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Proceedings Paper

Image Distortion And Compensation In The Presence Of Thermal Blooming
Author(s): David A. Nahrstedt
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Paper Abstract

The first portion of this paper addresses the impact of thermal blooming in viewing extended target images. Topics discussed include the nature of the degradation and how images are modeled based on principles of incoherent imaging and anisoplanatism. Characteristics of images for several realistic scenarios are discussed, quantitatively, in the context of parameters normally associated with the forward propagation, only. The wave optics approach used in the simulation is shown to agree with published experimental results. The second portion of the discussion deals with image compensation in correcting for the effects of blooming. Such compensation is achieved by simulating a multiple thermal source, low bandwidth, return wave adaptive optics system. Incoherent point spread functions are corrected through various Zernike modes based on information from the closed loop optimization. Each spread function, corresponding to an isoplanatic region, is convolved with the appropriate object field to reconstruct the improved, extended image. Residual image distortion, degradation in peak irradiance, and adaptive optics loop stability is discussed for several examples, with respect to degree of correction and wavelength sensitivity.*

Paper Details

Date Published: 12 July 1983
PDF: 11 pages
Proc. SPIE 0410, Laser Beam Propagation in the Atmosphere, (12 July 1983); doi: 10.1117/12.935766
Show Author Affiliations
David A. Nahrstedt, Air Force Weapons Laboratory/ARLB (United States)

Published in SPIE Proceedings Vol. 0410:
Laser Beam Propagation in the Atmosphere
John Carl Leader, Editor(s)

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