)
ALGORITHMS
BOSONS
CHARGE-COUPLED DEVICES
COHERENT SCATTERING
DIFFRACTION
EARTH ATMOSPHERE
ELEMENTARY PARTICLES
Exact sciences and technology
EXPERIMENT PLANNING
FEASIBILITY STUDIES
FOCUSING
Fundamental areas of phenomenology (including applications)
IMAGE PROCESSING
Imaging and optical processing
INHIBITION
INTERFEROMETRY
MASSLESS PARTICLES
MATHEMATICAL LOGIC
Optics
OTHER INSTRUMENTATION
PHOTONS
Physics
PLANNING
PROCESSING
RESOLUTION
SATELLITES
SCATTERING
SEMICONDUCTOR DEVICES
SIGNAL-TO-NOISE RATIO
TARGETS
TELESCOPES
TURBULENCE
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Description
Summary:Results will be presented from a horizontal path imaging experiment in which a 0.5 meter telescope is used to focus on a target located at a range of 1.2 km. The targets included various extended objects from a simple binary letters to extended representations of satellites with grey scale and size variations. Imaging at a center wavelength of 0.7 micron, an atmospheric degradation factor of D/r (sub 0) = 17, on average was found. A slow read-rate bare CCD detector was used to effectively deal with additive noise in the speckle measurements. The image reconstruction algorithms are based on the use of the complex bispectrum and diffraction-limited imaging was demonstrated down to light levels approaching a few photons per speckle resolution area. Careful attention was paid to the effects of additive noise on the reconstruction process and it was shown that they can be adequately overcome. (Author)
ISSN:0091-3286
1560-2303
DOI:10.1117/12.56083