Image Distortion And Compensation In The Presence Of Thermal Blooming

David A. Nahrstedt

doi:10.1117/12.935766

12 July 1983 Image Distortion And Compensation In The Presence Of Thermal Blooming

David A. Nahrstedt

Proceedings Volume 0410, Laser Beam Propagation in the Atmosphere; (1983) https://doi.org/10.1117/12.935766
Event: 1983 Technical Symposium East, 1983, Arlington, United States

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.*

Citation Download Citation

David A. Nahrstedt "Image Distortion And Compensation In The Presence Of Thermal Blooming", Proc. SPIE 0410, Laser Beam Propagation in the Atmosphere, (12 July 1983); https://doi.org/10.1117/12.935766

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