Mutual coherence propagation in turbulent media

Author

Monteiro, Anand C. ; Jarem, John M.

Author_Institution

Dept. of Electr. & Comput. Eng., Alabama Univ., Huntsville, AL, USA

fYear

1991

fDate

7-10 Apr 1991

Firstpage

796

Abstract

The differential equation governing the propagation of the mutual coherence function (MCF) in the frequency domain was solved by two techniques: an iterative method and a closed-form integrated method. The results from these two methods agree extremely well. It was necessary to split the MCF into two components: a delta component and a nondelta component. In free space, only the delta component is present and a point source images to a point if diffraction at a lens aperture is ignored. In a turbulent medium, the nondelta component Γ´_f is a significant factor. It grows in strength by absorbing energy from the delta component, until it reaches a maximum. Simultaneously, it also loses energy to the medium by scattering. After reaching a maximum Γ´_f gradually falls off. The delta component will still image to a point, with greatly diminished strength, while the Γ´ _f will contributed to fuzziness in the image

Keywords

differential equations; frequency-domain analysis; integral equations; iterative methods; light coherence; light propagation; light scattering; closed-form integrated method; delta component; differential equation; energy absorption; frequency domain; image fuzziness; iterative method; light propagation; light scattering; mutual coherence function; nondelta component; turbulent medium; Coherence; Degradation; Difference equations; Differential equations; Finite difference methods; Image analysis; Optical propagation; Partial differential equations; Quantum computing; Random media;

fLanguage

English

Publisher

ieee

Conference_Titel

Southeastcon '91., IEEE Proceedings of

Conference_Location

Williamsburg, VA

Print_ISBN

0-7803-0033-5

Type

conf

DOI

10.1109/SECON.1991.147868

Filename

147868